Recent Developments

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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.

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.

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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.

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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.

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.

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

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

• Chart tab now includes charts for sizes, durations and types
• Request & Response can now be displayed combined on one split-panel
• SSL handshake and certificate errors are now displayed in the tree

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
• Improved malformed Referer header support

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
• AMF view for AMF3/Flex messages simplified to hide Flex implementation details

Charles v2.6 release. Major improvements and bug fixes including:

• Major UI overhaul
• JSON and JSON-RPC support
• SOAP support

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

• Major UI improvements
• Support for new filetypes including FLV
• 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)
• Fix for parsing of AMFPHP responses
• Improvements to AMF viewer

Charles v2.4.1 release. Minor improvements and bug fixes including:

• Firefox extension improved
• AMF 0 and AMF 3 parsing improved
• Look and Feel changes to give a greater (and more consistent) range of font sizes in the Charles look and feel
• 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
• SSL support for IBM JDK (thanks to Lance Bader for helping solve this)
• 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
• SOCKS proxy added, so any SOCKSified application can now run through Charles
• External proxies configuration improvements including authentication
• Flash Remoting / AMF viewer improvements
• Dynamic proxy port support, for multiuser systems

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Charles v2.2.1 release. Minor improvements and bug fixes including:

• Further improved Firefox proxy configuration
• Port Forwarding enhancements including port ranges and UDP forwarding
• Bug fixes for Reverse Proxy and AMF viewer

Charles v2.2 released. Major enhancements and bug fixes including:

• Improved Firefox proxy configuration
• XML viewer improvements
• Line numbers displayed in ASCII viewer

Charles v2.1 released. Major new features and enhancements including:

• Automatic Firefox proxy configuration
• Formatted form posts and query string information
• Parsing of SWF and AMF (Flash Remoting) binary formats

Charles v2.0 released. Major enhancements and improvements.

OS X v10.5.1 and later include an application firewall you can use to control connections on a per-application basis (rather than a per-port basis). This makes it easier to gain the benefits of firewall protection, and helps prevent undesirable apps from taking control of network ports open for legitimate apps.

Configuring the application firewall in OS X v10.6 and later

Use these steps to enable the application firewall:

1. Choose System Preferences from the Apple menu.
2. Click Security or Security & Privacy.
3. Click the Firewall tab.
4. Unlock the pane by clicking the lock in the lower-left corner and enter the administrator username and password.
5. Click 'Turn On Firewall' or 'Start' to enable the firewall.
6. Click Advanced to customize the firewall configuration.

Configuring the Application Firewall in Mac OS X v10.5

Make sure you have updated to Mac OS X v10.5.1 or later. Then, use these steps to enable the application firewall:

1. Choose System Preferences from the Apple menu.
2. Click Security.
3. Click the Firewall tab.
4. Choose what mode you would like the firewall to use.

Advanced settings

Block all incoming connections

Selecting the option to 'Block all incoming connections' prevents all sharing services, such as File Sharing and Screen Sharing from receiving incoming connections. The system services that are still allowed to receive incoming connections are:

• configd, which implements DHCP and other network configuration services
• mDNSResponder, which implements Bonjour
• racoon, which implements IPSec

To use sharing services, make sure 'Block all incoming connections' is deselected.

Allowing specific applications

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To allow a specific app to receive incoming connections, add it using Firewall Options:

1. Open System Preferences.
2. Click the Security or Security & Privacy icon.
3. Select the Firewall tab.
4. Click the lock icon in the preference pane, then enter an administrator name and password.
5. Click the Firewall Options button
6. Click the Add Application (+) button.
7. Select the app you want to allow incoming connection privileges for.
8. Click Add.
9. Click OK.

You can also remove any apps listed here that you no longer want to allow by clicking the Remove App (-) button.

Automatically allow signed software to receive incoming connections

Applications that are signed by a valid certificate authority are automatically added to the list of allowed apps, rather than prompting the user to authorize them. Apps included in OS X are signed by Apple and are allowed to receive incoming connections when this setting is enabled. For example, since iTunes is already signed by Apple, it is automatically allowed to receive incoming connections through the firewall.

If you run an unsigned app that is not listed in the firewall list, a dialog appears with options to Allow or Deny connections for the app. If you choose Allow, OS X signs the application and automatically adds it to the firewall list. If you choose Deny, OS X adds it to the list but denies incoming connections intended for this app.

If you want to deny a digitally signed application, you should first add it to the list and then explicitly deny it.

Some apps check their own integrity when they are opened without using code signing. If the firewall recognizes such an app it doesn't sign it. Instead, it the 'Allow or Deny' dialog appears every time the app is opened. This can be avoided by upgrading to a version of the app that is signed by its developer.

Enable stealth mode

Enabling stealth mode prevents the computer from responding to probing requests. The computer still answers incoming requests for authorized apps. Unexpected requests, such as ICMP (ping) are ignored.

Firewall limitations

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The application firewall is designed to work with Internet protocols most commonly used by applications – TCP and UDP. Firewall settings do not affect AppleTalk connections. The firewall may be set to block incoming ICMP 'pings' by enabling Stealth Mode in Advanced Settings. Earlier ipfw technology is still accessible from the command line (in Terminal) and the application firewall does not overrule any rules set using ipfw. If ipfw blocks an incoming packet, the application firewall does not process it.