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- Double slashes are replaced by one.
The middleware returns as soon as it finds a path that resolves
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and 3) both merge_slashes and append_slash. If the path resolves with
at least one of those conditions, it will redirect to the new path.
If append_slash is True append slash when needed. If a resource is
defined with trailing slash and the request comes without it, it will
append it automatically.
If merge_slashes is True, merge multiple consecutive slashes in the
path into one.
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