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This method receives the name of a static file that is going to be served up and generates a dict of options to use when serving the file. The default set is empty so code will fall back to the existing behavior if the method is not overridden. I needed this method to adjust the cache control headers for .js files that one of my applications was statically serving. The default expiration is buried in an argument to send_file and is set to 12 hours. There was no good way to adjust this value previously.
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