fix #2310

mitmproxy/net/http/message.py

@@ -226,8 +226,9 @@ class Message(serializable.Serializable):
         Raises:
             ValueError, when the content-encoding is invalid and strict is True.
         """
-        self.raw_content = self.get_content(strict)
+        decoded = self.get_content(strict)
         self.headers.pop("content-encoding", None)
+        self.content = decoded
 
     def encode(self, e):
         """

test/mitmproxy/addons/test_export.py

@@ -45,11 +45,11 @@ def tcp_flow():
 
 class TestExportCurlCommand:
     def test_get(self, get_request):
-        result = """curl -H 'header:qvalue' -H 'content-length:7' 'http://address:22/path?a=foo&a=bar&b=baz'"""
+        result = """curl -H 'header:qvalue' -H 'content-length:0' 'http://address:22/path?a=foo&a=bar&b=baz'"""
         assert export.curl_command(get_request) == result
 
     def test_post(self, post_request):
-        result = "curl -X POST 'http://address:22/path' --data-binary '{}'".format(
+        result = "curl -H 'content-length:256' -X POST 'http://address:22/path' --data-binary '{}'".format(
             str(bytes(range(256)))[2:-1]
         )
         assert export.curl_command(post_request) == result

test/mitmproxy/net/http/test_message.py

@@ -117,6 +117,14 @@ class TestMessageContentEncoding:
         assert r.content == b"message"
         assert r.raw_content != b"message"
 
+    def test_update_content_length_header(self):
+        r = tutils.tresp()
+        assert int(r.headers["content-length"]) == 7
+        r.encode("gzip")
+        assert int(r.headers["content-length"]) == 27
+        r.decode()
+        assert int(r.headers["content-length"]) == 7
+
     def test_modify(self):
         r = tutils.tresp()
         assert "content-encoding" not in r.headers