Validate the configuration of a debugging engine

There has been a problem connecting to your web server. Make sure that the URL (and port) are correct; these are provided to your web server either in the URL to validation script option or within your deployment.

The Path to create validation script within the local project does not map to the URL to validation script or Deployment URL option. If you are using a framework or the PHP built-in web server, this is likely due to the framework sending a 404 response instead of sending the actual file in that directory.

A quick way to test this is to create a test.php file in the directory you have set as the Path to create validation script, and then check that file is callable from the URL to validation script or deployment url with test.php appended.

For example, if the Path to create validation script is set to /var/www/public, create a test.php file with the following contents in that folder:

<?php echo 'test works';

If your URL to validation script or Deployment URL is http://192.168.100.100:8080, then you should be able to call that script by visiting http://192.168.100.100:8080/test.php and see the "test works" output. If you are seeing a 404 generated by your framework, then your URL rewriting is wrongly configured, and you should consult your framework's documentation to ensure that the URL rewriting configuration will return real files if they exist before sending any other requests to your framework dispatcher.

If you're seeing a 404 and you are using PHP built-in web server, it's likely because you cannot configure this web server to serve files on the file system if they exist. You'll need to add the following code to the file you are sending all requests to (typically index.php) in order to send file system files if they exist:

if (PHP_SAPI == 'cli-server') {
    // To help the built-in PHP dev server, check if the request was actually for
    // something which should probably be served as a static file
    $file = __DIR__ . $_SERVER['REQUEST_URI'];
    if (is_file($file)) {
        return false;
    }
}

The URL to validation script contains something different from localhost, but the xdebug.remote_host value is not set, and is therefore using the default value of localhost, or is set to localhost or 127.0.0.1.

The issue can happen in situations when the server document root is different from the project root, and deployment path mappings are not configured correspondingly.

Consider the following example:

• The project is stored in the /MyProject folder.

• The server document root is set to its public subfolder, that is /MyProject/public.

• The URL to access the application is http://MyApp.test.

If the entire project root folder is mapped to the server document root, PhpStorm will attempt to access the validation script via the http://MyApp.test/public/_intellij_phpdebug_validator.php URL, which will result in a 404 error. To solve this, you need to set the explicit mapping between the public subfolder and the server document root.