diff --git a/mitmproxy/console/flowview.py b/mitmproxy/console/flowview.py
index 3538c4ad9..2010cecd2 100644
--- a/mitmproxy/console/flowview.py
+++ b/mitmproxy/console/flowview.py
@@ -186,7 +186,7 @@ class FlowView(tabs.Tabs):
                 viewmode,
                 message,
                 limit,
-                (bytes(message.headers), message.content)  # Cache invalidation
+                message  # Cache invalidation
             )
 
     def _get_content_view(self, viewmode, message, max_lines, _):
diff --git a/netlib/http/message.py b/netlib/http/message.py
index 9b0180cf7..028f43a1a 100644
--- a/netlib/http/message.py
+++ b/netlib/http/message.py
@@ -26,6 +26,9 @@ class MessageData(utils.Serializable):
     def __ne__(self, other):
         return not self.__eq__(other)
 
+    def __hash__(self):
+        return hash(frozenset(self.__dict__.items()))
+
     def set_state(self, state):
         for k, v in state.items():
             if k == "headers":
@@ -52,6 +55,9 @@ class Message(utils.Serializable):
     def __ne__(self, other):
         return not self.__eq__(other)
 
+    def __hash__(self):
+        return hash(self.data) ^ 1
+
     def get_state(self):
         return self.data.get_state()
 
diff --git a/netlib/multidict.py b/netlib/multidict.py
index 3af7979b2..248acdec0 100644
--- a/netlib/multidict.py
+++ b/netlib/multidict.py
@@ -81,6 +81,9 @@ class _MultiDict(MutableMapping, Serializable):
     def __ne__(self, other):
         return not self.__eq__(other)
 
+    def __hash__(self):
+        return hash(self.fields)
+
     def get_all(self, key):
         """
         Return the list of all values for a given key.