在做某些特殊行业应用时会遇到图片或者文章防盗链问题。可在request中加如Referer头+server地址

比如：NSMutableURLRequest *theRequest = [NSMutableURLRequestrequestWithURL:url cachePolicy: NSURLRequestUseProtocolCachePolicy timeoutInterval:10];

[theRequest  addVaule:@"192.168.1.1"  forHTTPHeaderField:@"Referer"];

或：

ASIHTTPRequest *asrequest=[ASIHTTPRequestrequestWithURL:url];

[asrequestaddRequestHeader:@"Referer"value:@"192.168.1.1"];