Requestly
modheader
VibeHeader
Header Override
HeaderFlex.app
Live HTTP Headers
Modify Header Value (HTTP Headers)
Add custom HTTP request headers to any site. Set Authorization tokens, override Content-Type, inject debug headers per URL pattern. declarativeNetRequest. Free: 5 rules, Pro: unlimited.

An online tool to create instructions and user manuals for providing quality customer care

Website, pricing, platforms and company facts side by side.
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Header Editor
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| Website | dev-tools-hub.xyz | objects.to |
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When comparing Header Editor and Objects, you can also consider the following products.

Free browser extension to modify HTTP request and response headers. No sign-up. Works on Chrome, Firefox, and Edge.
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An open-source ModHeader alternative trusted by 10,000+ developers. Edit and share headers with Profiles, URL filters, and a built-in tester.
Compare VibeHeader to Header Editor or Objects:

Open-source Chrome, Firefox, and Edge extension to modify HTTP request and response headers, cookies, and local profiles for API debugging.
Compare Header Override to Header Editor or Objects:

A local-first ModHeader alternative: rewrite HTTP request & response headers via Chrome's native declarativeNetRequest. No backend, no account, no telemetry.
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The goal of this project is to adds information about the HTTP headers in three ways:
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