DHC (Dev HTTP Client) – Google Chrome extension to discover, manipulate, & test HTTP REST services

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From the DHC Chrome Web Store page:

Easily construct custom HTTP requests, save them permanently, take advantage of variables and contexts.

DHC (aka Dev HTTP Client) is designed and developed by a developer for developers to make direct HTTP resource discovery, manipulation and testing more easily. Beside the main function, sending/receiving custom HTTP requests/responses, it allows permanently to save a request to a local repository for later reuse and moreover the request declaration can include variables that are context specific. With the use of contexts you can easily switch between various environments without modifying request declaration. (e.g. from a test environment to production)