libsoup

SoupAddress - Higher-level IP address object
SoupAuth - HTTP Authentication support
SoupConnection - a single possibly-persistent HTTP connection
SoupConnectionNTLM - NTLM-authenticated connection
soup-dns - Low-level DNS routines
SoupMessage - An HTTP request and response.
SoupServerMessage - Server-side SoupMessage
SoupServer - HTTP server
SoupSession - Soup session state object
SoupSessionAsync - Soup session for asynchronous (main-loop-based) I/O.
SoupSessionSync - Soup session for blocking I/O in multithreaded programs.
SoupSoapMessage - A SOAP request/response
SoupSocket - a network socket
soup-ssl - SSL/TLS handling
soup-status - HTTP and Soup status codes
soup-uri - URIs