This middleware returns a file’s contents from disk in the body response. When initialized, it can accept optional HTTP headers, which will be set when a response containing a file’s contents is delivered.

This middleware will render the file specified in `env[“PATH_INFO”]` where the base path is in the root directory. For example, if the root is set to `public/`, then a request with `env[“PATH_INFO”]` of `assets/application.js` will return a response with the contents of a file located at `public/assets/application.js` if the file exists. If the file does not exist, a 404 “File not Found” response will be returned.

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