The AJAX request to send data to PHP is not functioning correctly

I have an issue where I am trying to send data to my server using AJAX in PHP. Even though I have set the method as POST, it seems to be executing as a GET request instead. Here is the code snippet:

$.ajax({
 type: 'POST',
 data: {
     user: user
 },
 url: url,
 crossDomain: true,
 contentType: "application/json; charset=utf-8",
 dataType: 'jsonp',
 success: function (data) {
     alert(data);
 },
 error: function (error) {
     alert(error)
 }
});

In PHP:

<?php
$user = $_POST["user"];
echo $user;
?>

However, changing $_POST to $_GET makes it work correctly. What could be causing this discrepancy between what I specify in the AJAX call and how the server processes the request?

Answer №1

There are a few issues that need to be addressed.

Firstly, the following line:

dataType: 'jsonp',

causes your request to be sent as a JSONP request. However, your response is not encoded as JSONP but rather as plain text, leading to an error. It is recommended to remove this line from your code.

Furthermore, when using PHP, it defaults to a content type of text/html. As you are directly outputting user input in your script, you are at risk for a potential XSS attack. To mitigate this risk, consider encoding your output as HTML using htmlspecialchars or specify that you are sending plain text:

header("Content-Type: text/plain");

In addition, the line:

contentType : "application/json; charset=utf-8",

indicates that you are sending JSON data in your HTTP request. However, you are actually sending

application/x-www-form-urlencoded
data and PHP does not automatically decode JSON formatted requests. It is advised to remove this line so that PHP can correctly populate $_POST with the data.

Keep in mind that when making a GET request, the data is encoded in the query string and the content type header is disregarded since there is no actual content to describe.

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