Delphi Cookbook - Third Edition

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The TNetHTTP* components are a must if you want to build HTTP-enabled applications, especially on mobile, so you have to know them. Play with them, use them; if you have HTTP-enabled apps using INDY, consider switching to TNetHTTPClient; you will simplify deployment and development and take advantage of the deeper integration with the OS.

Here's a well-written document about the TNetHTTP* components directly from Embarcadero's WikiDoc:

• Using an HTTP client: http://docwiki.embarcadero.com/RADStudio/en/Using_an_HTTP_Client