NSURLSessionDataTask返回不正确的结果

Question

我使用以下代码通过NSURLSession发布请求，但返回的结果不正确。但如果我用POSTMAN检查它有相同的参数和网址，那么它工作正常。请帮忙。

// URL of the endpoint we're going to contact.
NSURL *url = url;

// Create a simple dictionary with numbers.
NSDictionary *param = @{@"key1": @"value1"};

NSError *error = nil;
// Convert the dictionary into JSON data.
NSData *JSONData = [NSJSONSerialization dataWithJSONObject:param
                                                   options:kNilOptions error:&error];

// Create a POST request with our JSON as a request body.
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
request.HTTPMethod = @"POST";
request.HTTPBody = JSONData;

// Create a task.
NSURLSessionDataTask *task = [[NSURLSession sharedSession] dataTaskWithRequest:request
                                                             completionHandler:^(NSData *data,
                                                                                 NSURLResponse *response,
                                                                                 NSError *error)
                              {
                                  if (!error)
                                  {
                                      if (data) {
                                          json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
                                          success(json);

                                      }
                                      else {
                                          failure(error);
                                          NSLog(@"******************* error in sendRequestToServer");
                                      }
                                      //NSLog(@"Status code: %i", ((NSHTTPURLResponse *)response).statusCode);
                                  }
                                  else {
                                      failure(error);
                                      NSLog(@"******************* error in sendRequestToServer");
                                  }
                              }];

// Start the task.
[task resume];

Answer 1

我首先设置Content-Type标头。大多数服务器根据内容类型以不同方式处理POST请求，并且您不能设置一个。