POST Jquery AJAX错误500

Question

I have a strange problem. Yesterday everything worked fine.

I have a simple php file, as follows:

<?php

  if ($_SERVER['REQUEST_METHOD'] === 'POST') {

  echo json_encode(['messageType' =>
  'success','message'=>$_POST['key']);

  die();

  }

And js file with Ajax query:

$.ajax({

          dataType: "json",

           type: "POST",

          url: 'get.php',

          data: {key: 'a'},

          success: function(data) {

                  alert(data.message)

          },

          error: function(data) {

          alert ('error');}

      });

When the field 'key' is set to 1 character (eg. 'a'), I get an error 500 from the server. But if I change it to at least 3 characters everything works just fine.

The problem's begun occurring suddenly on several independent servers.

Answer 1

Error 500 means there should be something wrong with your PHP Endpoint. At first remove the semicolon and try if it works:

<?php
    if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    echo json_encode(['messageType' =>'success','message'=>$_POST['key']);
    die();
}