iphone发起http请求源码

做工程之余，将做工程过程较好的代码做个备份，下面的代码段是关于iphone发起http请求的代码，希望能对各位有一些用处。

[request setURL:[NSURL URLWithString:urlString]];
[request setHTTPMethod:@"POST"];

[request addValue:contentType forHTTPHeaderField: @"Content-Type"];

[postBody appendData:[[NSString stringWithFormat:@"<xml>"] dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[[NSString stringWithFormat:@"<yourcode/>"] dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[[NSString stringWithFormat:@"</xml>"] dataUsingEncoding:NSUTF8StringEncoding]];

[request setHTTPBody:postBody];

NSLog(@"Response Code: %d", [urlResponse statusCode]);
if ([urlResponse statusCode] >= 200 && [urlResponse statusCode] < 300) {
    NSLog(@"Response: %@", result);

}