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.
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Conditionally add or remove HTTP headers
Setup URL matching patterns to conditionally add, remove or override HTTP Request & Response headers.
What can you do with modifying headers
1-click options to setup Requestly in your daily workflow
Intercept & Modify HTTP Requests
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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.
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.