Apps similar to OpenHeader include Requestly, which is open source with a free version. Other options are Live HTTP Headers, Header Override, Header Editor and VibeHeader. In total there are six Web Debuggers like OpenHeader for Mac, Windows, Linux and the web.
Requestly is a lightweight proxy available as a browser extension & desktop app to intercept & modify network requests. Using Requestly you can Modify Headers, Redirect Url, Mock API response, Delay/Throttle requests, etc.
United States
The goal of this project is to adds information about the HTTP headers in three ways:
Canada
Header Override lets you modify or inject HTTP headers and cookies to customize web requests and responses.
Ukraine
Header Editor lets developers add, modify, or remove HTTP request headers per URL pattern using Chrome's MV3 declarativeNetRequest — no response-body access, rules stay local.
Japan
Open-source Chrome extension to add & modify HTTP request headers and share configs in one click. A lightweight ModHeader alternative — no ads, no tracking.
ModHeader is a powerful browser extension that provides users with complete control over HTTP(S) headers. By allowing you to modify, add, or remove headers in a simple and user-friendly interface.
Japan
