Guzzlehttp - 如何从Guzzle 6获得回复？

Question

I'm trying to write a wrapper around an api my company is developing. It's restful, and using Postman I can send a post request to an endpoint like http://subdomain.dev.myapi.com/api/v1/auth/ with a username and password as POST data and I am given back a token. All works as expected. Now, when I try and do the same from PHP I get back a GuzzleHttp\Psr7\Response object, but can't seem to find the token anywhere inside it as I did with the Postman request.

The relevant code looks like:

$client = new Client(['base_uri' => 'http://companysub.dev.myapi.com/']);
$response = $client->post('api/v1/auth/', [
    'form_params' => [
        'username' => $user,
        'password' => $password
    ]
]);

var_dump($response); //or $resonse->getBody(), etc...

The output of the code above looks something like (warning, incoming wall of text):

object(guzzlehttp\psr7esponse)#36 (6) {
  ["reasonphrase":"guzzlehttp\psr7esponse":private]=>
  string(2) "ok"
  ["statuscode":"guzzlehttp\psr7esponse":private]=>
  int(200)
  ["headers":"guzzlehttp\psr7esponse":private]=>
  array(9) {
    ["connection"]=>
    array(1) {
      [0]=>
      string(10) "keep-alive"
    }
    ["server"]=>
    array(1) {
      [0]=>
      string(15) "gunicorn/19.3.0"
    }
    ["date"]=>
    array(1) {
      [0]=>
      string(29) "sat, 30 may 2015 17:22:41 gmt"
    }
    ["transfer-encoding"]=>
    array(1) {
      [0]=>
      string(7) "chunked"
    }
    ["content-type"]=>
    array(1) {
      [0]=>
      string(16) "application/json"
    }
    ["allow"]=>
    array(1) {
      [0]=>
      string(13) "post, options"
    }
    ["x-frame-options"]=>
    array(1) {
      [0]=>
      string(10) "sameorigin"
    }
    ["vary"]=>
    array(1) {
      [0]=>
      string(12) "cookie, host"
    }
    ["via"]=>
    array(1) {
      [0]=>
      string(9) "1.1 vegur"
    }
  }
  ["headerlines":"guzzlehttp\psr7esponse":private]=>
  array(9) {
    ["connection"]=>
    array(1) {
      [0]=>
      string(10) "keep-alive"
    }
    ["server"]=>
    array(1) {
      [0]=>
      string(15) "gunicorn/19.3.0"
    }
    ["date"]=>
    array(1) {
      [0]=>
      string(29) "sat, 30 may 2015 17:22:41 gmt"
    }
    ["transfer-encoding"]=>
    array(1) {
      [0]=>
      string(7) "chunked"
    }
    ["content-type"]=>
    array(1) {
      [0]=>
      string(16) "application/json"
    }
    ["allow"]=>
    array(1) {
      [0]=>
      string(13) "post, options"
    }
    ["x-frame-options"]=>
    array(1) {
      [0]=>
      string(10) "sameorigin"
    }
    ["vary"]=>
    array(1) {
      [0]=>
      string(12) "cookie, host"
    }
    ["via"]=>
    array(1) {
      [0]=>
      string(9) "1.1 vegur"
    }
  }
  ["protocol":"guzzlehttp\psr7esponse":private]=>
  string(3) "1.1"
  ["stream":"guzzlehttp\psr7esponse":private]=>
  object(guzzlehttp\psr7\stream)#27 (7) {
    ["stream":"guzzlehttp\psr7\stream":private]=>
    resource(40) of type (stream)
    ["size":"guzzlehttp\psr7\stream":private]=>
    null
    ["seekable":"guzzlehttp\psr7\stream":private]=>
    bool(true)
    ["readable":"guzzlehttp\psr7\stream":private]=>
    bool(true)
    ["writable":"guzzlehttp\psr7\stream":private]=>
    bool(true)
    ["uri":"guzzlehttp\psr7\stream":private]=>
    string(10) "php://temp"
    ["custommetadata":"guzzlehttp\psr7\stream":private]=>
    array(0) {
    }
  }
}

The output from Postman was something like:

{
    "data" : {
        "token" "fasdfasf-asfasdfasdf-sfasfasf"
    }
}

Clearly I'm missing something about working with the response objects in Guzzle. The Guzzle response indicates a 200 status code on the request, so I'm not sure exactly what I need to do to retrieve the returned data.

Answer 1

Guzzle implements PSR-7. That means that it will by default store the body of a message in a Stream that uses PHP temp streams. To retrieve all the data, you can use casting operator:

$contents = (string) $response->getBody();

You can also do it with

$contents = $response->getBody()->getContents();

The difference between the two approaches is that getContents returns the remaining contents, so that a second call returns nothing unless you seek the position of the stream with rewind or seek .

$stream = $response->getBody();
$contents = $stream->getContents(); // returns all the contents
$contents = $stream->getContents(); // empty string
$stream->rewind(); // Seek to the beginning
$contents = $stream->getContents(); // returns all the contents

Instead, usings PHP's string casting operations, it will reads all the data from the stream from the beginning until the end is reached.

$contents = (string) $response->getBody(); // returns all the contents
$contents = (string) $response->getBody(); // returns all the contents

Documentation: http://docs.guzzlephp.org/en/latest/psr7.html#responses