🏆 Requestly won #1 on ProductHunt!  Checkout our launch

Open Source
Open Source

Modify HTTP Request & Response Headers

Requestly is the most popular browser extension to modify HTTP request and response headers. Trusted by 200,000+ users, Requestly can help you add, remove or override HTTP headers.

Add to Chrome
Add to Safari
Add to Edge
Add to Firefox
Download for MacOS
Download for Windows
Download for Linux
Download for other platforms/browsers

Trusted by developers at

intuit
salesforce
indeed

Conditionally add or remove HTTP headers

Setup URL matching patterns to conditionally add, remove or override HTTP Request & Response headers.

Add HTTP Headers

Effortlessly add custom HTTP headers to your requests with a few simple clicks

Remove HTTP Headers

Remove headers from your HTTP request or response to test and debug

Override HTTP Headers

Override a header utilizing original request or response header values

What can you do with modifying headers

01

Manage Content-Security-Policy

Remove or Update the Content-Security-Policy HTTP header to enable script injection or third-party loading scripts.

02

Bypass CORS

Override CORS response headers with proper values to fix the CORS Issues in your local development & testing.

03

X-Frame-Options

Remove the X-Frame-Options response header on sites to enable embedding in Iframe.

04

Authenticate

Add or update authorization header and forward JSON Web Token to auto authenticate.

05

Insert Custom Headers

Insert custom HTTP request headers (e.g. x-userId) on your API endpoints

Additional Features

1-click options to setup Requestly in your daily workflow

Share Rule with others

Generate a public shareable link in 1-click or directly invite members in your team.

Selenium & Cypress Integration

You can use Requestly in your automation testing with Selenium & Cypress frameworks.

Advance filters

Advance conditions and filters allow you to target specific requests only.

Intercept & Modify HTTP Requests

Boost Your Web Development: Advanced Tools for Seamless Debugging.

Redirect URL (Map Remote)

Redirect a request URL  to another URL. e.g. Load local scripts in the production sites for faster debugging.

Override API Response

Test edge cases in your app by simulating API responses‍. Override XHR, fetch and AJAX responses.

Inject Custom Scripts

Add Custom JavaScript (JS) to Hide unwanted sections, add action buttons, inject your own libraries, etc.

Modify HTTP Headers

Add, Delete, Override Request & Response Headers. Can be used to remove X-Frame-Options, Content-Security-Policy, CORS Issues, etc.

Modify Query Params

Insert, Modify or Delete query parameters for URLs (or matching pattern). Burst cache for a request by assigning it a newer version.

Delay HTTP Requests

Simulate lag / delay to the response from specific URLs in a single click by using Requestly’s Delay Request Rule. No need to modify actual server.

For the developers, by the developers ❤️

From Debug to Deploy: Developers Trust Requestly

“Requestly has changed how we work for the better. By employing it to rigorously test our staging code on external websites, we've experienced a turbo-boost in our testing speed!״
Andres Velasco
Tech Lead | Making Science
“Requestly not just made it easier for us to develop, test & debug our code on our customer sites but It also helps us do engaging product demos to our prospective clients.״
Michael Levinson
Co-Founder & CPO | Joyned
“Requestly is awesome. I used to use Charles proxy in my day to day work but it always messed with my wifi. I haven't had any issues with Requestly. Requestly's UI is amazing too and great to work in.״
Carl Hand
Senior Software Engineer | Workday
“I'm a big fan of Requestly, and use it on a daily basis as a QA Engineer. It removes the need to use Charles pretty often, which is always nice. I can just use Requestly directly in Chrome״
Mike Mitchell
QA Engineer | Clayton Homes

More Awesome Features

An open-source platform that speeds up your web development cycle 10X faster.

Session Recording

Data rich bug reporting with Network logs, Console logs, Session Video and environment details. Share it with your Engineering team for faster debugging.

Add to Chrome
Add to Edge
Add to Firefox
Add to Safari
Download for other platforms/browsers
Mock API Server

Generate custom API responses without actually having a pre-built API or a backend server. Edit Content-Type, Status Code, Headers, and Response body easily on the Mock Server.

Add to Chrome
Add to Edge
Add to Firefox
Add to Safari
Download for other platforms/browsers
Web-based API Client

A comprehensive and web-based tool for modifying and testing APIs. You can test the Mock APIs you’re creating here to fast track your development lifecycle.

Add to Chrome
Add to Edge
Add to Firefox
Add to Safari
Download for other platforms/browsers