PHP and C#communication error

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1

I’m trying to send a C# data to PHP, but the example I find and all solutions simply result in the same error. 

 using System.Net;
 using System.Collections.Specialized;

        string valor = "1";

        string urlAddress = "http://localhost:80/Untitled-1.php";

        using (WebClient client = new WebClient())
        {

            NameValueCollection postData = new NameValueCollection()
   {
          { "valor", valor}

   };


            client.UploadValues(urlAddress, postData);

        }

PHP code to receive data:

<html>

<?php
      $valor = $_POST["valor"];  

echo $valor;
 ?>

Error in PHP:

Notice: Undefined index: value in C: xampp htdocs Untitled-1.php on line 4

It’s a very simple code, but it’s the basis of a larger program. Does anyone have any idea what it might be?

php c#

  • Good evening, It may be that your php is not giving permission for external reading... Try assigning this at the top of your file: <?php header('Access-Control-Allow-Origin:*'); ? > Questions, I’m available.

  • Try to give a var_dump($_POST), if you do not give any value, it may be that your application c# is having some problem.

1 answer

1

I’m not sure, but I believe it’s for lack of defining the Content-Type of the request, thus:

using System.Net;
using System.Collections.Specialized;

string valor = "1";

string urlAddress = "http://localhost:80/Untitled-1.php";

using (WebClient client = new WebClient())
{
    client.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded";

    NameValueCollection postData = new NameValueCollection()
    {
         { "valor", valor }
    };

    client.UploadValues(urlAddress, postData);
}

This problem has nothing to do with Access-Control-Allow-Origin: *, the WebClient is not a site trying to access another, is a customer trying to access a site, so there is no cross-origin. Apply the header('Access-Control-Allow-Origin: *'); in PHP does not solve anything and even if it was a problem related to CORS you could not even get the error generated in PHP.

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