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Editing: Guzzle6HttpHandler.php

<?php
/**
 * Copyright 2015 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
namespace Google\Auth\HttpHandler;

use GuzzleHttp\ClientInterface;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;

class Guzzle6HttpHandler
{
    /**
     * @var ClientInterface
     */
    private $client;

/**
     * @param ClientInterface $client
     */
    public function __construct(ClientInterface $client)
    {
        $this->client = $client;
    }

/**
     * Accepts a PSR-7 request and an array of options and returns a PSR-7 response.
     *
     * @param RequestInterface $request
     * @param array<mixed> $options
     * @return ResponseInterface
     */
    public function __invoke(RequestInterface $request, array $options = [])
    {
        return $this->client->send($request, $options);
    }

/**
     * Accepts a PSR-7 request and an array of options and returns a PromiseInterface
     *
     * @param RequestInterface $request
     * @param array<mixed> $options
     *
     * @return \GuzzleHttp\Promise\PromiseInterface
     */
    public function async(RequestInterface $request, array $options = [])
    {
        return $this->client->sendAsync($request, $options);
    }
}

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