POST request, not sending anything, isset($_POST) always false

Question

I am new to C#. I tried all solutions to other questions and still i can't find what is wrong. My code is common in other answers but it seems to never send anything. I have tried in my own server and the company i'm working for server. I know this kind of answer has been answered many times before, but maybe i am missing something like others so this might be useful to someone besides me.

C# code:

       var buttonSaveClicked = new MouseEventHandler((o, a) =>
        {
            var user_token = this.textApiKey.Text;

            if (user_token.Length == 0) MessageBox.Show("API Key cannot be empty!", "API Key Error", MessageBoxButtons.OK, MessageBoxIcon.None);

            var httpWebRequest = (HttpWebRequest) WebRequest.Create("http://localhost/networksWindows.php");
            httpWebRequest.ContentType = "application/json; charset=utf-8";
            httpWebRequest.Method = "POST";

            using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
            {
                string json = "{\"user_token\": \"batatas\", \"bata\": \"cook\"}";

                System.Diagnostics.Debug.WriteLine(json);

                streamWriter.Write(json);
                streamWriter.Flush();
            }

            var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
            using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
            {
                var result = streamReader.ReadToEnd();
                System.Diagnostics.Debug.WriteLine(result);
                User user = JsonConvert.DeserializeObject<User>(result);

                if (user.status == "error") MessageBox.Show("Invalid API Key. Please make sure you have generated a API key and insert it correctly.", "API Key Error", MessageBoxButtons.OK, MessageBoxIcon.None);
                else if (user.status == "success")
                {
                    System.Threading.Thread t = new System.Threading.Thread(new System.Threading.ThreadStart(ThreadProc));

                    t.Start();

                    this.Close();
                }
            }

        });

PHP script in my server:

<?php

$json = null;

if (isset($_POST['user_token']))
{
$json = $_POST['user_token'];

echo "user";
}

?>

Answer 1

You have to decode your json post in PHP. Try using this:

$json = json_decode($_POST);
if (isset($json['user_token']) {
  $userToken = $json['user_token'];
}

Answer 2

If you want $_POST to understand your data, it has to be sent as form-encoded key=value&key2=value2 , not as JSON.

If you want to post JSON, you need to decode it on server side:

$post = (array)json_decode(file_get_contents("php://input"));
if (isset($post['user_token'])) {
    // ...
}

You can replace file_get_contents("php://input") with $HTTP_RAW_POST_DATA , but its availability depends on configuration.

PS streamWriter.Flush() call is redundant.

Answer 3

将您的json解码为数组：

$json = json_decode($_POST, true);