NSData返回0个字节

时间:2016-02-25 02:17:29

标签: ios json nsdata nsurlsessiondatatask

我正在尝试做一个简单的POST请求。但是在chrome和iOS模拟器中的POSTMAN插件中结果似乎不同。

以下是POSTMAN的快照:

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如您所见,我在重新调整时获得了JSON数据。

这是我执行POST请求的代码:

    NSError *error;
    NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
    NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:nil];
    NSURL *url = [NSURL URLWithString:kPostURL];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url
                                                           cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                       timeoutInterval:60.0];

    [request addValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [request addValue:@"application/json" forHTTPHeaderField:@"Accept"];

    [request setHTTPMethod:@"POST"];


    NSString *params =[[NSString alloc] initWithFormat:@"fname=%@&lname=%@&email=%@&password=%@&switchid=%d&didflag=%@",fname,lname,email,pass,switchid,flag];

    [request setHTTPBody:[params dataUsingEncoding:NSUTF8StringEncoding]];
    NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {

        NSLog(@"response is %@",response);
        NSLog(@"erros is %@",error);

        NSMutableDictionary * innerJson = [NSJSONSerialization
                                           JSONObjectWithData:data options:kNilOptions error:&error
                                           ];
        NSLog(@"JSON data is %@",innerJson);

    }];

    [postDataTask resume];

当我尝试在调试器中打印值时,我得到了

JSONnullNSData0 bytes。但我得到status code as 200这是成功的。

HEre是我得到的回应:

      { status code: 200, headers {
    Connection = "Keep-Alive";
    "Content-Length" = 0;
    "Content-Type" = "text/html";
    Date = "Thu, 25 Feb 2016 02:04:02 GMT";
    "Keep-Alive" = "timeout=5";
    Server = "Apache/2.4.12";
    "X-Powered-By" = "PHP/5.5.30";
} }

为什么我将NSData作为0字节?

1 个答案:

答案 0 :(得分:1)

在chrome中的请求中,您将参数作为URL参数。在ObjC版本中,您将params作为帖子的一部分添加。

而不是将params作为身体的一部分添加:

[request setHTTPBody:[params dataUsingEncoding:NSUTF8StringEncoding]];

将其添加为查询的一部分:

NSURL *url = [NSURL URLWithString:[kPostURL stringByAppendingFormat:@"?%@", params]];