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Description
Modify headers, cookies, redirects, and request filters in reusable profiles. M Header helps developers edit HTTP request and response headers, test cookies, and redirect matching requests from a compact browser workspace. Control headers • Set, append or remove request and response headers, subject to Chrome's supported operations. • Test headers such as Accept-Language, Cache-Control and custom debugging headers. • Use save-time variables such as {{uuid}} and {{timestamp}} in values. Choose where rules apply • Match URLs with contains patterns or regular expressions. • Include or exclude request domains and tab domains. • Filter by HTTP request method and resource type. • Limit configurations to a tab, tab group or window. Test cookies, policies and redirects • Configure individual request cookies and Set-Cookie responses. • Edit Content Security Policy directives. • Redirect matching source URLs to a specified destination, including regex-based redirects. Keep configurations organized • Create, name, duplicate, reorder and enable or disable multiple profiles. • Undo and redo edits, or schedule a profile to turn off automatically. • Save edits automatically and inspect the compiled rules. • Export configurations to JSON, then import them by replacing or merging profiles. • Keep configurations local by default, with optional browser profile synchronization through Chrome storage sync. Use M Header for API debugging, localization checks, cache testing and repeatable development configurations. Start with a profile, add a modification, then choose the requests it should affect. The extension interface is in English. Header and redirect behavior follows Chrome's extension API restrictions.