We used the Seastar HTTP server's add() method to register URLs to
serve (so-called "routes"), but as suggested by Amnon, when we have
fixed URLs without parameters being path components, it's simpler
to use the put() method to do the same thing - and also results in
slightly less work at run-time to look up these routes.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
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