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Previously, for regular handlers the request body was read in routing() before the route was matched, so the pre-request handler always saw an already-read body. The ContentReader path, in contrast, ran the pre-request handler before the body was read. This inconsistency made it impossible to reject a request (e.g. failed per-route authentication via req.matched_route) without buffering a potentially large body. Move the read_content() call into dispatch_request(), after route matching and the pre-request handler, so both paths behave the same: route matching -> pre_request_handler -> body read -> handler. A request rejected by the pre-request handler no longer reads the body at all; the existing keep-alive drain logic still consumes any framed body afterwards. Note: code that referenced req.body or body-derived form fields inside the pre-request handler will now see an empty body. Inspect headers, path, query parameters, or matched_route instead. Also document the handler execution order in README and update the pre-request cookbook pages (en/ja).