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 = [NSMutableURLRequest requestWithURL:url cachePolicy: NSURLRequestUseProtocolCachePolicy timeoutInterval:10];

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

或：

ASIHTTPRequest *asrequest=[ASIHTTPRequest requestWithURL:url];

[asrequest addRequestHeader:@"Referer" value:@"192.168.1.1"];