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Description
Modify request & response HTTP headers and redirect URLs per domain. Multiple named profiles for dev, staging, and prod. DevHeader lets you add, edit, enable/disable, and remove HTTP request and response headers, and redirect request URLs, for the websites you choose. FEATURES • Set, append, or remove both request and response headers • Redirect request URLs via substring or regex find/replace, with a live preview • Scope rules to specific domains, or apply globally when no domain is set • Narrow any rule to specific resource types or request methods • Toggle rules on/off without deleting them, and reorder them with one click • Autocomplete for common header names and values as you type • Quick-add presets: CORS "Allow All", structured CSP / Permissions-Policy builders, and a Set-Cookie/Cookie attribute builder • Named profiles: separate domains and rules per profile, with a one-click switcher and a master enable/disable toggle • Duplicate, export, and import profiles as JSON, individually or in bulk • Built on Manifest V3 declarativeNetRequest - no blocking webRequest, no background snooping WHY DEVHEADER Built as a minimal, auditable alternative after a popular header-modification extension was pulled from the Edge store for containing dormant domain-harvesting code. DevHeader only requests host permission for the domains you approve, makes no network calls of its own, and ships no remote or dynamically fetched code - the entire codebase is small enough to read end to end. PERMISSIONS • storage: save your header rules, redirect rules, profiles, and domain list locally • declarativeNetRequest: apply header and redirect rules to matching requests • permissions: request host access only for domains you approve, one at a time No <all_urls> access. No data ever leaves your machine. SUPPORT Found a bug or want a feature? https://www.devheader.com/contact