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Some people access the electrs server using the unknown method, which is obsolete in electrum. It's unclear if this is due to a very old wallet or a homebrew application.
Currently, the unknown method is treated as an error and the peer is disconnected. But these peers reconnect every 10 seconds or every minute.
There seems to be something wrong with the error handling. However, I think there is also an idea that access by unknown method is not processed as an error.
This proposal simply returns a message for access using the unknown method. This drastically reduced the occurrence of "ERROR".