NSURLSession POST请求和GBK编码

    //1.构造URL
    NSURL *url = [NSURLURLWithString:@"http://localhost:8090"];    
    //2.构造Request
    NSMutableURLRequest *request = [NSMutableURLRequestrequestWithURL:url];    
    //(1)设置为POST请求
    [request setHTTPMethod:@"POST"];    
    //(2)超时
    [request setTimeoutInterval:60];
    //(3)设置请求头
    //[request setAllHTTPHeaderFields:nil];
    //(4)设置请求体
    NSString *bodyStr = @"id=test&pwd=test&cmd=1";
    NSData *bodyData = [bodyStr dataUsingEncoding:NSUTF8StringEncoding];
    //设置请求体
    [request setHTTPBody:bodyData];
    //3.构造Session
    NSURLSession *session = [NSURLSessionsharedSession];
    //4.task
    NSURLSessionDataTask *task =
     [session dataTaskWithRequest:request completionHandler:
       ^(NSData *data, NSURLResponse *response, NSError *error) {
        NSLog(@"response URL: %@", response.URL);
        NSLog(@"response Content Length: %lld", response.expectedContentLength);
        NSLog(@"response Encoding Name: %@", response.textEncodingName);
        NSLog(@"response MIME Type: %@", response.MIMEType);
        NSStringEncoding gbkEncoding =
         CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
        NSLog(@"response Content Data : %@",
         [[NSStringalloc] initWithData:data encoding:gbkEncoding]);
        NSHTTPURLResponse *responseHeader=(NSHTTPURLResponse*)response;
        NSLog(@"response Status Code : %ld", (long)responseHeader.statusCode);
        NSLog(@"response Header Data : %@", responseHeader.allHeaderFields);
    }];
    //5.执行
    [task resume];

输出：

2016-04-11 13:58:02.399 test[2614:146749] response URL: http://localhost:8090/
2016-04-11 13:58:02.400 test[2614:146749] response Content Length: 22
2016-04-11 13:58:02.400 test[2614:146749] response Encoding Name: gbk
2016-04-11 13:58:02.400 test[2614:146749] response MIME Type: text/html
2016-04-11 13:58:02.401 test[2614:146749] response Content Data : success:帐号验证通过！
2016-04-11 13:58:02.401 test[2614:146749] response Status Code : 200
2016-04-11 13:58:02.401 test[2614:146749] response Header Data : {
    Connection = close;
    "Content-Language" = "zh-CN";
    "Content-Length" = 22;
    "Content-Type" = "text/html; charset=gbk";
}