AfNetworking 2.0 posting issue - php

Question

i have recently wanted to use Afnetworking in my ios application. the same page responds me by using ASIHTTPREQUEST. but it simply does not with the AFNetworking. Here is my effort.
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
NSDictionary *params = #{#"user[height]": #"10",
#"user[weight]": #"255"};
[manager POST:#"http://localhost:8888/TestingPost/post.php" parameters:params success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSLog(#"JSON: %#", responseObject);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(#"Error: %#", error);
}];
Now i have tried many options like adding serialization to different xml / json / html. but of no use.
On PHP page i am not doing something fancy just printing out whatever is posted on the page. still here it is.
<?php
// Show all information, defaults to INFO_ALL
header('Content-type: application/JSON');
print_r($_POST[]);
/*
$first_name = $_POST["first_name"];
$last_name = $_POST["last_name"];
$password = $_POST['password'];
*/
//echo( "hurray");
?>
Can you please shed some light on it. i want to switch from ASIhttprequest to newest and more supported.
Here is the result for the request
Networking_example[1777:41979] Error: Error Domain=com.alamofire.error.serialization.response Code=-1011 "Request failed: internal server error (500)" UserInfo=0x7f9feae16d60 {com.alamofire.serialization.response.error.response=<NSHTTPURLResponse: 0x7f9fedb029a0> { URL: http://localhost:8888/TestingPost/post.php } { status code: 500, headers {
Connection = close;
"Content-Length" = 0;
"Content-Type" = "text/html";
Date = "Thu, 16 Oct 2014 18:08:08 GMT";
Server = Apache;
"X-Powered-By" = "PHP/5.5.10";
} }, NSErrorFailingURLKey=http://localhost:8888/TestingPost/post.php, com.alamofire.serialization.response.error.data=<>, NSLocalizedDescription=Request failed: internal server error (500)}

Answer 1

If your PHP is using $_POST, that means that you are ok using the default requestSerializer of AFHTTPRequestSerializer (i.e. an application/x-www-form-urlencoded request).
But your JSON is not generation JSON response, so you have to change the responseSerializer to AFHTTPResponseSerializer.
manager.responseSerializer = [AFHTTPResponseSerializer serializer];
And your PHP page is reporting a 500 error. That is an "Internal Server Error", for which the status code definition says:
The server encountered an unexpected condition which prevented it from fulfilling the request.
That suggests a PHP error. Perhaps you intended:
print_r($_POST);
Generally, when interacting with web service, it's better to generate JSON response, e.g.
echo(json_encode($_POST));
Obviously, if you generate JSON response, you might also want to use the default [AFJSONResponseSerializer serializer] setting, rather than changing it to AFHTTPResponseSerializer.