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.

4.8 ⭐ 1,000+ reviews , 200,000+ developers

Download for other platforms

Other Browser Extensions

Desktop Clients

Trusted by developers at

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.

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.

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.

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.

Download for other platforms/browsers

For the developers, by the developers ❤️

From Debug to Deploy: Developers Trust Requestly

Awesome tool. I use it almost daily for my projects to modify request body, headers, etc. Would recommend it to every frontend developer out there. Thank me later 🙂 (Case Study)

Harsh Vats

Frontend Engineer at PingSafe

This is by far the best tool for managing request headers! Plus the developers are very active meaning you’ll get help if you’re ever stuck or need help solving a problem. I use it daily and couldn’t be happier.

Jose Browne

Senior Engineer at Reddit

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 an amazing tool and great to work in.

Carl Hand

Senior Software Engineer at Workday

Requestly not just made it easier for us to develop, test & debug our code on our customer sites but also helped us do engaging product demos to our prospective clients.

Michael Levinson

Co-Founder & CPO at Joyned

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 Proxy often, which is always nice. I can just use Requestly directly in Chrome

Mike Mitchell

QA Engineer at URBN

App works as expected! Ran into some small issues while creating the rules but the support team was able to help and overcome those.

José Miguel Dias Fernandes

Development Lead at Vodafone

Requestly is user-friendly, brilliant and easy-to-use. I use it on an daily basis and it makes my work easier. After using other tools like Charles – Requestly is a nice new breath of air that I highly vouch for. Apart from the tool being amazing – the support from the Requestly team is phenomenal with them always going above and beyond for their clients.

Marius Ludick

Solutions Architect II at Amazon

Requestly is an amazing tool to get your development work less hassle. The product itself has evolved so much since day-1 and the company is really serious on helping their customer solves their problems. We had this nice session where they shared Requestly features and we were very impressed on its potential. A truly 5-star worthy.

Natchapol Thongruang

Senior Software Engineer at Agoda