check / check (push) Waiting to run
ReverseProxy refuses a 101 whose Upgrade is not the one the client asked for, but modifyResponse had already counted the 101 as sent, so answerError sent nothing and the client got an empty 200. The 101 now counts as sent only once ReverseProxy has taken over the client's connection, and answerError closes the app's switched connection, which ReverseProxy leaves open when it refuses the switch. Model: opus-5-5