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I encountered a tricky problem when developing a project that needs to handle a large number of HTTP requests and responses: PHP's native HTTP handling is too cumbersome and inconsistent, making the code difficult to maintain and scale. For example, obtaining request information requires extraction from hyperglobal variables such as $_GET , $_POST , $_SERVER etc., and output response requires using header() function and echo statement. This approach is not only prone to errors, but also makes the code messy and difficult to manage.

To solve this problem, I decided to try using the sabre/http library. This library provides a powerful tool set that makes handling HTTP requests and responses simple and efficient.

First, I installed the sabre/http library through Composer:

 <code>composer require sabre/http:~5.0.0</code>

After the installation is complete, I started using Request and Response objects of the sabre/http library to handle HTTP requests and responses.

Get the request object

At the entrance to the app, I use the following code to get the request object:

 <code class="php">use Sabre\HTTP; include 'vendor/autoload.php'; $request = HTTP\Sapi::getRequest();</code>

This request object can be easily passed through dependency injection throughout the application and can be typed through its interface:

 <code class="php">function handleRequest(HTTP\RequestInterface $request) { // 處理請求}</code>

Create a response object

Creating and sending responses is just as simple as:

 <code class="php">use Sabre\HTTP; $response = new HTTP\Response(); $response->setStatus(201); // Created $response->setHeader('X-Foo', 'bar'); $response->setBody('success!'); HTTP\Sapi::sendResponse($response);</code>

Extend functionality using decorator mode

If you need to add additional functionality to the request or response object, the sabre/http library provides a decorator pattern. For example, I could create a custom request decorator to add isLoggedIn method:

 <code class="php">use Sabre\HTTP; class MyRequest extends HTTP\RequestDecorator { function isLoggedIn() { return true; } } $request = new MyRequest($request);</code>

Client Functions

The sabre/http library also includes a simple cURL wrapper for creating clients. This allows me to make API calls using familiar Request and Response objects:

 <code class="php">use Sabre\HTTP; $request = new HTTP\Request('GET', 'http://example.org/'); $request->setHeader('X-Foo', 'Bar'); $client = new HTTP\Client(); $response = $client->send($request); echo $response->getBodyAsString();</code>

In addition, the client also supports asynchronous requests, which is very useful for scenarios where multiple requests need to be executed in parallel:

 <code class="php">use Sabre\HTTP; $request = new HTTP\Request('GET', 'http://localhost/'); $client = new HTTP\Client(); for ($i = 0; $i sendAsync( $request, function(HTTP\ResponseInterface $response) { // 成功處理程序}, function($error) { // 錯誤處理程序} ); } $client->wait();</code>

Writing a reverse proxy

With the sabre/http library, I can also easily write a simple HTTP reverse proxy:

 <code class="php">use Sabre\HTTP\Sapi; use Sabre\HTTP\Client; $remoteUrl = 'http://example.org/'; $myBaseUrl = '/reverseproxy.php'; $request = Sapi::getRequest(); $request->setBaseUrl($myBaseUrl); $subRequest = clone $request; $subRequest->removeHeader('Host'); $subRequest->setUrl($remoteUrl . $request->getPath()); $client = new Client(); $response = $client->send($subRequest); Sapi::sendResponse($response);</code>

Using the sabre/http library, I successfully solved the complexity of HTTP request and response processing in PHP. Its Request and Response objects simplify the code structure, while the decorator pattern and client functions provide powerful expansion capabilities. In general, the sabre/http library greatly improves the efficiency of my project development and maintainability of code, and is ideal for handling HTTP requests and responses.

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