Charles Fiddler For Mac

Posted : admin | On 23-04-2021



When I was on Windows, I was using Fiddler as a HTTP debugging proxy. After I moved to Mac, I started to look for an alternative.

There are ways to make Fiddler work on Mac too, but it didn’t work for me on a first try, and I didn’t want to dive deeper. Besides, I wanted to get some nice-looking and natively-performant Mac OS app.

Fiddler vs Paw: What are the differences? Fiddler: A free web debugging tool. It is a free web debugging proxy for any browser, system or platform. It helps you debug web applications by capturing network traffic between the Internet and test computers. Charles (commonly used in IOS) wireshark Fiddler (MAC is not available, which needs windows system or remote installation) Installation package: download the latest on the official website or Baidu has the latest. Installation (refer to the tutorial at the end of this article) Charles and fiddler. I would like to know if there are any applications like fiddler but for mac OS X, as I need to debug some requests from web applications in Mac OS X. I used to do it with fiddler on Windows and would love to have this tool available on Mac as well. Aside from Fiddler, Charles and Poster (Firefox plug in). Are there any other free to use https interception (and editing) applications out there? Especially ones which can be installed w/o admin privileges. Achilles comes to mind, but I don't think it can handle https traffic. Security http testing https.

So, I started looking. Soon enough I found these questions at Stack Exchange:

  1. Looking for HTTP debugging proxy for Mac similar to Fiddler on Windows;
  2. Are there any HTTP/HTTPS interception tools like Fiddler for mac OS X?;
  3. HTTP debugging proxy for Linux and Mac.

From those I got to know Charles, which trial version I installed immediately. Well, what can I say: it gets the job done, but it feels uncomfortably slow and weights too much for such an application. And when I discovered, that it is Java-based, I had no more questions in that regard. On top of that it costs $50 per license, which is just too expensive.

I didn’t find any good alternatives to Charles, so I started to getting upset (and preparing $50), but then on this website I discovered Proxie. Actually, there it is named as Cellist (apparently, that’s its former name).

And this is exactly the application I was looking for:

  • HTTP debugging proxy, that works with HTTPS too;
  • pretty light-weight and natively-performant;
  • nice-looking;
  • costs only $10.

Here’s a screenshot:

Very conveniently organised, you can view packets grouped by URL, view packets by types, and also you can create your own grouping filters: Download gta for mac os x free.

It is a bit unfortunate though, that Proxie does not have a trial period, so I had to download a cracked version from a warez tracker to try it out. And only after I made sure, that it has all the functionality I needed, I deleted it and purchased the application from App Store:

Okay, now about how to use it.

From the same Mac OS machine

When you launch Proxie, it starts to listen to your localhost’s specified port, as it is shown on the top of the application’s window. And you need to set-up this proxy in your network settings, so all of your applications would send their traffic through it.

Open Mac OS network preferences, choose the network (Wi-Fi in my case) and click Advanced:

Despite the fact that Proxie shows your network address, it’s better to use the old good 127.0.0.1 (and the port that Proxie listens to). Do it for both Web Proxy and Secure Web Proxy:

Note, that Proxie does not do it by itself. Neither does it set the proxy settings off on exit, meaning that when you’re done with HTTP debugging, you need to go there (system network preferences) again and uncheck both Web Proxy and Secure Web Proxy checkboxes.

Now you need to install the Proxie’s certificate into your system (implementing man-in-the-middle). If you won’t do that, Proxie won’t be able to properly sniff encrypted HTTPS packets.

Go to the Proxie settings, mark the decryption checkbox and export certificate:


Find the exported proxie-ca.pem, double-click it, and add it to your keychain:

Now open Keychain Access.app, find this certificate in the list, double-click it and make it trusted:

Now you can inspect your packets (including HTTPS ones) in Proxie.

Charles Proxy Vs Fiddler

But.

For

Not every application (especially Terminal apps) respects system proxy settings. So, if you don’t see packets from your application in Proxie, that means that your application is one of those, and you need to specify proxy settings for it manually (in its config, source code, etc).

For example, I am testing some .NET Core application in Visual Studio Code. So, in order to make it using proxy, I need to do this:

From iPhone

…Or any other device in your local network. This is already described in the Proxie documentation pages (Help -> About HTTP Decryption), but I’ll add my comments anyway.

So, in case of an iPhone you need to:

  1. Set-up a proxy in your iPhone Wi-Fi settings;
  2. Add a Proxie certificate to your iPhone and make it trusted.

Logically enough, there is no need to enable proxy in Mac OS network preferences.

First one is easy, go to Settings -> Wi-Fi -> Click on the blue circled i on your current network -> Configure Proxy -> Manual:

Then open this URL (sslca.io) in browser on your iPhone and install Proxie’s certificate:


And finally go to your iPhone Settings -> General -> About -> Certificate Trust Settings and enable Proxie CA:

Now you will see the traffic from your iPhone coming through Proxie on your Mac:

Awesome.

Weird enough though, that AppStore refuses to connect even with the trusted certificate, whilst other applications work just fine. But that’s okay, because it’s not the AppStore’s traffic I was after, as you can see.

When you’re done debugging, don’t forget to disable proxy settings and “untrust” the Proxie certificate (just in case).

They’ve added a free trial version: https://proxieapp.com

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How do I capture the HTTP log on a Mac using Fiddler?

How do I set up Fiddler to capture logs on a Mac?

To capture HTTP logs on Mac using Fiddler:

Charles Fiddler For Mac Catalina

  1. Download Fiddler for Mac at https://www.telerik.com/download/fiddler-everywhere
  2. Drag the Progress Telerik Fiddler DMG file to the Applications folder.
  3. Open the Progress Telerik Fiddler app from the Applications folder, then authenticate either using your Touch ID, or your password.
  • Note: Authentication is required as Fiddler is installed as a proxy server on your Mac, and it makes changes to the proxy settings. The changes to the proxy settings revert once you close the Fiddle application.
  1. Go to Settings > HTTPS, then enable Decrypt HTTPS traffic.
  2. Go to your desktop, then click on FiddlerRootCertificate.crt.
  3. In Keychain Access, click on DO_NOT_TRUST_FiddlerRoot certificate to open the Trust dialog
  4. Choose Always Trust in the When using this certiciate drop-down menu.
  5. Restart the Fiddler app and ensure there is a Capturing..button at the bottom left of the window.
  6. Replicate the issue, then go to File > Save archive > All sessions to save the log file.