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By default, haproxy sens an OPTION request, which we didn't handle until now. In addition, all haproxy requests that doesn't examine the request body close the connection as soon as the status code is obtained. Such behavior breaks BaseHTTPRequestHandler, namely handle_one_request, which doesn't check for connection reset by peer and throw this error on a higher level, but since we don't call this function directly, there is no place in the code to catch it, therefore, we have to patch this function in the base class. In addition, patch the StreamRequestHandler finish() function in order to handle the connection reset error. Re-read the cluster from DCS right after the failover to supply the correct new values to the API thread. Fix a typo.