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Rack documentation says that
File servers support X-Cascade header
rack-mount says that
Rack::Mount supports Rack’s +X-Cascade+ convention
What is X-Cascade ? I could not find any documentation on X-Cascade.
The server will set the X-Cascade header to “pass” to continue to try other routes. This allows for multiple routes to be nested/stacked.
The general purpose of this is to pass the request on to other middlewares to handle the request if that specific handler doesn’t handle it.