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Diff view lets you compare two captured flows side-by-side. You can spot differences in methods, URLs, status codes, headers, and bodies at a glance.

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Mark flows for comparison

  1. Navigate to the first flow in the flow list and press d to mark it.
  2. Navigate to the second flow and press d again.
httpmon opens the diff view automatically after you mark the second flow.

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What gets compared

The diff view shows a side-by-side comparison of:
  • Method and URL — See if the endpoints or HTTP methods differ
  • Status code — Compare response status codes
  • Headers — Spot added, removed, or changed headers
  • Bodies — Line-by-line diff of request and response bodies
For small bodies, httpmon shows a standard line-by-line diff with additions and removals highlighted. For large bodies (over 200 lines), httpmon switches to a sequential diff that keeps the view readable.
httpmon diff view

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When to use diff

  • Compare a request before and after a code change
  • Verify that a scripting hook modified the right headers
  • Check why two similar requests produce different responses