Symfony2 : send a HTTP Request

问题:

I am trying to make a HTTP Request from one of my controller to contact another URL, the goal being to contact another URL, and to simply print the HTML answer in my page. I tried :

$r = new Request();
$r->create('http://www.google.com', 'GET');

return $this->render(...mytemplate..., array('name' => $r->getContent());

My template is simply printing the variable "name".
Now when I do that, nothing is returned. It seems to me that the request is never sent, which is why nothing is returned.

My question is : how do I send the request and get the content of the response?

Thanks in advance.

回答1:

EDIT: I made a GremoBuzzBundle for Buzz browser. It's similar to SensioBuzzBundle but it has some nice configuration options.

I would suggest to use Buzz browser and dependency injection. Buzz is a wrapper around cURL or file_get_contents. Edit your deps file adding these lines:

[Buzz]
    git=https://github.com/kriswallsmith/Buzz.git
    target=/buzz

Then install vendors to actually download the library:

php bin/vendors install

Then add two services (src/YourCompany/YourBundle/Resources/config/services.yml):

# cURL client for Buzz
buzz.client.curl:
  class:  Buzz\Client\Curl
  public: false
  calls:
    - [setVerifyPeer, [false]]

# Buzz browser
buzz.browser:
  class:     Buzz\Browser
  arguments: ['@buzz.client.curl']

The first service is the client (i prefer cURL over file_get_contents), the latter is the browser itself. The last step is to add one line of code in the autoloader (app/autoload.php):

$loader->registerNamespaces(array(
    'Buzz' => __DIR__.'/../vendor/buzz/lib',
));

Then you can get the service and user the browser in your controller code:

$browser = $this->get('buzz.browser');
$response = $browser->get('http://www.google.com');

回答2:

Two problems.

First of all, that's not the proper usage of Symfony\Component\HttpFoundation\Request::create(), which is a static initializer/factory of sorts. Your code should look like this

$r = Request::create( 'http://www.google.com', 'GET' );

Now you have a proper Request object. However, this is irrelevant which is your second problem: that's not how Symfony's request object is designed to work. Its purpose is not for executing HTTP requests, its for representing them as objects in the framework.

Long story short, you can't do it that way. Perhaps you can use cURL to scrape the page you want?

回答3:

Why not use curl? From PHP manual

$ch = curl_init("http://www.example.com/");

curl_setopt($ch, CURLOPT_FILE, $fp);
curl_setopt($ch, CURLOPT_HEADER, 0);

result = curl_exec($ch);
curl_close($ch);

回答4:

I would recommend you using GuzzleHttp Client - best client that I know: http://docs.guzzlephp.org/en/latest/

There is already nice bundle that integrates it into Symfony2 project: https://github.com/8p/GuzzleBundle

Then from your controller you can call:

$client   = $this->get('guzzle.client');

// GET request with parameters
$response = $client->get('http://httpbin.org/get', [
    'headers' => ['X-Foo-Header' => 'value'],
    'query'   => ['foo' => 'bar']
]);
$code = $response->getStatusCode();
$body = $response->getBody();

More info can be found on: http://docs.guzzlephp.org/en/latest/index.html

回答5:

Apparently, you can use Symfony's built-in HTTP client. See: http://api.symfony.com/2.0/Symfony/Component/HttpKernel.html

The following is a very crude codebase, using Silex (built on top of Symfony). It simply instantiates a new HTTP client.

<?php
require_once __DIR__ . '/silex/vendor/autoload.php';

use Symfony\Component\EventDispatcher\EventDispatcher;
use Symfony\Component\HttpKernel\Controller\ControllerResolver;
use Symfony\Component\HttpKernel\HttpKernel;
use Symfony\Component\HttpKernel\Client;
//use Symfony\Component\HttpFoundation\Response;

$dispatcher = new EventDispatcher();
$resolver = new ControllerResolver();
$kernel = new HttpKernel( $dispatcher, $resolver );

$client = new Client( $kernel );
var_dump( $client );

?>

You also have a detailed example of a HTTP client for Symfony2 as part of the unit testing documentation. See: http://symfony.com/doc/current/book/testing.html

BUT (edit) these clients are local to your app. The concepts illustrated here are better implemented with the BrowserKit component of Symfony2. A headless browser within Symfony.

Better even, use Goutte for requests to external websites. See https://github.com/FriendsOfPHP/Goutte for details.

回答6:

https://github.com/CircleOfNice/CiRestClientBundle

Nice API for easy usage of the curl library and it returns a symfony response instead of a string result

$restClient = $this->container->get('ci.restclient');

$restClient->get('http://www.someUrl.com');
$restClient->post('http://www.someUrl.com', 'somePayload');
$restClient->put('http://www.someUrl.com', 'somePayload');
$restClient->delete('http://www.someUrl.com');
$restClient->patch('http://www.someUrl.com', 'somePayload');

$restClient->head('http://www.someUrl.com');
$restClient->options('http://www.someUrl.com', 'somePayload');
$restClient->trace('http://www.someUrl.com');
$restClient->connect('http://www.someUrl.com');