Update oxy dependency

server/errorhandler.go

@@ -1,6 +1,7 @@
 package server
 
 import (
+	"context"
 	"io"
 	"net"
 	"net/http"
@@ -9,6 +10,12 @@ import (
 	"github.com/containous/traefik/middlewares"
 )
 
+// StatusClientClosedRequest non-standard HTTP status code for client disconnection
+const StatusClientClosedRequest = 499
+
+// StatusClientClosedRequestText non-standard HTTP status for client disconnection
+const StatusClientClosedRequestText = "Client Closed Request"
+
 // RecordingErrorHandler is an error handler, implementing the vulcand/oxy
 // error handler interface, which is recording network errors by using the netErrorRecorder.
 // In addition it sets a proper HTTP status code and body, depending on the type of error occurred.
@@ -34,9 +41,18 @@ func (eh *RecordingErrorHandler) ServeHTTP(w http.ResponseWriter, req *http.Requ
 	} else if err == io.EOF {
 		eh.netErrorRecorder.Record(req.Context())
 		statusCode = http.StatusBadGateway
+	} else if err == context.Canceled {
+		statusCode = StatusClientClosedRequest
 	}
 
 	w.WriteHeader(statusCode)
-	w.Write([]byte(http.StatusText(statusCode)))
-	log.Debugf("'%d %s' caused by: %v", statusCode, http.StatusText(statusCode), err)
+	w.Write([]byte(statusText(statusCode)))
+	log.Debugf("'%d %s' caused by: %v", statusCode, statusText(statusCode), err)
+}
+
+func statusText(statusCode int) string {
+	if statusCode == StatusClientClosedRequest {
+		return StatusClientClosedRequestText
+	}
+	return http.StatusText(statusCode)
 }