The HTTP interceptor you install without reading the permissions policy.
Redirect requests, rewrite headers, unblock CORS and mock responses — in the browser, on your machine. No account. No cloud. Nothing leaves the device unless you ask it to.
Every rule type, no limits, on the free tier
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Redirect
Send a request somewhere else, or swap out its host.
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Headers
Add, replace or remove request and response headers.
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Block
Cancel a request before it leaves the browser.
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Query
Add, replace or strip URL query parameters.
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CORS
Spoof the origin and return permissive CORS headers. No backend needed.
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Cookie
Create, change or delete cookies by pattern.
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Script
Inject JavaScript or CSS into matching pages.
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Mock
Replace or patch a response body, override the status, or add a delay.
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WebSocket
Drop, replace or patch WebSocket messages as they pass through.