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public function handle($request, Closure $next)
{
    // ¼ì²é´ËÇëÇóÊÇ·ñ¿ÉÒÔ»º´æ
    if (! $this->shouldCache($request)) {
        return $next($request);
    }

    // »ñÈ¡´ËÇëÇóµÄ»º´æ¼ü
    $key = $this->getCacheKey($request);

    // ÊµÑé´Ó»º´æÖлñÈ¡´ËÇëÇóµÄÒ³Ãæ
    if (Cache::has($key)) {
        return response(Cache::get($key));
    }

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    $response = $next($request);
    if ($this->shouldCacheResponse($response)) {
        Cache::put($key, $response->getContent(), $this->getCacheLifetime());
    }

    return $response;
}

// ¼ì²é´ËÇëÇóÊÇ·ñ¿ÉÒÔ»º´æ
protected function shouldCache($request)
{
    if (!$request->isMethod('get')) {
        return false;
    }

    if ($request->query->count()) {
        return false;
    }

    if (auth()->check()) {
        return false;
    }

    if (config('app.env') === 'local') {
        return false;
    }

    return true;
}

// »ñÈ¡´ËÇëÇóµÄ»º´æ¼ü
protected function getCacheKey($request)
{
    return 'cache:' . $request->url();
}

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protected function shouldCacheResponse($response)
{
    return $response->status() === 200;
}

// »ñÈ¡Ò³Ã滺´æµÄÉúÑÄʱ¼ä
protected function getCacheLifetime()
{
    return config('cache.page_cache_lifetime');
}

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