Koa - HelloWorld
以上便是全部了,我们重点来看示例,我们只注册一个中间件, Hello Worler Server:
<?php
$app = new Application();
// ...
$app->υse(function(Context $ctx) {
$ctx->status = 200;
$ctx->body = "<h1>Hello World</h1>";
});
$app->listen(3000);
我们在Hello中间件前面注册一个Reponse-Time中间件,注意看,我们的逻辑是连贯的:
<?php
$app->υse(function(Context $ctx, $next) {
$start = microtime(true);
yield $next; // 执行后续中间件
$ms = number_format(microtime(true) - $start, 7);
// response header 写入 X-Response-Time: xxxms
$ctx->{"X-Response-Time"} = "{$ms}ms";
});