src/Routing/AbstractDispatcher.php
protected function allowed($method)
    {
        if (in_array($method, $this->allowed) === false) {
            $message = 'Used method is not allowed';

            throw new \UnexpectedValueException($message);
        }

        return true;
    }
protected function allowed($method)
    {
        if (in_array($method, $this->allowed) === false) {
            $message = 'Used method is not allowed';

            throw new \UnexpectedValueException($message);
        }

        return true;
    }
Checks if the specified method is a valid HTTP method.

@param  string $method
@return boolean

@throws UnexpectedValueException