diff --git a/mitmproxy/proxy/protocol/http.py b/mitmproxy/proxy/protocol/http.py
index 9fe83ff61..3bc33ab0e 100644
--- a/mitmproxy/proxy/protocol/http.py
+++ b/mitmproxy/proxy/protocol/http.py
@@ -138,7 +138,7 @@ class HttpLayer(base.Layer):
     def __init__(self, ctx, mode):
         super().__init__(ctx)
         if mode not in MODES:
-            raise exceptions.ServerException("Invalid mode: %s"%mode)
+            raise exceptions.ServerException("Invalid mode: %s" % mode)
         self.mode = mode
         self.__initial_server_conn = None
         "Contains the original destination in transparent mode, which needs to be restored"
diff --git a/mitmproxy/proxy/root_context.py b/mitmproxy/proxy/root_context.py
index eacf7e0b8..4362347bc 100644
--- a/mitmproxy/proxy/root_context.py
+++ b/mitmproxy/proxy/root_context.py
@@ -90,16 +90,7 @@ class RootContext:
             if alpn == b'http/1.1':
                 return protocol.Http1Layer(top_layer, 'transparent')
 
-        # 6. Check for raw tcp mode
-        is_ascii = (
-            len(d) == 3 and
-            # expect A-Za-z
-            all(65 <= x <= 90 or 97 <= x <= 122 for x in d)
-        )
-        if self.config.options.rawtcp and not is_ascii:
-            return protocol.RawTCPLayer(top_layer)
-
-        # 7. Assume HTTP1 by default
+        # 6. Assume HTTP1 by default
         return protocol.Http1Layer(top_layer, 'transparent')
 
     def log(self, msg, level, subs=()):