Question

When server return any error (401, 405, etc.), fopen return invalid.
Is there a way to receive the body of the response?

Answer 1

Use a context (via stream_context_create) and the ignore_errors context option, that “Fetch the content even on failure status codes.“:

$options = array(
    'http' => array(
        'ignore_errors' => true,
    ),
);

$context = stream_context_create($options);

$handle = fopen('http://url/', 'r', false, $context);