fixed

 * Option to set the SO_KEEPALIVE socket option to make libcurl notice and

   disconnect very long time idle connections.

 * When posting multipart forms, we should _not_ create the whole data chunk

   in memory before the upload starts but do it in a "streaming" manner to

   allow uploads that are way larger than the amount of system memory.

 LIBCURL - multi interface

 * Add curl_multi_timeout() to make libcurl's ares-functionality better.

 HTTP

 * GSS-Negotiate support for HTTP proxies. They only work on direct

   connections to the server.

 * Pipelining. Sending multiple requests before the previous one(s) are done.

   This could possibly be implemented using the multi interface to queue

   requests and the response data.