Download Fiddler for OS X Beta and use our Fiddler forum to leave your comments, ideas and suggestions for further development. Getting Started with Fiddler for OS X Beta. Once you download the new Fiddler for OS X file, follow these steps to get up and running with it. Download Fiddler Free. Download for.NET Framework 4. For trending and high-quality applications, including Software (Windows, Mac OS X, Linux), and Web Apps. Fiddler for OS X Beta is now available for download. Over the years, we have received numerous requests from our user community to provide a Fiddler build for OS X. While Fiddler for Windows can.

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fiddler for os x beta is now available for download.

over the years, we have received numerous requests from our user community to provide a fiddler build for os x. while fiddler for windows can be used as a proxy for apps running on os x, there is still great value in being able to run fiddler on os x natively.

so we have ported the latest version of fiddler to the mono framework which in turn supports os x—and you can grab the beta bits today.

getting started with fiddler for os x beta

once you download the new fiddler for os x file, follow these steps to get up and running with it:

1. if you don’t have the mono framework installed on your mac, please download it and install it. if you already have it installed, please update it to the latest version.
2. if you just installed mono, please open terminal and type in: /library/frameworks/mono.framework/versions//mozroots –import –sync the mono framework has its own trusted root certificates store. currently (at mono version 4.2.4) this store remains empty after installing mono on os x. fiddler uses the certificates in this store to validate the certificates of the websites visited. so you need to populate this store with a set of commonly trusted root authorities to avoid getting constant certificate warnings by fiddler. the mozroots tool imports trusted authorities from the mozilla lxr.
3. extract fiddler-mac.zip to a folder you have write access to. it is recommended that the full path to the fiddler install folder does not contain any windows path illegal characters. ( at present it is possible that some fiddler functionality, e.g. various file exports or fiddler script won’t handle such paths. )
4. open terminal and navigate to the folder form 3.
5. type mono fiddler.exe in terminal.

while the oct 2016 fiddler release for os x increases development speed, this approach introduced some limitations, which you will find more details about in the next section.

limitations, known problems and workarounds

unstable ui

fiddler for os x has the same familiar look that fiddler for windows has, however, it is built on top of the open source winforms mono implementation. the quality of that implementation is significantly lower than that of microsoft winforms, and this results in a less than ideal user experience. while we were aware of that when we began our work on the macos version of fiddler, we chose to go this way so that we can bring os x support to life faster, not sacrifice the roadmap for fiddler for windows and base our future work on real world usage.

the most problematic areas in the ui for the beta 1 release are resizing the window and resizing elements inside the window. that oftentimes results in poor or laggy redrawing of all the affected elements. quite often, though, hovering over or clicking on the affected areas will fix things.

when fiddler is running and ‘decrypt https traffic’ is on, safari cannot access some popular sites (facebook/twitter/github etc.)

currently, this effect is limited to safari only and it happens only if you visited the site before opening fiddler. cleaning the browsing history (just the history not cache or cookies) for the affected site(s) fixes the problem.

our preliminary research shows this problem occurs with websites using tls versions greater than 1.0. the lack of mono implementation of tls 1.1 and 1.2 limits fiddler for macos to using tls 1.0 only. rather unfortunately, fiddler tls 1.0 connection comes after tls 1.2 connection has been made to the same domain which doesn’t seem to be acceptable to safari.

tls 1.1 and 1.2 not supported

this is a hard limitation introduced by the current state of tls implementation in the mono framework. so fiddler for os x cannot use these protocols at present.

ssl/tls handshake properties not available

fiddler for os x beta cannot display these at present. this is work in progress.

auto update

the initial version of fiddler for os x can be updated only manually.

limited lifespan

this version of fiddler for os x will work for 60 days and then it will need to be updated.

Published at DZone with permission of Tsviatko Yovtchev, DZone MVB. See the original article here.

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Recent Developments

For discussion on the latest changes to Charles, please see Karl’s blog.

Charles 4.5.6 released with minor bug fixes and patched security vulnerability. Read more.

Charles 4.5.5 released including bug fixes for SSL certificate imports. Read more.

Charles 4.5.2 released including new features, bug fixes and improvements. Read more.

Charles 4.2.8 released with minor bug fixes. Read more.

Charles 4.2.7 released with minor bug fixes and improvements. Read more.

Charles Security Bulletin for a local privilege escalation in Charles 4.2 and 3.12.1 and earlier. Read more.

Charles 4.2.5 released with major bug fixes and minor improvements. Read more.

Charles for iOS released. Read more.

Charles 4.2.1 released with important bug fixes. Read more.

Charles 4.2 released with major new TLS debugging capability, minor improvements and bug fixes including macOS High Sierra support. Read more.

Charles 4.1.4 released with minor improvements and bug fixes. Read more.

Charles 4.1.3 released including Brotli compression support and other minor bug fixes and improvements. Read more.

Charles 4.1.2 released with bug fixes and minor improvements. Read more.

Charles 4.1.1 released with bug fixes. Read more.

Charles 4.1 released including major new features and bug fixes. Read more.

Charles 4.0.2 released including bug fixes and minor improvements. Read more.

Charles 4.0.1 released including bug fixes. Read more.

Charles 3.11.6 released with support for macOS Sierra and minor bug fixes. Read more.

Charles 4 released featuring HTTP 2, IPv6 and improved look and feel. Read more.

Charles 3.11.5 released including minor bug fixes; especially fixes SSL certificate installation on Android. Read more.

Charles 3.11.4 released with support for ATS on iOS 9 and crash fixes for older versions of Mac OS X. Read more.

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Charles v3.11.3 released including bug fixes and minor improvements. Read more.

Charles v3.11.2 released with SSL and Websockets improvements. Read more.

Charles 3.11 released including major new features. Read more.

Charles 3.10.2 released with bug fixes and improvements. Read more.

Charles 3.10.1 released with minor bug fixes. Read more.

Charles 3.10 released with improved SSL (new SSL CA certificate install required), major new features and improvements. Read more.

Charles v3.9.3 released with improvements to SSL support, Mac OS X Yosemite support and other minor bug fixes and improvements. Read more.

Charles v3.9.2 released with minor bug fixes. Read more.

Charles 3.9.1 released with minor bug fixes and improvements. Read more.

Charles 3.9 released with major new features and bug fixes, including the ability to 'focus' on hosts so they are separated from the noise. Read more.

Charles 3.8.3 released with support for Mac OS X Mavericks and minor bug fixes. Happy Mavericks Day. Read more.

Charles 3.8.2 released with minor bug fixes. Read more.

Charles 3.8.1 released with minor bug fixes and improvements. Read more.

Charles 3.8 has been released with new features and bug fixes. Read more.

Charles 3.7 has been released. Includes new features, bundled Java runtime (so you don’t need to install Java anymore), and bug fixes. Read more.

Charles 3.7 beta 2 has been released. This changes the SSL signing for Charles on Mac OS X to use Apple's new Developer ID code-signing. Read more.

Charles v3.6.5 released including bug fixes and minor changes. Read more.

Charles v3.6.4 released including major bug fixes and enhancements. Read more.

Charles v3.6.3 released including minor bug fixes. Read more.

Charles v3.6.1 released including minor enhancements and bug fixes. Read more.

Charles v3.6 released including new features, enhancements and bug fixes. New features include HAR and SAZ file import. Read more.

Charles v3.5.2 released including bug fixes and minor new features. Read more.

Charles 3.5.1 released. Minor bug fixes. Read more.

Charles 3.5 released. Major new features, bug fixes and enhancements.

Charles 3.4.1 released. Minor features and bug fixes.

Charles 3.4 released. Major changes especially to SSL.

New website launched. Follow @charlesproxy on Twitter. Say hi in San Francisco when I'm there for WWDC!

Charles 3.3.1 released. Minor new features and bug fixes. Experimental 64 bit Windows support. Read more.

Charles 3.3 released. Major new features. Download

Charles Autoconfiguration add-on for Mozilla Firefox adds support for Firefox 3.1

Charles 3.2.3 released. Minor new features and bug fixes.

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Charles 3.2.2 released. Minor new features and bug fixes.

Charles 3.2.1 released. Minor new features and bug fixes.

Charles 3.2 released. Major new features. Release Notes

Charles 3.2 public beta released. Download and more information on my blog.

Charles 3.1.4 released. Bug fixes and minor new features.

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Charles Mozilla Firefox add-on updated for compatibility with Firefox 3.0.

Charles 3.1.3 released. Minor bug fixes, minor new features.

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Charles 3.1.2 released. Minor bug fixes.

Charles 3.1.1 released. Minor bug fixes.

Charles 3.1 released.

Charles 3.0.4 released. Fixes SSL bug on Java 1.4.

Charles 3.0.3 re-released. Fixes launch bug on computers that haven't used Charles before.

Charles 3.0.3 released. Various improvements and minor bug fixes.

Charles 3.0.2 released. Minor bug fixes and improvements.

Charles 3.0.1 released. Minor bug fixes.

Charles 3.0 released. Major new features and improvements

Charles 3.0 public beta released.

Charles v2.6.4 release. Minor bug fixes:

• IBM JDK compatibility
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Charles v2.6.3 release. Minor bug fixes:

• Fixed Port Forwarding fault introduced in v2.6.2

Charles v2.6.2 release. Major improvements and bug fixes including:

• No more recording limits. Large responses are now saved to temporary files, reducing memory usage.
• MTU support in the throttle settings
• AMF3 / Flex 2 bug fixes

Charles v2.6.1 release. Minor bug fixes and improvements:

• SOAP information visible while response is still loading
• AMF3 externalizable object parsing regression fixed
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Charles v2.6 release. Major improvements and bug fixes including:

• Major UI overhaul
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Charles v2.5 release. Major improvements and bug fixes including:

• Major UI improvements
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• Major improvements to AMF / Flash remoting viewer
• Thank you to everyone who made suggestions and participated in the long testing process.

Charles v2.4.2 release. Minor improvements and bug fixes including:

• Support for request body compression (used by web services)
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Charles v2.4.1 release. Minor improvements and bug fixes including:

• Firefox extension improved
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• SSL error reporting improved when a connection cannot be made to a remote host
• Port Forwarding tool and Reverse Proxy tool re-bind exception fixed

Charles v2.4 release. Major new features, improvements and bug fixes including:

• AMF 3 support
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• Automatic Update Checking
• Documentation wiki open to public

Charles v2.3 release. Major improvements and bug fixes including:

• Proxy implementation improvements including better handling of keep-alive connections
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Charles v2.2.1 release. Minor improvements and bug fixes including:

• Further improved Firefox proxy configuration
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Charles v2.2 released. Major enhancements and bug fixes including:

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• Improved Firefox proxy configuration
• XML viewer improvements
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Charles v2.1 released. Major new features and enhancements including:

• Automatic Firefox proxy configuration
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Charles v2.0 released. Major enhancements and improvements.