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How to use charles proxy

How to use charles proxy

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how to use charles proxy

When you use Charles as the internal proxy server for web debugging purpose, you can find localhost or 127.0.0.1 in the Structure panel of the proxy. Setup Proxy · Open Charles. The first time you launch Charles, you will be asked to grant privileges to change your Network Settings. · Enable. Here at Detroit Labs we use Charles Proxy to debug and test our In this tutorial, we will explain the first option for iOS simulators.

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Developer's Toolbox: What is Charles and why would I want it?

How to use charles proxy -

Charles Proxy

Proxy server application

Charles Web Debugging Proxy is a cross-platform HTTP debugging proxy server application written in Java. It enables the user to view HTTP, HTTPS, HTTP/2[3] and enabled TCP port traffic accessed from, to, or via the local computer. This includes requests and responses including HTTP headers and metadata (e.g. cookies, caching and encoding information) with functionality targeted at assisting developers analyze connections and messaging.

Features[edit]

  • Network message analysis – Charles shows full messaging sources of all HTTP and similar TCP-based communications that pass via its proxy port.
  • XML, JSON, SOAP interpretation – structured viewers that translate the raw HTTP content into a tree format for analysis.
  • HTML, CSS, JavaScript viewers – providing marked-up/formatted/unminified text content display
  • SSL debugging – allowing decryption of encrypted data to review/troubleshoot the transmitted content.
  • Bandwidth throttling – to simulate slower internet speeds by slowing down bandwidth/speed and introducing latency, for example to simulate a slower 3G connection.
  • Flash development aids – including Action Message Format (AMF) content analysis.
  • Debugging HTTP connections from mobile devices – providing a proxy between an iOS[4] or Android[5] device and a remote site, to debug HTTP connections and behavior that only occur on devices, including debugging video streaming issues, airplay issues, etc. that cannot be tested in the iOS simulator.
  • Remote file debugging – ability to swap out a remote file for a local file to aid debugging a remote site without requiring access to the server files.[6]
  • Debugging aids – such as repeating URL post requests to test server changes, adding breakpoints, or editing request variables.
  • Validation function – ability to right-click any proxy request, and provide validation feedback using the W3C Markup Validation Service, useful for content the W3C service otherwise cannot access directly.

Browser support[edit]

Charles will autoconfigure for use on the following browsers:

  • IE (Windows system proxy settings)
  • Chrome
  • Firefox
  • Safari (Mac OS X or Windows system proxy settings)

See also[edit]

References[edit]

External links[edit]

Источник: https://en.wikipedia.org/wiki/Charles_Proxy

How to Record Logs with Charles Proxy on Windows

We have already published the post about capturing browser logsfor finding out the errors on any website or web application. In this post, you will learn about another method of collecting logsfor getting fixed the errors found on any website or web application. It will be easier to find out the fault if you are able to see what is being sent and received by your web browser. There is a cross-platform application called Charles Proxy that will record all the traffic that is sent and received between the client and server.It will make easy to see and troubleshoot the issues that are generated while testing the software. This software is freely available although the free version does not run more than 3o minutes at a time. It also included with most advanced features such as viewing SSL requesting plain text, simulating slower internet connections and viewing XMLand JSONrequests and responses. This software is available for all of the available OS such as Windows, Mac, and Linux. In this post we are going to explain in detail about installing, setting up and recording the logs through Charles proxy on windows only.

Installing Charles Proxy on Windows

Use the following steps to install Charles proxy on windows.

  1. At first, go to the download page of the Charles proxy website from here.
  2. Download any of the MSI files for your 32 or 64-bit windows.
  3. Open the installation file and click on Next when the dialog box appears.
  4. Accept the terms in the License Agreement and go next.INSTALLING CHARLES PROXY ON WINDOWS
  5. Choose the required folder for installation of the application.INSTALLING CHARLES PROXY ON WINDOWS
  6. Now, click on Install to begin installing.INSTALLING CHARLES PROXY ON WINDOWS

Setting up the Application for Recording Logs

Now, you have to set up the application for recording logs.

  1. Go to proxy menu and click on windows proxy or press Ctrl+Shift+P.
  2. Now, go to help menu, click on SSL proxying and then click on Install Charles root certificate.
  3. Click on Install certificate button located under the general tab.
  4. Choose the store location “current user” and click next.
  5. Choose the second option “Place all certificates in the following store” and click on Browser button.
  6. Select “Trusted Root Certification Authorities” and go next to complete the wizard.
  7. Now, click on Yes when confirmation message appears.
  8. Click on OK until the certificate dialog box closes.
  9. To verify the certificate after successfully installed, open certificate dialog box as mentioned in step 2.Setting up the Application for Recording Logs
  10. Go to the certification path tab and observe the certificate status “This certificate is OK”.
  11. To enable SSL proxy for SSL enabled web applications, go to the proxy menu and click on SSL Proxying settings.
  12. Click on Add button and enter the name of the domain or port number. Where domain name can be used with * symbol and the port number. For the websites with SSL certificate, the port number will be 443.SSL Proxying settings
  13. Click on OK to close the dialog box.

Recording Logs with Charles Proxy

  1. When all the setup completes, go to file menu, click on the New session and click on start recording.
  2. You will see the blue circle on the website link while recording the log.Recording Logs with Charles Proxy
  3. Click on the stop to stop the recording
  4. To save recorded log, go to file menu and click on save.

Removing Installed Root Certificate

Use the following steps if you want to remove Installed Root certificate after recording log.
  1. Search “certmgr.msc” from windows search and press enter.
  2. Open “Trusted Root Certification Authorities” folder and click on certificates.Removing Charles Proxy Certificate
  3. Search for  Charles Proxy certificate and delete it.
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Shuseel Baral

Shuseel Baral is a web programmer and the founder of InfoTechSite has over 8 years of experience in software development, internet, SEO, blogging and marketing digital products and services is passionate about exceeding your expectations.

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Источник: https://www.siteforinfotech.com/record-logs-charles-proxy-windows/

How to use Charles Proxy for debugging applications?

How do you track the traffic between your program and a web server? Using Charles proxy, of course! It allows developers of client/server solutions to check if the app they are building has any issues when connecting to the remote sources of data (videos, files, databases). Using the program, one can easily check:

  • how an app behaves with large or small volumes of data;
  • transferred data’s format;
  • requests, responses, and their parameters;
  • the way servers process bad requests and the app processes bad responses;
  • how the app processes errors, etc.

Essentially, Charles allows users to oversee data transmitted between their computer and a certain server, which, under normal circumstances, remains hidden from the users. Programmers and webmasters can use this data to improve the performance of their sites. For regular users, leveraging a proxy can be a decent way to familiarize themselves with the main principles of the Internet’s functioning.

Installation and the first launch

Everything starts with downloading a setup file from the official website. The free trial lasts for 30 days, after which a 30-minute time restriction on a single session will be imposed. To resume your work, you’ll need to restart the app every time it shuts down. If the need for longer sessions arises, you’ll have to purchase the app to continue using it without any limitations. Follow the installation procedure and launch the app.

During the first launch, the program will offer to adjust your network settings so that they could work with it properly. Click Grant Privileges and wait for the app’s interface to load. It is an important step; if it is missed, the app that is being tested won’t be able to use intermediary services offered by Charles.

Charles works perfectly with most modern browsers, both desktop and mobile. The setup procedure, however, may vary from one system to another. To let the software configure automatically, Edge, Chrome, and Safari users don’t have to perform any additional actions after installing the app. Firefox users will need to install a special add-on to ensure that Charles proxy launches automatically along with the browser.

Launching the program on mobiles

Mind that your mobile device and the computer with the debugger proxy must be connected to the same network. Windows and macOS devices perform all necessary configurations automatically, while mobile devices require manual setup. You don’t need to set the program’s running port by hand; its predetermined value is 8888. However, you’ll need to change the proxy setting of your mobile device (from Off to Manual).

Configuring an iOS device

As mentioned earlier, setting up Charles proxy on IOS is fairly simple: just locate the current network in Settings and change its proxy setting from Off to Manual. Your device will then ask to input the server’s IP, which should be identical to that of your PC. Mind that you’ll need to turn off Charles manually every time you finish using it.

As soon as you start using your iPhone, the proxy will ask you to approve the connection. After that, your mobile device and its IP-address will get on the Access Control list of the proxy.

If you are planning to test your app with an iOS emulator, it should connect to Charles automatically. If it fails to do so, try restarting it or set the proxy as the system one in your macOS.

Configuring your Android device

Not all Android devices have the setting for HTTP proxy. If your phone/tablet does, just follow the procedure that is rather similar to the one described in the iOS configuration: change the name of the proxy to the IP-address of your computer with Charles, and change the port to 8888.

In order to use an Android emulator, add an additional command line in it and type: http-proxy http://LOCAL_IP (this is your computer’s IP-address):8888.

Regardless of the mobile device you use, don’t forget to switch the HTTP proxy off after you finish using it. If you fail to do so, your apps will show network failures.

Working with SSL-Encrypted websites

Mind that Charles won’t work with HTTPS-protected websites without Charles root certificates. They must be installed by hand, through going to Help>SSL Proxying. Within this menu, you should see a dedicated button for installing the needed certificates. The process will be completed automatically (yet mind that you’ll need to set the certificates’ status to “trusted” in your browser). Fortunately, this process is rather simple:

On a Windows computer (to be used with IE or Edge)

  • When you see the message that your certificate is not trusted, click on Install Certificate. Certificate Import Wizard will be launched.
  • Import it into Trusted Root Certification Authorities and override the automatic selection.
  • Finish working with the wizard.
  • Restart the browser if needed.

Using Firefox

  • Make sure that the browser is connected to Charles.
  • Open https://chls.pro/ssl in Firefox. The browser will show a certificate import dialog. Choose “Trust this CA to identify websites” to finish the import.

Using Chrome

  • First, you’ll need to save Charles root certificate as a Binary Certificate (.cer). This can be done in Charles’ Help menu, by clicking on the SSL Proxying tab.
  • Go to Advanced Settings in Chrome and click “Manage certificates.”
  • Import your newly saved certificate by clicking on the “Trusted Root Certification Authorities” tab.
  • After you finish the procedure, all certificates signed by Charles will be automatically trusted by Chrome.

On macOS

  • Launch Keychain and find Charles among the available options.
  • Click on the certificate to open a panel and choose Trust.
  • In the drop-down menu, select Always Trust and click OK.

After completing the above steps, you should have a ready-to-work setup. On the left side of the program’s interface, you will see the Structure/Sequence tree, where all the connections will appear. By clicking on them, you can see the requests that your app is making to domains. In the field on the right, all the request configurations and details will be shown.

If you need to collect data for future analysis, press the Recording button at the top. If you are interested in a specific domain, right-click on it and select Focus. This will hide all other domains under the Other Hosts group.

Installing Charles SSL certificate on mobile platforms

For IOS users, the process is rather simple. The SSL certificate can be installed only upon the HTTP proxy setup. To receive the SSL certificate, follow the link. Give your permission to install the certificate and use the proxy without any limitations.

Android users will face more difficulties, as they need to configure every particular app to trust Charles for making the whole thing work. To do this, add the Network Security Configuration File to the application. This file will make your app trust certificates installed by Charles.

Using Charles to modify Requests/Responses: Rewrite tool

When you can clearly see all requests to a necessary domain, you can try and modify them in order to find possible issues with your app or website. For example, you can try and change any parameter in the headers or the body of a request and check what response the server is going to give. You can also send a correct request but change the response to see how your app processes faulty responses. All of this can be done with the help of the Rewrite tool that is used exactly for that: modifying requests or responses.

Go to Tools>Rewrite>Enable Rewrite to be able to use it with any domain. When you click on the domain name, you will observe the Rewrite button in the bottom right corner. Click on it to add your location and rule. In the dialog window that appears, click Add and type * to process all the requests or a specific URL and path. In the rule field, click Add and:

  • Select the type of rule you want to create in the drop-down menu.
  • Check either Request or Response to specify where the rule will be applied.
  • Use Match fields to write what request/response you will be working with or leave them blank to process all of them.
  • Use Replace fields to enter either the name or the value of the rule you will modify.

What makes Charles Proxy stand out from similar propositions?

The software has many notable advantages over its competitors. First, there is a significant trial period, which allows users to gain a comprehensive view of the app’s potential. Charles proxy works with most operating systems and browsers available today, making it an ultimate solution for anyone. The whole system is fairly easy to use, especially if you aren’t planning to work with SSL encrypted websites (which, however, can hardly be a case in 2020).

Conclusion

When testing an app or website, checking its usability is not the only way to see if there are bugs and issues. To fully understand and eliminate possible issues with the network connections, using Charles or a similar tool for debugging is crucial. We recommend Charles because it can be installed within minutes, provides a significant number of useful features, and works on a wide variety of platforms.

Источник: https://exyte.com/blog/how-to-use-charles-proxy-for-debugging-applications

Capturing network traffic is a useful method for debugging any application. Using a network proxy like Charles makes it very easy to see the data that your app is sending/recieving. This post will cover the steps to setup an iOS device to use Charles as a proxy.

More recently, I’ve found Proxyman to be an easier tool to setup and use compared to Charles.

🛠 Configure Charles

We’ll need to specify some initial configuration settings for Charles before we start capturing traffic.

  1. Verify the port that Charles can listen on. Default is . From the Menu go to Proxy then Proxy Settings. In the Proxies tab you’ll find the port #.
  2. Enable SSL Proxying. From the menu go to Proxy then SSL Proxying Settings. In the SSL Proxying tab make sure SSL Proxying is enabled. Also add a wildcard entry to capture everything for now. This can be changed later to filter out certain domains depending on what traffic you want to see. ssl_proxying
  3. Get the IP address. From the menu go to Help then SSL Proxying then Install Root Certificate on Mobile Device or Remote Browser. Make note of your computer’s IP address and port. ip_port
  4. Start the proxy if it didn’t autostart.

📱 Configure iPhone to use Proxy

Since I’m using an iPhone for this tutorial, these instruction will be specific to iOS. However similar steps will also work for Android.

  1. Connect to the proxy by configuring the Wi-Fi connection on the iPhone to use Charles. From the Settings Menu go to Wi-Fi, then tap the little next to the network you’re connect too. Then tap then Manual and add the IP and port from the previous steps.

  2. Accept prompt that pops up in Charles. You’ll know that a conection has started if you see this prompt.

  3. While connected to the proxy, download and install charles root certificate on the iPhone. After going to this url chls.pro/ssl, follow all the prompts to download and install the cert.

  4. Enable the root cert by going to Settings, General, About, sroll to the bottom and tap Certificate Trust Settings. Enable the toggle for the root cert on that page.

manual_proxyinstall_certenable_cert

Notes

iOS bug saving manual proxy configuration. If this happens, just forget the network and re-add it. I noticed this behavior on iOS 12.3.1.

This setup was all done with devices on the same LAN through Wi-Fi. I can’t speak for other configurations.

SSL Pinning

Some apps implement SSL certificate pinning which means they specifically validate the root certificate. Because the app is itself verifying the root certificate it will not accept Charles’s certificate and will fail the connection. If you have successfully installed the Charles root SSL certificate and can browse SSL websites using SSL Proxying in Safari, but an app fails, then SSL Pinning is probably the issue.

Источник: http://johnborg.es/2019/07/charles-proxy-with-device.html

How to use Charles Proxy to rewrite HTTPS traffic for web applications

Posted by Tom Sabin on

Charles Proxy is an application that sits between your computer and the Internet to record HTTP(S) traffic. Most importantly for me, it has the ability to also modify a server’s HTTP response. I’ve been using Charles over the past few weeks to rewrite responses from our APIs and I’ve been slowly learning what Charles is capable of but also what it isn’t. Needless to say, there’s still a lot to learn, but the defining moment for me was when I was able to recreate a production bug, by replaying the JSON payloads to my local development server causing the same error to be raised.

When I first started using Charles Proxy, I was quite overwhelmed by the UI and how everything fitted together. This blog post will help you demystify the application, setup to inspect HTTPS traffic and demonstrate how to use Charles to rewrite requests and responses in three different ways.

For clarity, all examples in this post use Charles Proxy v4.2.7 for macOS Mojave.

Inspecting HTTPS traffic

If you haven’t already, I’d suggest downloading Charles and installing the app to follow along.

On the first boot you’ll be prompted with a dialog to automatically configure your network settings. You’ll need to Grant Privileges for Charles to work correctly.

Grant Privileges to Automatic macOS Proxy Configuration dialog

Once granted, the main interface will open and there will likely be a flurry of activity that shows up in the Structure view. This list will quickly become full of different domains, so you can Focus on specific ones by right clicking to only show focused domains. Alternatively, use the Filter search input found on the bottom left of the window.

Try reloading this page and you’ll notice that for HTTPS requests, all resources will show as <unknown>.

Encrpyted content

Fear not, for it is quite simple to install the Charles Root Certificate and configure individual URLs so that you can inspect the page’s contents.

Decrypted content

To get to this point, you’ll need to install the Charles Root Certificate. For macOS find Install Charles Root Certificate from Help → SSL Proxying in the menu bar to add the certificate to Keychain Access.

Add certification from Help item

If it doesn’t pop up, and only opens Keychain Access it’s likely you’ve installed it in the past - you should be able to find it by searching for Charles (just make sure you’ve got All Items selected before searching).

Once you’ve added the certificate, you need to double click to open the certificate window and change the Trust settings to Always Trust. Close the window to save.

Trusting certificate from Keychain Access

The last step is to configure a URL so that you can inspect the domain’s traffic. If this isn’t configured for the URL then you’ll see SSL Proxying not enabled for this host in the Notes row of the Overview panel as shown below.

Notes row suggesting what to do next

As the note suggests, you’ll need to find SSL Proxying Settings from Proxy in the menu bar. Add the full domain (e.g. ) or make use of wildcards. Just avoid making an entry of only (wildcard): that will definitely start breaking all sorts of things unexpectedly.

You should now start to see the HTTPS traffic for that domain, try refreshing the browser page and you’ll notice as well that the icon next the domain has changed to a lightning bolt to show that SSL Proxying enabled for this host.

Rewriting traffic with Breakpoints

Now that we can inspect both HTTP and HTTPS traffic, we can start rewriting responses. The quickest way to achieve this is to use a Breakpoint. These are set up for specific resources (or Locations as they’re called in Charles Proxy) and will pause the response for us to modify before it reaches the client.

You can right click on any level of the resource tree structure to create a breakpoint.

Create breakpoint from right click

Without any dialogs or notification, this creates a Request & Response breakpoint. You can see the entry (and future ones) from Breakpoint Settings found in the Proxy menu bar item. If you don’t want to pause for requests (I have never needed this), you can configure the breakpoint to be only for responses - double click on the breakpoint entry and uncheck Request.

Edit Breakpoint dialog to uncheck Request option

The next time you make a request that matches the URL, Charles will show a new tab listing the responses and/or requests queued up. This queue can quickly become overwhelming if your matcher is too greedy, shows both requests and responses or that the site is making regular poll requests. The Status row will be helpful in determining what’s going.

Breakpoint tab with paused response

From within this tab, you can edit everything about the response: headers, cookies, JSON/HTML, etc. using the Edit Response subtab. Try changing the page’s response body using the different views available.

After you’ve edited something, you have a choice of actions to take:

  • Execute applies the changes and allow the response to reach its destination,
  • Cancel discards your changes but continues to send the response,
  • Abort kills the response, simulating a network failure.

Altered HTML in browser

Rewriting traffic with the Rewrite tool

Breakpoints are a quick way to rewrite payloads and modify status codes, but it becomes time consuming for responses you want to modify the same way each time. Thankfully, Charles has other features to make this easier. One of them is called Rewrite and they can be used to modify almost everything about the request and/or response, without interuption and for each time they’re made.

We’ll use a Rewrite to modify the JSON body from https://reqres.in/api/users/1 (actual response shown below). Remember to setup a SSL Proxying setting for this new host.

First, copy the full URL of the endpoint and navigate to Rewrite from the Tools menu bar item. Enable Rewrite setting and add a new set. Then add a Location (URL) that defines the set. Paste the URL to the Host field and hit Tab ⇥ to auto deconstruct the URL into the relevant fields.

Create a Rewrite by pasting into the Host field

Now we can add a Rewrite Rule to change the JSON response body to .

Rewrite response body with JSON value

The Match regex used here is optional for this particular example, but you may find it useful in the future to target only JSON-like responses. You may want to use this if you have CORS preflight requests that you don’t want to modify. Thanks to Austin on Stackoverflow for this workaround.

After the Rewrite Rule has been added, be sure to Apply the changes and make the request again. If you’ve used a browser to make these requests, you may need to force reload or disable cache. For our cURL output, we now have our modified response instead of the original:

In the Overview tab you’ll see a new row for Notes with so you’ll know when your rewrites are working correctly and or when they might not be correctly configured.

Notes row showing body has been altered

Rewriting traffic with Map Local

Another option you have to rewrite responses (and arguably the easiest one to manage) is Map Local. You’ll find this in both the Tools menu bar item and also at the bottom of the list when right clicking on a domain in the resource list. Let’s use the same example as before (https://reqres.in/api/users/1) to try it out.

If you’re rewriting different paths and resources, the most flexible way of setting up a Mapping is to copy the path structure as folders. For our example above, we’d need a folder for each path segment and a file for the final resource that’ll contain our JSON response:

Next, when creating the Mapping, keep the Path field blank and set the Local path to to represent the site.

The next time the request is made, it’ll match the URL paths to our newly created directory structure and respond with the contents of the file.

Once again, you can verify that this is working if you take a look in the Overview tab and specifically the Notes row: .

Map Local setup with matching directory structure

I’d love for us to be using this in our development workflow, but unfortunately the Mapping cannot be filtered by HTTP method, which causes all sorts of troubles for OPTIONS requests (used for CORS preflight requests). The preflight request matches the URL and therefore the response is rewritten and causes a bunch of browser errors, including:

Access to fetch at ‘[url]’ from origin has been blocked by CORS policy: Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. If an opaque response serves your needs, set the request’s mode to ‘no-cors’ to fetch the resource with CORS disabled.

We’ve had to settle with using Rewrites instead, targeting responses that already have a JSON body, so we know Charles is not modifying the CORS response. For now, the workaround (matching the body to ) is working, but it’s definitely not as easy as using Map Local.

Future thoughts

When it comes to local development, Charles has become an invaluable tool to rewrite the API responses without the need to hack around the application code. However, keep in mind that this has been within the context of client side JavaScript making the requests. Some frontend web applications that we work on are backed by a Next.js server that also provides server side rendering. This server will also make requests to the same APIs, which currently show in Charles Proxy still as <unknown>. It seems that the process that is running the Node server isn’t using the web proxy that Charles’ automatically set up in my System Preferences from first application load. There’s likely a few more hoops that I need to jump through to configure the local server correctly.

I hope that future versions of Charles Proxy will support matching URLs also by HTTP methods not just for Breakpoints, as it’ll open the doors to using Map Local more often but also to not need workarounds for the Rewrite tool. But for now, those workarounds are working for us.


About Tom Sabin

A picture of Tom Sabin

My career in web development started in 2012 as a Ruby on Rails developer. Recently, I’ve moved up the stack to delve further into JavaScript, and specifically React.

Outside of work, you’ll find me climbing walls at Building One+ or VauxWall East.

You can also find me on Twitter as @tomsabin

Источник: https://deliveroo.engineering/2018/12/04/how-to-use-charles-proxy-to-rewrite-https-traffic-for-web-applications.html

Charles Proxy in Android emulator

In this article, we will discuss about how to capture the traffic of our Android application using a tool called Charles Proxy. I recommend you continue reading, you will love it! At least we love here at Apiumhub.  

Developing a Web application is immediately viewing and analyzing all HTTP requests that are made. Client requests and server responses are easily traceable and reproducible. Instead, when you are working with a mobile device, both physical and virtual, the analysis of this traffic is not as trivial.

Therefore we will present a tool that is very useful, as much in the case covered in this article, as in many others, Charles Proxy.

This tool can be used to monitor all HTTP and HTTPS traffic, using for it certificates that the Proxy itself provides us, with a duration of 24 hours.

 

SETUP CHARLES PROXY

First of all we will configure our Charles Proxy. To do this, let’s Proxy in the menu and follow those steps:

 

  • Proxy > Proxy Settings: We leave the port as default and activate “Enable transparent HTTP Proxying”

charles proxy

 

  • Proxy > lL Proxy Settings: Activate “Enable SSL Proxying” and we add a new entry in Locations (Host: *, Port: *)

 

Charles proxy

 

HOW TO SET UP ANDROID EMULATOR

 

Once we set up Charles Proxy, we are going to set up our Android emulator. For that, when the time of launching it arrives, we will need to pass the IP of our Charles Proxy as an environment variable (in Charles Proxy: Help > Local IP Address), with something similar to the following command:

emulator -netdelay none -netspeed full -avd <emulador> -http-proxy http://<ip-proxy>:8888


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(If we have changed the port for another when we had to set up the Charles, we also have to change the port value)

Once the emulator is opened, we will install the certificate that gives us Charles Proxy by opening from our mobile browser this url. A dialog will automatically appear to install a new certificate on mobile as shown in the following picture: 

 

Charles proxy

 

It should be enough by putting a name and accepting the installation. Once all these steps are done, we go to Charlesproxy and click on the button “Start Recording” (Or also, from Proxy > Start Recording) and from now you will have any HTTP/HTTPS traffic exiting from the mobile. I leave you with a screenshot of the final result:

 

charles proxy

 

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If you enjoyed reading this article about Charles Proxy, you might like…

 

 

Before I leave you, I would just like to mention that if you’re looking for a new job opportunity as a software developer, you should definitely have a look at our job vacancies.

 

Источник: https://apiumhub.com/tech-blog-barcelona/charles-proxy-android-emulator/
how to use charles proxy

Inspecting traffic is very valuable for debugging and troubleshooting. Let’s assume that your application calls to and receives unexpected data. Want to view actual request and/or response headers and body? Charles proxy can receive traffic from the application and send it to the target server: while capturing all information.

Quick and simple approach described below will let capture your NodeJS application traffic: both HTTP and SSL / HTTPS. No additional dependencies required: only Charles proxy.

Configuring Charles:
  1. Go to Proxy » Reverse Proxies…
  2. Check Enable Reverse Proxies, add a target server:
    - any unused local port
    - target host address
    - target host port
  1. Go to Proxy » SSL Proxying Settings… » SSL Proxying tab
  2. Check Enable SSL Proxying, add a target server:


Configuring NodeJS application:
  1. Change requests options to point to Charles proxy instead of :

    - local port from reverse proxy settings
  2. Charles uses self-generated SSL certificates, so to prevent certificate errors add following line:

Done! Enjoy debugging.

You could apply the rules only for debugging or development environment, for example with environment variable.

Charles proxy version used: v 3.10.1. It was tested on Mac OS and should work on Linux and Windows as well. You could also use free Fiddler proxy on PC.

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Источник: http://marianna.im/tech/capture-nodejs-traffic-with-charles/

Capturing network traffic is a useful method for debugging any application. Using a network proxy like Charles makes it very easy to see the data that your app is sending/recieving. This post will cover the steps to setup an iOS device to use Charles as a proxy.

More recently, I’ve found Proxyman to be an easier tool to setup paid apps for free android apk - Activators Patch use compared to Charles.

🛠 Configure Charles

We’ll need to specify some initial configuration settings for Charles before we start capturing traffic.

  1. Verify the port that Charles can listen on. Default is. From the Menu go to Proxy then Proxy Settings. In the Proxies tab you’ll find the port #.
  2. Enable SSL Proxying. From the menu go to Proxy then SSL Proxying Settings. In the SSL Proxying tab make sure SSL Proxying is enabled. Also add a wildcard entry to capture everything for now. This can be changed later to filter out certain domains depending on what traffic you want to see. ssl_proxying
  3. Get the IP address. From the menu go to Help then SSL Proxying then Install Root Certificate on Mobile Device or Remote Browser. Make note of your computer’s IP address and port. ip_port
  4. Start the proxy if it didn’t autostart.

📱 Configure iPhone to use Proxy

Since I’m using an iPhone for this tutorial, these instruction will be specific to iOS. However similar steps will also work for Android.

  1. Connect to the proxy by configuring the Wi-Fi connection on the iPhone to use Charles. From the Settings Menu go to Wi-Fi, then tap the little next to the network you’re connect too. Then tap then Manual and how to use charles proxy the IP and port from the previous steps.

  2. Accept prompt that pops up in Charles. You’ll know that a conection has started if you see this prompt.

  3. While connected to the proxy, download and install charles root certificate on the iPhone. After going to this url chls.pro/ssl, follow all the prompts to download and install the cert.

  4. Enable the root cert by going to Settings, General, About, sroll to the bottom and tap Certificate Trust Settings. Enable the toggle for the root cert on that page.

manual_proxyinstall_certenable_cert

Notes

iOS bug saving manual proxy configuration. If this happens, just forget the network and re-add it. I noticed this behavior on iOS 12.3.1.

This setup was all done with devices on the same LAN through Wi-Fi. I can’t speak for other configurations.

SSL Pinning

Some apps implement SSL certificate pinning which means they specifically validate the root certificate. Because the app is itself verifying the root certificate it will not accept Charles’s certificate and will fail the connection. If you have successfully rekordbox 5.8.2 crack - Crack Key For U the Charles root SSL certificate and can browse SSL websites using SSL Proxying in Safari, but an app fails, then SSL Pinning is probably the issue.

Источник: http://johnborg.es/2019/07/charles-proxy-with-device.html

How to Record Logs with Charles Proxy on Windows

We have already published the post about capturing browser logsfor finding out the errors on any website or web application. In this post, you will learn about another method of collecting logsfor getting fixed the errors found on any website or web application. It will be easier to find out the fault if you are able to see what is being sent and received by your web browser. There is a cross-platform application called Charles Proxy that will record all the traffic that is sent and received between the client and server.It will make easy to see and troubleshoot the issues that are generated while testing the software. This software is freely available although the free version does not run more than 3o minutes at a time. It also included with most advanced features such as viewing SSL requesting plain text, simulating slower internet connections and viewing XMLand JSONrequests and responses. This software is available for all of the available OS such as Windows, Mac, and Linux. In this post we are going to explain in detail about installing, setting up and recording the logs through Charles proxy on windows only.

Installing Charles Proxy on Windows

Use the following steps to install Charles proxy on windows.

  1. At first, go to the download page of the Charles proxy website from here.
  2. Download any of the MSI files for your 32 or 64-bit windows.
  3. Open the installation file and click on Next when the dialog box appears.
  4. Accept the terms in the License Agreement and go next.INSTALLING CHARLES PROXY ON WINDOWS
  5. Choose the required folder for installation of the application.INSTALLING CHARLES PROXY ON WINDOWS
  6. Now, click on Install to begin installing.INSTALLING CHARLES PROXY ON WINDOWS

Setting up the Application for Recording Logs

Now, you have to set up the application for recording logs.

  1. Go to proxy menu and click on windows proxy or press Ctrl+Shift+P.
  2. Now, go to help menu, click on How to use charles proxy proxying and then click on Install Charles root certificate.
  3. Click on Install certificate button located under the general tab.
  4. Choose the store location “current user” and click next.
  5. Choose the second option “Place all certificates in the following store” and click on Browser button.
  6. Select “Trusted Root Certification Authorities” and go next to complete the wizard.
  7. Now, click on Yes when confirmation message appears.
  8. Click on OK until the certificate dialog box closes.
  9. To verify the certificate after successfully installed, open certificate dialog box as mentioned in step 2.Setting up the Application for Recording Logs
  10. Go to the certification path tab and observe the certificate status “This certificate is OK”.
  11. To enable SSL proxy for SSL enabled web applications, go to the proxy menu and click on SSL Proxying settings.
  12. Click on Add button and enter the name of the domain or port number. Where domain name can be used with * symbol and the port number. For the websites with SSL certificate, the port number will be 443.SSL Proxying settings
  13. Click on OK to close the dialog box.

Recording Logs with Charles Proxy

  1. When all the setup completes, go to file menu, click on the New session and click on start recording.
  2. You will see the blue circle on the website link while recording the log.Recording Logs with Charles Proxy
  3. Click on the stop to stop the recording
  4. To save recorded log, go to file menu and click on save.

Removing Installed Root Certificate

Use the following steps if you want to remove Installed Root certificate after recording log.
  1. Search “certmgr.msc” from windows search and press enter.
  2. Open “Trusted Root Certification Authorities” folder and click on certificates.Removing Charles Proxy Certificate
  3. Search for  Charles Proxy certificate and delete it.
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Shuseel Baral

Shuseel Baral is a web programmer and the founder of InfoTechSite has over 8 years of experience in software development, internet, SEO, blogging and marketing digital products and services is passionate about exceeding your expectations.

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Источник: https://www.siteforinfotech.com/record-logs-charles-proxy-windows/

Charles Proxy

Proxy server application

Charles Web Debugging Proxy is a cross-platform HTTP debugging proxy server application written in Java. It enables the user to view HTTP, HTTPS, HTTP/2[3] and enabled TCP port traffic accessed from, to, or via the local computer. This includes requests and responses including HTTP headers and metadata (e.g. cookies, caching and encoding information) with functionality targeted at assisting developers analyze connections and messaging.

Features[edit]

  • Network message analysis – Charles shows full messaging sources of all HTTP and similar TCP-based communications that pass via its proxy port.
  • XML, JSON, SOAP interpretation – structured viewers that translate the raw HTTP content into a tree format for analysis.
  • HTML, CSS, JavaScript viewers – providing marked-up/formatted/unminified text content display
  • SSL debugging – allowing decryption of encrypted data to review/troubleshoot the transmitted content.
  • Bandwidth throttling – to simulate slower internet speeds by slowing down bandwidth/speed and introducing latency, for example to simulate a slower 3G connection.
  • Flash development aids – including Action Message Format (AMF) content analysis.
  • Debugging HTTP connections from mobile devices – providing a proxy between an iOS[4] or Android[5] device and a remote site, to debug HTTP connections and behavior that only occur on devices, including debugging video streaming issues, airplay issues, etc. that cannot be tested in the iOS simulator.
  • Remote file debugging – ability to swap out a remote file for a local file to aid debugging a remote site without requiring access to the server files.[6]
  • Debugging aids – such as repeating URL post requests to test server changes, adding breakpoints, or editing request variables.
  • Validation function – ability to right-click any proxy request, and provide validation feedback using the W3C Markup Validation Service, useful for content the W3C service otherwise cannot access directly.

Browser support[edit]

Charles will autoconfigure for use on the following browsers:

  • IE (Windows system proxy settings)
  • Chrome
  • Firefox
  • Safari (Mac OS X or Windows system proxy settings)

See also[edit]

References[edit]

External links[edit]

Источник: https://en.wikipedia.org/wiki/Charles_Proxy

How to use Charles Proxy for how to use charles proxy applications?

How do you track the traffic between your program and a web server? Using Charles proxy, of course! It allows developers of client/server solutions to check if the app they are building has any issues when connecting to the remote sources of data (videos, files, databases). Using the program, one can easily check:

  • how an app behaves with large or small volumes of data;
  • transferred data’s format;
  • requests, responses, and their parameters;
  • the way servers process bad requests and the app processes bad responses;
  • how the app processes errors, etc.

Essentially, Charles allows users to oversee data transmitted between their computer and a certain server, which, under normal circumstances, remains hidden from the users. Programmers and webmasters can use this data to improve the performance of their sites. For regular users, leveraging a proxy can be a decent way to familiarize themselves with the main principles of the Internet’s functioning.

Installation and the first launch

Everything starts with downloading a setup file from the official website. The free trial lasts for 30 days, after which a 30-minute time restriction on a single session will be imposed. To resume your work, you’ll need to restart the app every time it shuts down. If the need for longer sessions arises, you’ll have to purchase the app to continue using it without any limitations. Follow the installation procedure and launch the app.

During the first launch, the program will offer to adjust your network settings so that they could work with it properly. Click Grant Privileges and wait for the app’s interface to load. It is an important step; if it is missed, the app that is being tested won’t be able to use intermediary services offered by Charles.

Charles works perfectly with most modern browsers, both desktop and mobile. The setup procedure, however, may vary from one system to another. To let the software configure automatically, Edge, Chrome, and Safari users don’t have to perform any additional actions after installing the app. Firefox users will need to winrar download filehippo a special add-on to ensure that Charles proxy launches automatically along with the browser.

Launching the program on mobiles

Mind that your mobile device and the computer with the debugger proxy must be connected to the same network. Windows and macOS devices perform all necessary configurations automatically, while mobile devices require manual setup. You don’t need to set the program’s running port by hand; its predetermined value is 8888. However, you’ll need to change the proxy setting of your mobile device (from Off to Manual).

Configuring an iOS device

As mentioned earlier, setting up Charles proxy on IOS is fairly simple: just locate the current network in Settings and change its proxy setting from Off to Manual. Your device will then ask to input the server’s IP, which should be identical to that of your PC. Mind that you’ll need to turn off Charles manually every time you finish using it.

As soon as you start using your iPhone, the proxy will ask you to approve the connection. After that, your mobile device and its IP-address will get on the Access Control list of the proxy.

If you are planning to test your app with an iOS emulator, it should connect to Charles automatically. If it fails to do so, try restarting it or set the proxy as the system one in your macOS.

Configuring your Android device

Not all Android devices have the setting for HTTP proxy. If your phone/tablet does, just follow the procedure that is rather similar to the one described in the iOS configuration: change the name of the proxy to the IP-address of your computer with Charles, and change the port to 8888.

In order to use an Android emulator, add an additional command line in it and type: http-proxy http://LOCAL_IP (this is your computer’s IP-address):8888.

Regardless of the mobile device you use, don’t forget to switch the HTTP proxy off after you finish using it. If you fail to do so, your apps will show network failures.

Working with SSL-Encrypted websites

Mind that Charles won’t work with TubeMate Downloader Crack 3.20.7 + Serial Key Free Download 2021 websites without Charles root certificates. They must be installed by hand, through going to Help>SSL Proxying. Within this menu, you should see a dedicated button for installing the needed certificates. The process will be completed automatically (yet mind that you’ll need to set the certificates’ status to “trusted” in your browser). Fortunately, this process is rather simple:

On a Windows computer (to be used with IE or Edge)

  • When you see the message that your certificate is not trusted, click on Install Certificate. Certificate Import Wizard will be launched.
  • Import it into Trusted Root Certification Authorities and override the automatic selection.
  • Finish working with the wizard.
  • Restart the browser if needed.

Using Firefox

  • Make sure that the browser is connected to Charles.
  • Open https://chls.pro/ssl in Firefox. The browser will show a certificate import dialog. Choose “Trust this CA to identify websites” to finish the import.

Using Chrome

  • First, you’ll need to save Charles root certificate as a Binary Certificate (.cer). This can be done in Charles’ Help menu, by clicking on the SSL Proxying tab.
  • Go to Advanced Settings in Chrome and click “Manage certificates.”
  • Import your newly saved certificate by clicking on the “Trusted Root Certification Authorities” tab.
  • After you finish the procedure, all certificates signed by Charles will be automatically trusted by Chrome.

On macOS

  • Launch Keychain and find Charles among the available options.
  • Click on the certificate to open a panel and choose Trust.
  • In iSkysoft DVD Creator Free Download drop-down menu, select Always Trust and click OK.

After completing the above steps, you should have a ready-to-work setup. On the left side of the program’s interface, you will see the Structure/Sequence tree, where all the how to use charles proxy will appear. By clicking on them, you can see the requests that your app is making to domains. In the field on the right, all the request configurations and details will be shown.

If you need to collect data for future analysis, press the Recording button at the top. If you are interested in a specific domain, right-click on it and select Focus. This will hide all other domains under the Other Hosts group.

Installing Charles SSL certificate on mobile platforms

For IOS users, the process is rather simple. The SSL certificate can be installed only upon the HTTP proxy setup. To receive the SSL certificate, follow the link. Give your permission to install the certificate and use the proxy without any limitations.

Android users will face more difficulties, as they need to configure every particular app to trust Charles for making the whole thing work. To do this, add the Network Security Configuration File to the application. This file will make your app trust certificates installed by Charles.

Using Charles to modify Requests/Responses: Rewrite tool

When you can clearly see all requests to a necessary domain, you can try and modify them in order to find possible issues with your app or website. For example, you can try and change any parameter in the headers or the body of a request and check what response the server is going to give. You can also send a correct request but change the response to see how your app processes faulty responses. All of this can be done with the help of the Rewrite tool that is used exactly for that: modifying requests or responses.

Go to Tools>Rewrite>Enable Rewrite to be able to use it with any domain. When you click on the domain name, you will observe the Rewrite button in the bottom right corner. Click on it to add your location and rule. In the dialog window that appears, click Add and type * to process all the requests or a specific URL and path. In the rule field, click Add and:

  • Select the type of rule you want to create in the drop-down menu.
  • Check either Request or Response to specify where the rule will be applied.
  • Use Match fields to write what request/response you will be working with or leave them blank to process all of them.
  • Use Replace fields to enter either the name or the value of the rule you will modify.

What makes Charles Proxy stand out from similar propositions?

The software has many notable advantages over its competitors. First, there is a significant trial period, which allows users to gain a comprehensive view of the app’s potential. Charles proxy works with most operating systems and browsers available today, making it an ultimate solution for anyone. The whole system is fairly easy to use, especially if you aren’t planning to work with SSL encrypted websites (which, however, can hardly be a case in 2020).

Conclusion

When testing an app or website, checking its usability is not the only way to see if there are bugs and issues. To fully understand and eliminate possible issues with the network connections, using Charles or a similar tool for debugging is crucial. We recommend Charles because it can be installed within minutes, provides a significant number of useful features, and works on a wide variety of platforms.

Источник: https://exyte.com/blog/how-to-use-charles-proxy-for-debugging-applications

Almost every application these days communicates over HTTP: websites, RESTful services, and even SOAP APIs all make use of Hypertext Transfer Protocol. For the most part, we don’t worry too much about what is happening at the network level when we’re building these applications.

However, from time to time a problem will show up that needs us to drop to the level of the network to figure out what is going on. This is the story of one such situation and how using Fiddler or Charles could make your life much easier.

I was working with a relatively simple RESTful service which was actually hosted on the local machine. It was firewalled and I was interacting with it by pulling messages from Azure Service Bus, transforming them, and passing them to the local API. Everything was going well from Postman, the fantastic API test tool, but from the C# code I kept getting errors about being unauthorized. This API made use of Basic HTTP authentication, which passes a token in the HTTP headers.

https://lh6.googleusercontent.com/MHVAD1VB8C5TiQz1ynJTuGLdyqJtaqecwE2vGCvF_rOKkmyE65Hw6ATbBnElT-FJPkbXZzVSvdTw9KHeqeBYBecEGYZESbwkhtabObtJU1Uq1wg10A1biJBKFL7U7IGjr0qev6YS Postman showing an HTTP request against localhost.

I had already logged the HTTP headers I was sending in my C# code and they all looked correct. Why on earth was this not working? To debug this issue I needed to get into the raw packets being sent back and forth between the service and the API.

In general proxies can be used for all sorts of things:

  • caching data coming from external websites to reduce the amount of traffic going over the external interface.
  • caching data coming from your web server onto cheaper machines that don’t need to hit a database or render a complex page.
  • streamline the requests you make on your cell phone to reduce the bandwidth.

In this case, we want to simply log out all the information transmitted between the service and the API.


Try this before your next .NET push

Fiddler vs Charles

There are a number of good options that can fill the role of a logging proxy. Today we’ll look at Fiddler and Charles. Both these tools have been around for many years and are highly mature. Fiddler was recently (well if 2012 is still recent) bought by Telerik who now maintain it, but it was originally released in 2003. Even before Fiddler, the Charles proxy existed having been released in 2002. In what is almost a microcosm of the development environment back in the early 2000s, Fiddler was written in .NET and Charles in Java. After all these years both tools have picked up a pretty impressive suite of capabilities.

Let’s see how they can be used to solve my confusing HTTP API authentication problem, starting with Fiddler.

Fiddler

The installation package can be obtained from http://www.telerik.com/fiddler, and it’s relatively small and easy to install. For many years Fiddler was a standalone product, but fairly recently it was purchased by Telerik. They left the application free but have started development on a spin-off tool called FiddlerCore that will be the foundation of Fiddler going forward. You are also able to purchase FiddlerCore for use in your own applications should they need to capture traffic (You can read more about the future of Fiddler at https://www.telerik.com/blogs/fiddlercore-for-net-standard-and-fiddler-orchestra-the-future-of-fiddler). I think there could be some very interesting applications built on top of FiddlerCore, but we’ll leave them for another article.

After Fiddler was installed I ran some requests through it and was immediately reminded that the API was using HTTPS. Putting a debugging proxy between a client and an HTTPS endpoint won’t work because HTTPS cannot be decrypted by the proxy. Fortunately, Fiddler offers a workaround where it will insert a Zemana AntiMalware Premium 3.2.15 License key - Crack 2020 certificate in the SSL keychain and use that to fake a certificate for the endpoint.

HTTPS intercept options dialog. Selecting Decrypt HTTPS traffic will insert a new certificate in the certificate how to use charles proxy width= The HTTPS intercept options dialog. Selecting Decrypt HTTPS traffic will insert a new certificate in the certificate chain

With the SSL certificate in place, network traffic can now be intercepted. Here we can see the basic authentication token being passed to the server correctly. You can also see that the server responded with a 301 reply. That’s quite interesting because 301 indicates how to use charles proxy the resource we’re looking for has moved and that the client should try the new location.

Fiddler showing the token being passed across the network connection Fiddler showing the token being passed across the network connection

The URL in the original request is /api/v1/companies/PTPTest/inventory/items, and the one to which the 301 redirects is /api/v1/companies/PTPTest/inventory/items/. The difference is subtle,  but the original URL is missing a trailing slash.

This highlights one of the differences between how Postman handles 301 redirects, and how they are handled by the HTTP client in .NET and specifically regarding the Authorize header. Postman preserves the header and sends it on the subsequent request. The HTTP client’s behavior is to strip the token on the next request. It isn’t clear from the HTTP spec what the correct behavior is here, but it seems that it is common to strip the Authorize header, possibly for security reasons or server compatibility. This explains why Postman worked fine, whereas the HTTP client failed with a permission error. Altering the URL on the .NET side to have the terminating slash (/) fixes everything.

Locating the error in Fiddler was fairly easy once the SSL Proxy was setup. The list of requests on the left-hand side and details on the right-hand side is pretty easy to understand. The interface does feel quite busy with multiple levels of tabs and then a great deal of wasted space. It is a user interface which was clearly created by a programmer.

Let’s try doing the same analysis using Charles.

Charles

Charles can be downloaded from their website. The Charles installation is painless and you can be up and running quickly. The one drawback to Charles is that it is not free. Licenses cost about $50 with some discounts available for purchasing multiple licenses. In my mind, $50 is a pretty reasonable amount to pay for a tool such as this.

Setting up Charles to handle HTTPS traffic is also quite easy. The setting can be found under the tools menu and is called SSL Proxying Settings (Proxying, incidentally, is a fantastic Scrabble word).

options dialog for SSL interception in Charles The options dialog for SSL interception in Charles

Once again I was able to identify the token was being correctly passed to the 301 and then being stripped when the request was redirected. The layout of the screen was such that it is immediately obvious what the redirect did.

Charles showing the authorization header being passed as part of the request. It is clear what the redirect did by examining the next request below it in the top panel. Charles showing the authorization header being passed as part of the request. It is clear what the redirect did by examining the next request below it in the top panel.

The user interface in Charles is dramatically cleaner than Fiddler. The tab layout is nice and the vertical layout actually flows better than the left-to-right layout of Fiddler. It was how to use charles proxy to find the authorization token and the multiple requests to the server.

One of the useful features that Charles provides is the ability to limit bandwidth. This allows you to simulate how your site would perform on a variety of slower connection speeds.

Charles limits the bandwidth to a 56.6k modem.

Limiting the bandwidth to a 56.6k modem. Unfortunately, Charles does not include making modem connection sounds.

This can be done in Fiddler too, but it must be configured from the script editor which is far less friendly. Those with old eyes, like me, will notice the lack of high DPI support in the right pane of the editor too.

Charles limiting the bandwidth to modem speeds Limiting the bandwidth to modem speeds

At an initial glance, it might seem that to have a cleaner interface we might be losing out on a great deal of functionality in Charles. That may be the case but I could not find any common action that I couldn’t do in Charles but could in Fiddler. Any advanced options how to use charles proxy Fiddler were not missed, but my scenario was also quite simple.


Try this before your next .NET push

Conclusion

Fiddler provides how to use charles proxy very advanced capabilities in its script editor. One can go about creating plugins to exercise quite complex and esoteric scenarios. There is even a site that lists a number of really nifty looking plugins for Fiddler. My favorite is the one which will rotate all the images that pass through the proxy – perfect for an April Fools joke.  Some of the plugins perform really advanced analysis of a site doing things like input fuzzing and generating content security policies. These extensibility points are simply missing from Charles.

For many years I’ve been a user of Fiddler – it has been my default go to. Both tools support HTTP2 so there is no fear that your slick new site won’t work in either tool. There is no question that Fiddler supports some much more advanced scenarios than Charles, but they are scenarios that I’ve infrequently found a need for in my career. With this in mind and knowing how much nicer the user experience is in Charles, I think I’ll probably switch my default tool to Charles. I’m certainly not going to uninstall Fiddler because it still has its place, but I just think that its place might be in a dusty corner into which I only reach when faced with the most unusual of problems.

Looking to improve your code while writing it? Download Stackify Prefix, the only dynamic code profiler for .NET for free.

About Simon Timms

Simon is a polyglot developer who has worked on everything from serial port drivers on an Android tablet, to NServiceBus, to processing tens of thousands of messages a second using stream analytics, to building Angular web applications. All that in the last year. He is the author of a number of books on JavaScript and ASP.NET and blogs far less regularly than he should on both the Western Dev's site (http://westerndevs.com) and on his blog (http://blog.simontimms.com). He is also the least visible member of the ASP.NET monsters (http://aspnetmonsters.com). His interests change as frequently as he changes his underwear. At the moment he is interested in F# and how AI is going to change how we develop software. He is a big picture specialist who can maintain a cogent view of an entire system and pick the right technology to solve a problem.

Источник: https://stackify.com/fiddler-vs-charles/

Charles Proxy in Android emulator

In this article, we will discuss about how to capture the traffic of our Android how to use charles proxy using a tool called Charles Proxy. I recommend you continue reading, you will love it! At least we love here at Apiumhub.  

Developing a Web application is immediately viewing and analyzing all HTTP requests that are made. Client requests and server responses are easily traceable and reproducible. Instead, when you are working with a mobile device, both physical and virtual, the analysis of this traffic is not as trivial.

Therefore we will present a tool that is very useful, as much in the case covered in this article, as in many others, Charles Proxy.

This tool can be used to monitor all HTTP and HTTPS traffic, using for it certificates that the Proxy itself provides us, with a duration of 24 hours.

 

SETUP CHARLES PROXY

First of all we will configure our Charles Proxy. To do this, let’s Proxy in the menu and follow those steps:

 

  • Proxy > Proxy Settings: We leave the port as default and activate “Enable transparent HTTP Proxying”

charles proxy

 

  • Proxy > lL Proxy Settings: Activate “Enable SSL Proxying” and we add a new entry in Locations (Host: *, Port: *)

 

Charles proxy

 

HOW TO SET UP ANDROID EMULATOR

 

Once we set up Charles Proxy, we are going to set up our Android emulator. For that, when the time of launching it arrives, we will need to pass the IP of our Charles Proxy as an environment variable (in Charles Proxy: Help > Local IP Address), with something similar to the following command:

emulator -netdelay none -netspeed full -avd <emulador> -http-proxy http://<ip-proxy>:8888


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(If we have changed the port for another when we had to set up the Charles, we also have to change the port value)

Once the emulator is opened, we will install the certificate that gives us Charles Proxy by opening from our mobile browser this url. A dialog will automatically appear to install a new certificate on mobile as shown in the following picture: 

 

Charles proxy

 

It should be enough by putting a name and accepting the installation. Once all these steps are done, we go to Charlesproxy and click on the button “Start Recording” (Or also, from Proxy > Start Recording) and from now you will have any HTTP/HTTPS traffic exiting from the mobile. I leave you with a screenshot of the final result:

 

charles proxy

 

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If you enjoyed reading this article about Charles Proxy, you might like…

 

 

Before I leave you, I would just like to mention that if you’re looking for a new job opportunity as a software developer, you should definitely have a look at our job vacancies.

 

Источник: https://apiumhub.com/tech-blog-barcelona/charles-proxy-android-emulator/

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