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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