MockHeader

Open-source header editor

Modify HTTP headers.

Set, append, or remove request and response headers in the browser. Rules stay on your machine.

Read the docs →
profile
Request
  X-API-Key          set     test
  Authorization      set     Bearer …

Response
  X-Frame-Options    remove

Filter
  host               example.com

What it changes

requestset / append / remove a request header
responsesame operations on the response
filterURL, tab, window, type, or time
redirectwildcard or regex rewrite

Local only

0
servers contacted
0
accounts or analytics
MIT
fork it
DNR
Chrome applies the rules
Privacy policy →

Load unpacked

Terminal
bun install
bun run build

Then Chrome → chrome://extensions → Developer mode → Load unpacked → output/chrome-mv3.