NSMutableURLRequest*request=[[NSMutableURLRequestalloc]initWithURL:[NSURLURLWithString:url]];
request.HTTPMethod=@"POST";
NSString*postStr = [parametersobjectForKey:@"postString"];
request.HTTPBody=[postStr dataUsingEncoding:NSUTF8StringEncoding];
request.timeoutInterval=40;
//请求头
[request setValue:@"application/xml;charset=utf-8"forHTTPHeaderField:@"Content-Type"];
NSURLSession*session = [NSURLSessionsharedSession];
NSURLSessionDataTask*dataTask = [sessiondataTaskWithRequest:requestcompletionHandler:^(NSData*_Nullabledata,NSURLResponse*_Nullableresponse,NSError*_Nullableerror) {
if(error) {
//请求失败
}else{
//请求成功
}
}];
[dataTaskresume];//开始请求
