PSR-18

Abstracting HTTP Clients in PHP

PHP Benelux, Antwerp - January 26th, 2019

© David Buchmann

What is the difference between

guzzle/guzzle

and

guzzlehttp/guzzle?

Depending on an implementation

Once upon a time

FOSHttpCache needs to send HTTP requests to varnish for cache invalidation

HTTPlug

=> Márk Sági-Kazár

• HTTP client interfaces
• FOSHttpCache 2.0 depends on HTTPlug instead of Guzzle 6

PHP Framework Interoperability Group (PHP-FIG)

• Initiative from framework and library projects
• Defines PHP Standard Recommendations (PSR)

HTTP Request and Response: PSR-7

• Interface for request
• Extended interface for server side request
• Interface for response
• For server side applications, this is all you need
• When building a client, you need more!

How to create an object without knowing the class?

interface RequestFactoryInterface
{
    function createRequest(string $method, $uri)
               : RequestInterface;
}

HTTP Message Factories: PSR-17

=> Woody Gilk

• Request factory
• Stream factory
• URI factory
• (Server Request factory, Uploaded File factory, Response factory)

How to send that request?

interface ClientInterface
{
  function sendRequest(RequestInterface $request)
           : ResponseInterface;
}

What is PSR-18?

HTTP Clien