Make the web
work your way.
Change a HTTP request/response header. Redirect a request. Switch environments.
A little more control, right where you browse.
Add to Google Chrome 
01 — CAPABILITIES
Small extension.
Considerable control.
For the quick fixes, the tricky bugs,
and the setups you come back to.
Every header, handled.
Set, append, or remove request and response headers. Test authentication, feature flags, and CORS without touching your application.
Point it somewhere better.
Send an API to localhost, redirect an asset to staging, or block a noisy request. Allow traffic and upgrade HTTP to HTTPS, too.
Only where you need it.
Target URLs, regex, domains, request methods, and resource types. Get specific with individual tabs and tab groups.
Switch contexts. Keep your setup.
Organize rules into reusable profiles. Switch environments with radio groups, combine profiles with checkbox groups, and pause or resume them together.
Let your session keep up.
Append a selected browser cookie to matching requests and keep its value in sync as it changes. Cookie access is enabled only when you grant permission.
Keep it. Share it. Reuse it.
Back up profiles as JSON or pass a setup along with a share link. Synchronized cookie values are cleared from exports and shared profiles.
A setup that stays with you.
Profiles and settings are stored locally in your extension. Headerly does not automatically upload them.
The browser does the work.
Rules run through the browser’s built-in engine. Headerly does not proxy traffic or read request and response bodies.
YOURS TO CONFIGURE
Also for Microsoft Edge