Filters Reference

Fiddler's Filters tab allows you to easily filter and flag traffic displayed in the Fiddler UI, as well as do some lightweight modifications.

Hosts

The Hosts filter enables you to flag or exclude traffic to specified fully-qualified domain names.

Client Process

The process filter allows you to control which processes' traffic is shown within Fiddler.  Note that Fiddler will still proxy traffic sent to it from other applications, but that traffic will be hidden from the Fiddler Session List.

Breakpoints

The breakpoints enable you to break requests or responses that contain the specified attributes.

Response Status Code

This list enables you to block HTTP errors, redirects, authentication challenges and cache-reuse status codes.

Response Type and Size

Using these options, you can control what types of responses appear within the session list.

The list of "Block" checkboxes enables blocking responses of the specified types, returning a HTTP/404 error to the client instead of the target resource.

Request Headers

Using these options, you can add or remove HTTP request headers, and flag responses that contain certain headers.

Response Headers

Using these options, you can add or remove HTTP response headers, and flag responses that contain certain headers.

Trim

The Keep only the most recent # sessions box enables Fiddler to discard older sessions beyond the specified threshold.  This reduces memory usage and helps improve performance.