Nginx/Passenger配置：按请求参数控制缓存与Passenger处理逻辑

I’ve tackled this exact performance optimization before, and here’s a targeted approach to cut down on unnecessary work for Passenger and your backend Rails app. The goal is to route requests smartly based on whether a version parameter is present, while leveraging cached files whenever possible:

Core Logic Breakdown #

• When the URL includes the version parameter: Pass the request straight to Passenger. This lets your Rails app handle any version-specific logic that can’t be served from a static cache.
• When the URL doesn’t have the version parameter:
  • First, check if a pre-generated cached file exists for the requested URI. If it does, serve that static file directly—this skips Passenger entirely for a much faster response.
  • If no cached file exists, fall back to sending the request to Passenger so Rails can generate the file (and ideally cache it for future requests).

Example Nginx Configuration #

Here’s how to implement this in your Nginx config:

location ~ ^/scripts/.*\.meta\.js$ {
    # Route requests with 'version' param directly to Passenger
    if ($args ~* "version=") {
        passenger_enabled on;
        break;
    }

    # Serve cached file if available; else pass to Passenger
    try_files $uri @passenger_backend;
}

# Named location for Passenger handling
location @passenger_backend {
    passenger_enabled on;
}

Why This Works #

• The if block efficiently catches requests needing Rails-specific processing (those with version).
• try_files prioritizes static cached files first, which reduces Passenger and Rails overhead for repeat requests where no versioning is needed. Only when the cache is missing do we involve the backend.

内容的提问来源于stack exchange，提问作者jb_314