From e50428c732d940742f97e22daca330357fa5d1c8 Mon Sep 17 00:00:00 2001
From: Saksham Goyal <sakshamgoyal1510@gmail.com>
Date: Mon, 14 Sep 2026 20:47:08 +0530
Subject: [PATCH] Stop parsing completed HTTP proxy responses.

---
 src/websockets/asyncio/client.py |  7 ++--
 tests/asyncio/test_client.py     | 60 ++++++++++++++++++++++++++++++++
 2 files changed, 65 insertions(+), 2 deletions(-)

diff --git a/src/websockets/asyncio/client.py b/src/websockets/asyncio/client.py
index 4e983bbee..c50d773c9 100644
--- a/src/websockets/asyncio/client.py
+++ b/src/websockets/asyncio/client.py
@@ -757,16 +757,19 @@ def connection_made(self, transport: asyncio.BaseTransport) -> None:
         )
 
     def data_received(self, data: bytes) -> None:
+        if self.response.done():
+            return
         self.reader.feed_data(data)
         self.run_parser()
 
     def eof_received(self) -> None:
+        if self.response.done():
+            return
         self.reader.feed_eof()
         self.run_parser()
 
     def connection_lost(self, exc: Exception | None) -> None:
-        self.reader.feed_eof()
-        self.run_parser()
+        self.eof_received()
 
 
 async def connect_http_proxy(
diff --git a/tests/asyncio/test_client.py b/tests/asyncio/test_client.py
index 46bbb59b1..20febc8e9 100644
--- a/tests/asyncio/test_client.py
+++ b/tests/asyncio/test_client.py
@@ -11,6 +11,7 @@
 from unittest.mock import patch
 
 from websockets.asyncio.client import *
+from websockets.asyncio.client import HTTPProxyConnection
 from websockets.asyncio.server import serve, unix_serve
 from websockets.client import backoff
 from websockets.exceptions import (
@@ -18,12 +19,15 @@
     InvalidMessage,
     InvalidProxy,
     InvalidProxyMessage,
+    InvalidProxyStatus,
     InvalidStatus,
     InvalidURI,
     ProxyError,
     SecurityError,
 )
 from websockets.extensions.permessage_deflate import PerMessageDeflate
+from websockets.proxy import parse_proxy
+from websockets.uri import parse_uri
 
 from ..proxy import ProxyMixin
 from ..utils import CLIENT_CONTEXT, MS, SERVER_CONTEXT, temp_unix_socket_path
@@ -52,6 +56,62 @@ async def few_redirects():
         client.MAX_REDIRECTS = max_redirects
 
 
+class HTTPProxyLifecycleTests(unittest.IsolatedAsyncioTestCase):
+    def make_protocol(self):
+        return HTTPProxyConnection(
+            parse_uri("ws://localhost/"), parse_proxy("http://localhost:8080")
+        )
+
+    async def test_success_then_connection_lost(self):
+        protocol = self.make_protocol()
+        protocol.data_received(b"HTTP/1.1 200 OK\r\n\r\n")
+        response = await protocol.response
+        protocol.connection_lost(None)
+        self.assertIs(await protocol.response, response)
+
+    async def test_rejection_then_connection_lost(self):
+        protocol = self.make_protocol()
+        protocol.data_received(b"HTTP/1.1 407 Authentication Required\r\n\r\n")
+        with self.assertRaises(InvalidProxyStatus):
+            await protocol.response
+        protocol.connection_lost(None)
+
+    async def test_invalid_response_then_connection_lost(self):
+        protocol = self.make_protocol()
+        protocol.data_received(b"invalid\r\n\r\n")
+        with self.assertRaises(InvalidProxyMessage):
+            await protocol.response
+        protocol.connection_lost(None)
+
+    async def test_eof_then_connection_lost(self):
+        protocol = self.make_protocol()
+        protocol.eof_received()
+        with self.assertRaises(InvalidProxyMessage):
+            await protocol.response
+        protocol.connection_lost(None)
+
+    async def test_cancelled_response_then_connection_lost(self):
+        protocol = self.make_protocol()
+        protocol.response.cancel()
+        protocol.connection_lost(None)
+        self.assertTrue(protocol.response.cancelled())
+
+    async def test_incomplete_response_then_connection_lost(self):
+        protocol = self.make_protocol()
+        protocol.data_received(b"HTTP/1.1 200")
+        self.assertFalse(protocol.response.done())
+        protocol.connection_lost(None)
+        with self.assertRaises(InvalidProxyMessage):
+            await protocol.response
+
+    async def test_data_after_response(self):
+        protocol = self.make_protocol()
+        protocol.data_received(b"HTTP/1.1 200 OK\r\n\r\n")
+        response = await protocol.response
+        protocol.data_received(b"extra bytes")
+        self.assertIs(await protocol.response, response)
+
+
 class ClientTests(unittest.IsolatedAsyncioTestCase):
     async def test_context_manager(self):
         """Client connects to server and disconnects automatically."""