PHP5 rewrite of HTTP_Request package (with parts of HTTP_Client). Provides
cleaner API and pluggable Adapters:
* Socket adapter, based on old HTTP_Request code,
* Curl adapter, wraps around PHP's cURL extension,
* Mock adapter, to use for testing packages dependent on HTTP_Request2.
Supports POST requests with data and file uploads, basic and digest
authentication, cookies, managing cookies across requests, proxies, gzip and
deflate encodings, redirects, monitoring the request progress with Observers...