在 4.6 版本中，对 Swoole\Http\Response 进行了一些增强：
- 添加
Http\Response::isWritable(db56827) (@matyhtf) - 增强
Response\create()方法，可以独立于 Server 使用 (#3998) (@matyhtf)
再来看一下上一篇文章的示例代码：
use Swoole\Server; use Swoole\Http\Request; $server = new Server('127.0.0.1', 9501); $server->on('Receive', function (Server $server, $fd, $reactor_id, $data) { /** @var Request $request */ $request = Request::create(); $request->parse($data); $body = 'Hello, Swoole'; $body_len = strlen($body); $send_data = "HTTP/1.1 200 OK\r\nServer: swoole-server\r\nContent-Type: text/html;charset=utf-8\r\nContent-Length: {$body_len}\r\nConnection: keep-alive\r\n\r\n{$body}"; $server->send($fd, $send_data); }); $server->start();
需要用户自行处理$send_data的数据，而此次增强以后，可以这样使用：
use Swoole\Server; use Swoole\Http\Request; use Swoole\Http\Response; $server = new Server('127.0.0.1', 9501); $server->on('Receive', function (Server $server, $fd, $reactor_id, $data) { /** @var Request $request */ $request = Request::create(); $request->parse($data); /** @var Response $response */ $response = Response::create($server, $fd); $response->status(200); $response->end('Hello, Swoole'); }); $server->start();
还可以这样：
$server->on('Receive', function (Server $server, $fd, $reactor_id, $data) { /** @var Request $request */ $request = Request::create(); $request->parse($data); /** @var Response $response */ $response = Response::create([$server, $request], $fd); $response->status(200); $response->end('Hello, Swoole'); });
不但异步 Server 中可以使用，而且协程 Server 中也可以使用：
use Swoole\Coroutine\Server; use Swoole\Coroutine\Server\Connection; use Swoole\Http\Request; use Swoole\Http\Response; use function Swoole\Coroutine\run; run(function () { $server = new Server('0.0.0.0', 9501, false); $server->handle(function (Connection $conn) use ($server) { $request = Request::create(); while(true) { $data = $conn->recv(); if (strlen($data) != $request->parse($data) || $request->isCompleted()) { break; } } $response = Response::create([$conn->exportSocket(), $request]); $response->end('Hello, Swoole'); }); $server->start(); });
这样就可以直接使用 Http\Response 的 API 进行响应处理，而不用自行组装 HTTP 协议响应数据。
isWritable
isWritable() 用来判断 Http\Response 对象是否已结束 (end) 或已分离 (detach)，例如：
use Swoole\Http\Server; use Swoole\Http\Request; use Swoole\Http\Response; $http = new Server('0.0.0.0', 9501); $http->on('request', function (Request $req, Response $resp) { assert($resp->isWritable(), true); $resp->end('hello'); assert($resp->isWritable(), false); $resp->setStatusCode(403); }); $http->start();
如果在调用end()之后，再次调用相关 API，就会发生错误
PHP Warning: Swoole\Http\Response::setStatusCode(): http response is unavailable (maybe it has been ended or detached)
