
Requestly
modheader
Header Editor
RequestHeaders.com
VibeHeader
HTTP Header Live
Modify Header Value (HTTP Headers)
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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Website, pricing, platforms and company facts side by side.
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| Website | headerflex.app | nocodeflow.net |
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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.
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HTTP Header Checker Tools
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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.
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Displays the HTTP header. Edit it and send it.
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