TestFetchTooLargeIsStreaming asserted the server wrote at most 64 KiB, but the handler keeps flushing 64-byte chunks until the client's close propagates, which under a loaded full-suite run exceeds that (observed ~80 KiB). The assertion guards against unbounded buffering toward 8 MiB, so 1 MiB keeps the intent and removes the flake.
11 KiB
11 KiB