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Package pathutil
Package pathutil implements utility functions for handling slash-separated
paths.
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func CanonicalURLPath(p string) string
CanonicalURLPath returns the canonical url path for p, which follows the rules:
1. the path always starts with "/"
2. replace multiple slashes with a single slash
3. replace each '.' '..' path name element with equivalent one
4. keep the trailing slash
The function is borrowed from stdlib http.cleanPath in server.go.