How to retrieve a remote page using WordPress

Just use the wp_remote_get() function (Or wp_remote_post() is you prefer using the POST method) to retrieve the desired url. The example below shows how to retrieve an url and display its content as well as the file info.

This code can be used anywhere on your template files.

$response = wp_remote_get( 'http://foo.com/file.txt' );
if( is_wp_error( $response ) ) {
   echo 'Something went wrong!';
} else {
   echo 'Response:<pre>';
   print_r( $response );
   echo '</pre>';
}

Credits: WordPress Codex.

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