Fix reverting of a flow

mitmproxy/addons/core.py

@@ -178,6 +178,7 @@ class Core:
         for f in flows:
             p = getattr(f, part, None)
             if p:
+                f.backup()
                 current_enc = p.headers.get("content-encoding", "identity")
                 if current_enc == "identity":
                     p.encode("deflate")

mitmproxy/tools/console/consoleaddons.py

@@ -383,6 +383,7 @@ class ConsoleAddon:
             part in ("response-headers", "response-body", "set-cookies") and
             flow.response is None
         )
+        flow.backup()
         if require_dummy_response:
             flow.response = http.HTTPResponse.make()
         if part == "cookies":