Modify HTTP Request & Response Headers for Free
Manage Content-Security-Policy
Remove X-Frame-Options
Bypass CORS
Trusted by 300,000+ developers from Fortune 500 companies.
Modify HTTP Headers without limits
Add, remove, or override request and response headers directly in your browser. Debug faster, test smarter, and bypass restrictions — free & unlimited.
Remove X-Frame-Options
Bypass CORS & Security Restrictions
Authenticate API Requests
Insert Custom Headers
Collaboration & 1-Click Sharing
Popular Use Cases
Modify/ Bypass CORS
Bypass CORS errors during development by modifying response headers locally, without changing anything on the server.
Set Authorization Header
Inject auth tokens into request headers to test APIs without logging in or changing your code.
Modify Cookie Header
Add, modify, or remove Cookie headers in requests to fake sessions, test edge cases, or debug issues, no need to touch your browser storage.
More Features
More features for your testing needs
Built for teams
Effortless team collaboration
Secure and private
Enterprise-ready security and compliance
Loved by developers around the World
Developers around the world trust us to simplify debugging, speed up workflows, and make development more efficient.
Requestly is the first API client that has genuinely replaced Postman for me. Everything runs locally, so my API data never has to go through a cloud server. There’s no mandatory login, no unnecessary bloat, and no pressure to upgrade just to keep using the same workflow. It feels faster, simpler, and much more aligned with how developers actually want to work.
Postman stopped fitting the way our team works. We wanted our API collections in Git, not locked inside another tool. Requestly stores everything as plain JSON files in a local directory, which gives us full control over versioning, reviews, and collaboration.
After the recent pricing changes, Postman became much harder to justify for our small development team. Our workflow stayed exactly the same, but our costs increased significantly.
We started looking for alternatives and switched to Requestly because it’s free to get started and gives us everything we need to test APIs without forcing us onto a higher-priced plan.
My absolute favorite web debugging proxy and API client. I use it nearly every day for work to modify HTTP requests, test and mock API calls, inject JS snippets into sites, etc. The Requestly team is incredible — I once submitted a bug report and it was closed out within an hour. Also just kind, passionate people. I can't recommend Requestly enough.
Absolutely love the API Client feature! It’s like Postman, but better integrated into my daily workflow. Modifying API responses directly from the same tool I use for debugging is such a time-saver. Great job, Requestly team, for constantly innovating!
Modifying requests and/or responses is the killer feature area for me. Redirect JS in prod, generate mocks, modify headers, map local, map remote, SessionReplay, Load a local JS bundle, override scripts, etc. etc. etc. - TOTALLY worth it and very useful.
Requestly is an incredibly useful tool for developers working on a large team with multiple staging envs, or numerous app endpoints for various APIs in a local environment. The Sessions feature is especially useful for documenting solutions or sharing with others since it captures the relevant network traffic, and screen recording enables others to easily reproduce. Requestly combines all the power of complicated tools like Charles Proxy and Postman in one app/chrome extension. I highly recommend giving it a try if you haven't already–it will make your dev work so much easier. (Summarized)
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.
Frequently Asked Questions
There are frequently asked questions related to Requestly
Can I modify response headers for a URL that already has another rule applied?
Yes, you can. Requestly processes rules in a defined order, and the Modify HTTP Response Headers rule can still be applied even if the same URL is affected by other rules such as Redirect, Modify Request, or Modify API Response. This allows you to layer rules and test complex scenarios easily.
Can I modify CORS and CSP headers?
Yes, you can add, remove or modify CORS-related headers such as Access-Control-Allow-Origin, Content-Security-Policy, etc., to test cross-origin behavior in development.
Is Requestly open-source
Is Requestly free to use ?
Yes. Requestly offers a Free plan with essential features like unlimited header rules and standard HTTP modifications, perfect for getting started.
Does Requestly offer an enterprise plan?
Yes. Requestly offers an Enterprise Plan built for larger teams and organizations that need full control and compliance. It includes unlimited usage, API access, SSO & SAML, GDPR and SOC 2 compliance, user access management, SLAs for support and uptime, invoice-based billing, and priority support via Slack Connect, Email, and Chat.
Is Requestly free for students?
Yes! Requestly is free for students, enjoy access to powerful tools and features with no cost.
Why are my response header modifications not visible in the browser’s dev tools?
Why Aren’t My Requestly Rules Working?
How do I modify headers using Requestly?
Can I apply header modifications to specific HTTP methods (GET, POST, etc.)?
Yes, you can apply header modifications to specific HTTP methods by specifying the method condition within the rule settings. This ensures that headers are modified only for requests of certain types. For a detailed guide,.