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Informations about the package content-negotiation-middleware

Content negotiation middleware

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Motivation

Packages like middlewares/negotiation do a very good job to detect the correct content type based on the Accept header (or extension in the URI), however they delegate to the RequestHandler to format the content according to the detected mime type.

That works fine for most cases but it usually creates a lot of duplication in complex software, where every single RequestHandler should do that formatting (or depend on some component to do that). That logic should also be added to the middleware that handles exceptions and converts them to the appropriated HTTP response.

The goal of this middleware is to provide full content negotiation (detection and formatting).

Installation

This package is available on Packagist, and we recommend you to install it using Composer:

Adventure mode

If you're ready for an adventure and don't want to use middlewares/negotiation to handle the detection or laminas/diactoros to create the response body (StreamInterface implementation), don't despair! You'll only have to use the normal ContentTypeMiddleware::__construct() instead of ContentTypeMiddleware::fromRecommendedSettings().

We do have a small preference for the mentioned packages and didn't want to reinvent the wheel... but you know, it's a free world.

PHP Configuration

In order to make sure that other components are returning the expected objects we decided to use assert(), which is a very interesting feature in PHP but not often used. The nice thing about assert() is that we can (and should) disable it in production mode so that we don't have useless statements.

So, for production mode, we recommend you to set zend.assertions to -1 in your php.ini. For development, you should leave zend.assertions as 1 and set assert.exception to 1, which will make PHP throw an AssertionError when things go wrong.

Check the documentation for more information: https://secure.php.net/manual/en/function.assert.php

Usage

Your very first step is to create the middleware using the correct configuration:

Then you must add the middleware to very beginning of your pipeline, which will depend on the library/framework you're using, but it will be something similar to this:

Finally, you just need to use UnformattedResponse as return of the request handlers you create to trigger to formatting when needed:

Formatters

We provide some basic formatters by default:

If you want to create a customised formatter the only thing needed is to implement the Formatter interface:

License

MIT, see LICENSE.

All versions of content-negotiation-middleware with dependencies

PHP Build Version
Package Version
Requires php Version ~8.1.0 || ~8.2.0 || ~8.3.0
ext-json Version *
fig/http-message-util Version ^1.1.5
psr/http-factory Version ^1.0.2
psr/http-message Version ^1.1 || ^2.0
psr/http-server-middleware Version ^1.0.2
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