NSString* urlStr = @";

NSURL* url = [NSURL URLWithString:urlStr];

NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:url];

request.HTTPMethod = @"POST";

[request addValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];

NSString *postStr = @"";

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

NSURLSessionConfiguration* config = [NSURLSessionConfiguration defaultSessionConfiguration];

NSURLSession* session = [NSURLSession sessionWithConfiguration:config];

NSURLSessionDataTask* dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {

    if (error == nil) {

    }

}];

[dataTask resume];

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