ASIHTTPRequest is a brilliant library, when you want to handle HTTP requests. At this time, however, this library doesn’t support OAuth. You can support it easily with OAuthCore library which is developed by atebits who is the developer of Tweetie a.k.a. Twitter for Mac/iPhone. atebits / OAuthCore / overview – Bitbucket A sample code is following. #import "OAuthCore.h" NSString * const CONSUMER_KE