httpclient
HTTPClient is a Ruby gem that provides a simple and flexible interface for making HTTP requests. It's a full-featured HTTP client library with support for cookies, redirects, proxy, and more. It's built on top of the libwww-perl library, which is a widely-used, robust and well-documented library.
Features:
- methods like GET/HEAD/POST/* via HTTP/1.1.
 - HTTPS(SSL), Cookies, proxy, authentication(Digest, NTLM, Basic), etc.
 - asynchronous HTTP request, streaming HTTP request.
 - debug mode CLI.
 - by contrast with net/http in standard distribution;
 - Cookies support
 - MT-safe
 - streaming POST (POST with File/IO)
 - Digest auth
 - Negotiate/NTLM auth for WWW-Authenticate (requires net/ntlm module; rubyntlm gem)
 - NTLM auth for Proxy-Authenticate (requires 'win32/sspi' module; rubysspi gem)
 - extensible with filter interface
 - you don't have to care HTTP/1.1 persistent connection (httpclient cares instead of you)
 
Example Use
require 'httpclient'
client = HTTPClient.new
# GET requests
response = client.get("http://httpbin.org/get")
puts response.content
# POST requests
data = { name: "value" }
response = client.post("http://httpbin.org/post", data)
puts response.content