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Fix the CORSMethodMiddleware bug with subrouters

Fix the CORSMethodMiddleware bug with subrouters: a task in repo2rlenv-commit-runtime-test: repo2rlenv-commit-runtime (Harbor dataset). Title: Fix the CORSMethodMiddleware bug with subrouters

The task

**Title:** Fix the CORSMethodMiddleware bug with subrouters

Part of AdithyaSK/repo2rlenv-commit-runtime-test.