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Middleware factory which produces a middleware that normalizes
the path of a request. By normalizing it means:
- Add or remove a trailing slash to the path.
- Double slashes are replaced by one.
The middleware returns as soon as it finds a path that resolves
correctly. The order if both merge and append/remove are enabled is
1) merge slashes
2) append/remove slash
3) both merge slashes and append/remove slash.
If the path resolves with at least one of those conditions, it will
redirect to the new path.
Only one of `append_slash` and `remove_slash` can be enabled. If both
are `True` the factory will raise an assertion error
If `append_slash` is `True` the middleware will append a slash when
needed. If a resource is defined with trailing slash and the request
comes without it, it will append it automatically.
If `remove_slash` is `True`, `append_slash` must be `False`. When enabled
the middleware will remove trailing slashes and redirect if the resource
is defined
If merge_slashes is True, merge multiple consecutive slashes in the
path into one.
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