Configure Browsers

Clear Cache

To ensure all requests are sent and captured, clear your browser's cache before beginning a capture.

Chrome, Edge, and Brave

• To capture traffic from most browsers, enable File > Capture Traffic.
• Record traffic sent to http://localhost or htp://127.0.0.1 from the targeted browser.

Firefox

• To capture HTTP traffic from Firefox 4+, either:
  • Click Tools > Monitor with Fiddler > Use Fiddler automatically to configure with [FiddlerHook][8], or
  • Click Tools > Options > Advanced > Network > Settings > Use System Proxy Settings.
  
• Capture HTTPS traffic from Firefox

Manual Configuration

To manually configure any browser to send traffic to Fiddler, set the browser to connect to a proxy server. This setting is usually in the Options or Preferences menu. Use these settings:

Address: 127.0.0.1
Port: 8888

Note: If a browser uses these settings, revert these settings after you close Fiddler, or the browser will not load pages. For example, Firefox will show the following error message:

To instead allow Fiddler Classic to automatically enable and disable the proxy, use Proxy Auto-configuration with a URL pointing to %userprofile%\Documents\Fiddler2\Scripts\BrowserPAC.js.

For example, in Firefox, click Tools > Options > Advanced > Network > Settings, and input the URL of the BrowserPAC.js.

To find the correct auto-configuration URL from Fiddler:

1. Click Tools > Options > Connections.

2. Clicking the Copy Browser Proxy Configuration URL link.