197 laravel 源码分析-4

Illuminate\Foundation\Http\Kernel

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handle()

try {   $request->enableHttpMethodParameterOverride();   $response = $this->sendRequestThroughRouter($request);} catch (Exception $e) {   $this->reportException($e);   $response = $this->renderException($request, $e);} catch (Throwable $e) {   $e = new FatalThrowableError($e);   $this->reportException($e);   $response = $this->renderException($request, $e);}$this->app['events']->fire('kernel.handled', [$request, $response]);return $response;

核心是这一行$response = $this->sendRequestThroughRouter($request);，因此我们看下sendRequestThroughRouter()方法

sendRequestThroughRouter（）

protected function sendRequestThroughRouter($request){    $this->app->instance('request', $request);    Facade::clearResolvedInstance('request');    $this->bootstrap();    return (new Pipeline($this->app))                ->send($request)                ->through($this->app->shouldSkipMiddleware() ? [] : $this->middleware)                ->then($this->dispatchToRouter());}

关键是最后二行：
$this->bootstrap();
最后一行把Request送进一个新创建的流水线(Pipeline)， 供各个中间件(Middleware)处理，然后再派发给路由器(Router)