KITAHARA SETSUNA

getAbsoluteFSPath function is actually a [shorthand](https://github.com/swagger-api/swagger-ui/blob/cc408812fc927e265da158bf68239530740ab4cc/swagger-ui-dist-package/index.js) of require('absolute-path.js'), and the absolute-path.js have [test](https://github.com/swagger-api/swagger-ui/blob/cc408812fc927e265da158bf68239530740ab4cc/test/unit/swagger-ui-dist-package/absolute-path.js), so we can concern it as stable API.

@oerdnj macOS use `connectx` with flags `CONNECT_DATA_IDEMPOTENT` to indicate a socket use TFO. See http://www.manpagez.com/man/2/connectx/ and https://github.com/facebook/folly/blob/95ceac6552694ee1dc4f6f289a408aa9eeabc262/folly/detail/SocketFastOpen.cpp#L68