DevHeader: Custom Headers & Redirect Rules

5.0(

12 ratings

)

Extension Developer Tools768 users

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Overview

Modify request/response headers, redirect URLs, and mock API responses by domain. Named profiles for dev, staging, and prod.

DevHeader is a minimal, local extension for web developers. Modify HTTP request and response headers, redirect URLs, and mock API responses, with no broad permissions and no remote calls. HEADERS - Set, append, or remove request and response headers - Scope rules to specific domains, or apply them globally - Toggle individual rules on and off without deleting them REDIRECTS - Rewrite request URLs with substring or regex find/replace - Live preview of the rewrite, with backreference support API MOCKING - Intercept fetch and XHR calls and return the status, body, and headers you define - Match REST requests by URL and GraphQL requests by operation name - Capture a real request in the DevTools panel and click Add to Mocks, or start from scratch - Edit the response as a form or raw JSON - Simulate 500 and 404 responses, or build a UI before the backend exists - Requires Chrome 138+ and the "Allow User Scripts" toggle on the extension's details page. Response delay simulation is not supported. PROFILES - Named profiles for dev, staging, and prod, with one-click switching - Export and import profiles PRIVACY AND SECURITY - No <all_urls> permission at install. Sites are granted one at a time at runtime - No network calls, no analytics, no remote code - Everything is stored locally in chrome.storage.local A safer alternative to ModHeader. Website: https://www.devheader.com Guide to mocking API responses: https://www.devheader.com/mock-api-responses-chrome Privacy policy: https://www.devheader.com/privacy

5 out of 5
12 ratings
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Details

Version
0.14.0
Updated
September 22, 2026
Flag concern
Offered by
devheader.extension
Size
406KiB
Languages
30 languages
Developer
Email
devheader.extension@gmail.com
Non-trader
This developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.

Privacy

Manage extensions and learn how they're being used in your organization

The developer has disclosed that it will not collect or use your data. To learn more, see the developer’s privacy policy.

This developer declares that your data is

Not being sold to third parties, outside of the approved use cases
Not being used or transferred for purposes that are unrelated to the item's core functionality
Not being used or transferred to determine creditworthiness or for lending purposes

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