ios request payload

NSMutableURLRequest *request = 
[manager.requestSerializer requestWithMethod:@"POST" 
URLString:[[NSURL URLWithString:<url string>] 
absoluteString] parameters:parameters];

[request setHTTPBody:[self.POSTHttpBody 
dataUsingEncoding:NSUTF8StringEncoding]];
__block NSURLSessionDataTask *task = [manager 
dataTaskWithRequest:request 
completionHandler:^(NSURLResponse * __unused 
response, id responseObject, NSError *error) {
if (error) {
   // error handling
} else {
    // success
  }
}];

[task resume];

//本文转载于：https://stackoverflow.com/questions/19712612/how-to-set-http-request-body-using-afnetworks-afhttprequestoperationmanager