README

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Introduction

A PSR-15 compatible chain request handler for PHP. This package allows you to combine multiple request handlers in a chain, processing HTTP requests sequentially until a handler returns a non-404 response. If all handlers return 404, a final 404 response is returned.

Features

• Chain multiple PSR-15 request handlers
• Automatically skips handlers that return 404
• Simple API for adding handlers dynamically
• Fully PSR-15 compatible
• Well-tested and easy to integrate

Installation

Requirements:

• PHP >= 8.1
• psr/http-message ^1.1|^2.0
• psr/http-server-handler ^1.0
• nyholm/psr7 ^1.8.2

Install via Composer:

composer require tourze/psr15-chain-request-handler

Quick Start

use Nyholm\Psr7\ServerRequest;
use Nyholm\Psr7\Response;
use Tourze\PSR15ChainRequestHandler\ChainRequestHandler;
use Psr\Http\Server\RequestHandlerInterface;

// Example handler that always returns 404
class NotFoundHandler implements RequestHandlerInterface {
    public function handle($request): Response {
        return new Response(404, body: 'Not Found');
    }
}

// Example handler that returns 200 for a specific path
class HelloHandler implements RequestHandlerInterface {
    public function handle($request): Response {
        if ($request->getUri()->getPath() === '/hello') {
            return new Response(200, body: 'Hello World');
        }
        return new Response(404, body: 'Not Found');
    }
}

$chain = new ChainRequestHandler([
    new NotFoundHandler(),
    new HelloHandler(),
]);

$request = new ServerRequest('GET', '/hello');
$response = $chain->handle($request);
// $response->getStatusCode() === 200

Documentation

• API Reference
• See tests/ChainRequestHandlerTest.php for usage scenarios

Advanced Usage

• Add handlers dynamically with $chain->addHandler($handler);
• Handlers are processed in the order they are added
• If no handler returns a non-404 response, the chain returns a 404 with body 'Not Found'

Contributing

• Please submit issues or pull requests via GitHub
• Follow PSR coding standards
• Run tests with PHPUnit before submitting PRs

License

MIT License. See LICENSE for details.

Changelog

See the CHANGELOG for release history and upgrade notes.