5.2 Mapping URLs to Paths
"dispatchers/filesystem-map.ss" provides a means of mapping URLs to paths on the filesystem.
This contract is equivalent to (->* (url?) (path? (listof path-element?))). The returned path? is the path on disk. The list is the list of path elements that correspond to the path of the URL.
(make-url->path base) → url-path? |
base : path? |
The url-path? returned by this procedure considers the root URL to be base. It ensures that ".."s in the URL do not escape the base and removes them silently otherwise.
(make-url->valid-path url->path) → url->path? |
url->path : url->path? |
Runs the underlying url->path, but only returns if the path refers to a file that actually exists. If it is does not, then the suffix elements of the URL are removed until a file is found. If this never occurs, then an error is thrown.
This is primarily useful for dispatchers that allow path information after the name of a service to be used for data, but where the service is represented by a file. The most prominent example is obviously servlets.