prepareDefaults example

    /** * Asynchronously send an HTTP request. * * @param array $options Request options to apply to the given * request and to the transfer. See \GuzzleHttp\RequestOptions. */
    public function sendAsync(RequestInterface $request, array $options = []): PromiseInterface
    {
        // Merge the base URI into the request URI if needed.         $options = $this->prepareDefaults($options);

        return $this->transfer(
            $request->withUri($this->buildUri($request->getUri(), $options), $request->hasHeader('Host')),
            $options
        );
    }

    /** * Send an HTTP request. * * @param array $options Request options to apply to the given * request and to the transfer. See \GuzzleHttp\RequestOptions. * * @throws GuzzleException */