<?php
namespace GuzzleHttp;

use GuzzleHttp\Exception\GuzzleException;
use GuzzleHttp\Promise\PromiseInterface;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\UriInterface;

/**
* Client interface for sending HTTP requests.
*/
interface ClientInterface
{
/**
* @deprecated Will be removed in Guzzle 7.0.0
*/
const VERSION = '6.5.5';

/**
* Send an HTTP request.
*
* @param RequestInterface $request Request to send
* @param array $options Request options to apply to the given
* request and to the transfer.
*
* @return ResponseInterface
* @throws GuzzleException
*/
public function send(RequestInterface $request, array $options = []);

/**
* Asynchronously send an HTTP request.
*
* @param RequestInterface $request Request to send
* @param array $options Request options to apply to the given
* request and to the transfer.
*
* @return PromiseInterface
*/
public function sendAsync(RequestInterface $request, array $options = []);

/**
* Create and send an HTTP request.
*
* Use an absolute path to override the base path of the client, or a
* relative path to append to the base path of the client. The URL can
* contain the query string as well.
*
* @param string $method HTTP method.
* @param string|UriInterface $uri URI object or string.
* @param array $options Request options to apply.
*
* @return ResponseInterface
* @throws GuzzleException
*/
public function request($method, $uri, array $options = []);

/**
* Create and send an asynchronous HTTP request.
*
* Use an absolute path to override the base path of the client, or a
* relative path to append to the base path of the client. The URL can
* contain the query string as well. Use an array to provide a URL
* template and additional variables to use in the URL template expansion.
*
* @param string $method HTTP method
* @param string|UriInterface $uri URI object or string.
* @param array $options Request options to apply.
*
* @return PromiseInterface
*/
public function requestAsync($method, $uri, array $options = []);

/**
* Get a client configuration option.
*
* These options include default request options of the client, a "handler"
* (if utilized by the concrete client), and a "base_uri" if utilized by
* the concrete client.
*
* @param string|null $option The config option to retrieve.
*
* @return mixed
*/
public function getConfig($option = null);
}