Content Negotiation PHP Library

<?php
if (! ($loader = @include __DIR__ . '/../vendor/autoload.php')) {
    die(<<<EOT
You need to install the project dependencies using Composer:
$ wget http://getcomposer.org/composer.phar
OR
$ curl -s https://getcomposer.org/installer | php
$ php composer.phar install --dev
$ phpunit
EOT
    );
}
$loader->add('Negotiation\Tests', __DIR__);

Content negotiation technology usually has three implementation schemes:

(1) Client driver

The client initiates a request, the server sends a list of options, and after the client makes a selection, it sends the Second request.

Advantages: relatively easy to implement

Disadvantages: increased delay, at least two requests must be sent, the first request to obtain the resource list, and the second request to obtain the selected copy.

(2) Server driver

The server checks the client's request header set and decides which version of the page to provide.

Advantages: Faster than client-driven negotiation. HTTP provides a q mechanism that allows the server to approximate matching, and also provides a vary header for the server to tell downstream devices (such as proxy servers) how to evaluate the request.

Disadvantages: The header set does not match, the server has to make guesses

(3) Transparent negotiation

An intermediate device (usually a cache proxy) negotiates on behalf of the client

Advantages: Eliminates the negotiation overhead of the web server and is faster than client-driven negotiation.

Disadvantages: HTTP does not provide corresponding specifications

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