=======================
Guzzle Cache Subscriber
=======================
.. important::
**This repo has not been updated for Guzzle 6 and only supports Guzzle 5.**
See https://github.com/Kevinrob/guzzle-cache-middleware for a nice Guzzle 6
compatible Cache middleware.
Provides a private transparent proxy cache for caching HTTP responses.
Here's a simple example of how it's used:
.. code-block:: php
use GuzzleHttp\Client;
use GuzzleHttp\Subscriber\Cache\CacheSubscriber;
$client = new Client(['defaults' => ['debug' => true]]);
// Use the helper method to attach a cache to the client.
CacheSubscriber::attach($client);
// Send the first request
$a = $client->get('http://en.wikipedia.org/wiki/Main_Page');
// Send the second request. This will find a cache hit which must be
// validated. The validation request returns a 304, which yields the original
// cached response.
$b = $client->get('http://en.wikipedia.org/wiki/Main_Page');
Running the above code sample should output verbose cURL information that looks
something like this:
::
> GET /wiki/Main_Page HTTP/1.1
Host: en.wikipedia.org
User-Agent: Guzzle/4.2.1 curl/7.37.0 PHP/5.5.13
Via: 1.1 GuzzleCache/4.2.1
< HTTP/1.1 200 OK
< Server: Apache
< X-Content-Type-Options: nosniff
< Content-language: en
< X-UA-Compatible: IE=Edge
< Vary: Accept-Encoding,Cookie
< Last-Modified: Thu, 21 Aug 2014 01:51:49 GMT
< Content-Type: text/html; charset=UTF-8
< X-Varnish: 2345493325, 1998949714 1994269567
< Via: 1.1 varnish, 1.1 varnish
< Transfer-Encoding: chunked
< Date: Thu, 21 Aug 2014 02:34:12 GMT
< Age: 2541
< Connection: keep-alive
< X-Cache: cp1055 hit (1), cp1068 frontend hit (25353)
< Cache-Control: private, s-maxage=0, max-age=0, must-revalidate
< Set-Cookie: GeoIP=US:Seattle:47.6062:-122.3321:v4; Path=/; Domain=.wikipedia.org
<
* Connection #0 to host en.wikipedia.org left intact
* Re-using existing connection! (#0) with host en.wikipedia.org
> GET /wiki/Main_Page HTTP/1.1
Host: en.wikipedia.org
User-Agent: Guzzle/4.2.1 curl/7.37.0 PHP/5.5.13
Via: 1.1 GuzzleCache/4.2.1, 1.1 GuzzleCache/4.2.1
If-Modified-Since: Thu, 21 Aug 2014 01:51:49 GMT
< HTTP/1.1 304 Not Modified
< Server: Apache
< X-Content-Type-Options: nosniff
< Content-language: en
< X-UA-Compatible: IE=Edge
< Vary: Accept-Encoding,Cookie
< Last-Modified: Thu, 21 Aug 2014 01:51:49 GMT
< Content-Type: text/html; charset=UTF-8
< X-Varnish: 2345493325, 1998950450 1994269567
< Via: 1.1 varnish, 1.1 varnish
< Date: Thu, 21 Aug 2014 02:34:12 GMT
< Age: 2541
< Connection: keep-alive
< X-Cache: cp1055 hit (1), cp1068 frontend hit (25360)
< Cache-Control: private, s-maxage=0, max-age=0, must-revalidate
< Set-Cookie: GeoIP=US:Seattle:47.6062:-122.3321:v4; Path=/; Domain=.wikipedia.org
<
* Connection #0 to host en.wikipedia.org left intact
Installing
----------
Add the following to your composer.json:
.. code-block:: javascript
{
"require": {
"guzzlehttp/cache-subscriber": "0.2.*@dev"
}
}
or
.. code-block:: console
$ composer require guzzlehttp/cache-subscriber
Creating a CacheSubscriber
--------------------------
The easiest way to create a CacheSubscriber is using the ``attach()`` helper
method of ``GuzzleHttp\Subscriber\Cache\CacheSubscriber``. This method accepts
a request or client object and attaches the necessary subscribers used to
perform cache lookups, validation requests, and automatic purging of resources.
The ``attach()`` method accepts the following options:
storage
A ``GuzzleHttp\Subscriber\Cache\CacheStorageInterface`` object used to
store cached responses. If no value is not provided, an in-memory array
cache will be used.
validate
A Boolean value that determines if cached response are ever validated
against the origin server. This setting defaults to ``true`` but can be
disabled by passing ``false``.
purge
A Boolean value that determines if cached responses are purged when
non-idempotent requests are sent to their URI. This setting defaults to
``true`` but can be disabled by passing ``false``.
can_cache
An optional callable used to determine if a request can be cached. The
callable accepts a ``GuzzleHttp\Message\RequestInterface`` and returns a
Boolean value. If no value is provided, the default behavior is utilized.
.. warning::
This is a WIP update for Guzzle 5+. It hasn't been tested and is in
active development. Expect bugs and breaks.
