HttpRequester is described as 'tool for Firefox for easily making HTTP requests (GET/PUT/POST/DELETE), viewing the responses, and keeping a history of transactions' and is a HTTP Client in the Development category. There are more than 25 alternatives to HttpRequester for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and Google Chrome. The best alternative is Insomnia REST Client, which is both free and Open Source. Other great apps like HttpRequester are Postman (Freemium), Fiddler (Freemium), Paw (Paid) and Hoppscotch (Free, Open Source).
Postman is a tool that facilitates the development and use of APIs. Postman provides all the functionality needed to create or simulate API specifications and use the Postman Collection Runner to create tests.
Fiddler is a Web Debugging Proxy which logs all HTTP(S) traffic between your computer and the Internet. Fiddler allows you to inspect all HTTP(S) traffic, set breakpoints, and "fiddle" with incoming or outgoing data.
Easily craft your HTTP requests, try them, archive them. Setup HTTP Headers, URL parameters, form-encoded POST key-values or text. Get easy-to-read responses with well formatted headers and body. Sync your projects with your team through Paw for Teams.