[HTTP] bugs #1377

FileProcessMiddleware 不自行檢查 ..，目前依賴 URI 解析的正規化，實測無法穿越，但防禦不足。
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adaptLegacyEvents() 中的 'reponse' 拼字錯誤。

Pitfall: ReactServer does not run the middleware chain. It dispatches its events directly, so the two built-in middleware have no effect there. Use a server built on HttpServerTrait when you need middleware with an event loop.