diff --git a/manager-solution/manager/manager.py b/manager-solution/manager/manager.py
index 89f6637..c32c729 100644
--- a/manager-solution/manager/manager.py
+++ b/manager-solution/manager/manager.py
@@ -13,6 +13,7 @@ import socket
 import threading
 import time
 from typing import Any, Dict, Iterable, Optional
+from urllib.parse import urlsplit
 
 import docker
 
@@ -274,7 +275,14 @@ def extract_user_from_http_request(data: bytes, known_users: Dict[str, Dict[str,
             if candidate in known_users and candidate not in {"localhost", "127", "0"}:
                 return known_users[candidate], data, None
 
-    path, separator, query = target.partition("?")
+    parsed_target = urlsplit(target)
+    if parsed_target.scheme and parsed_target.netloc:
+        path = parsed_target.path or "/"
+        query = parsed_target.query
+        separator = "?" if query else ""
+    else:
+        path, separator, query = target.partition("?")
+
     segments = [segment for segment in path.split("/") if segment]
     if segments:
         candidate = segments[0]
@@ -530,7 +538,7 @@ async def main():
         log(
             "Shared gateway ready: "
             f"{format_access_url('localhost', GATEWAY_PORT)} "
-            "(host-based routing: http://<user>.localhost:{GATEWAY_PORT})"
+            f"(host-based routing: http://<user>.localhost:{GATEWAY_PORT})"
         )
         servers.append(gateway_server)
 
diff --git a/manager-solution/manager/test_manager.py b/manager-solution/manager/test_manager.py
index fabcf67..ec36b7b 100644
--- a/manager-solution/manager/test_manager.py
+++ b/manager-solution/manager/test_manager.py
@@ -221,6 +221,52 @@ class ManagerConfigTests(unittest.TestCase):
         )
         self.assertIsNone(redirect_target)
 
+    def test_extract_user_from_bare_user_path_rewrites_to_root(self):
+        request = (
+            b"GET /user1 HTTP/1.1\r\n"
+            b"Host: 10.200.200.113:8080\r\n"
+            b"Connection: keep-alive\r\n"
+            b"\r\n"
+        )
+        users = {"user1": {"id": "user1"}}
+
+        user, rewritten, redirect_target = self.manager.extract_user_from_http_request(request, users)
+
+        self.assertEqual(user["id"], "user1")
+        self.assertEqual(
+            rewritten,
+            (
+                b"GET / HTTP/1.1\r\n"
+                b"Host: 10.200.200.113:8080\r\n"
+                b"Connection: keep-alive\r\n"
+                b"\r\n"
+            ),
+        )
+        self.assertIsNone(redirect_target)
+
+    def test_extract_user_from_absolute_form_request_rewrites_to_root(self):
+        request = (
+            b"GET http://10.200.200.113:8080/user1 HTTP/1.1\r\n"
+            b"Host: 10.200.200.113:8080\r\n"
+            b"Connection: keep-alive\r\n"
+            b"\r\n"
+        )
+        users = {"user1": {"id": "user1"}}
+
+        user, rewritten, redirect_target = self.manager.extract_user_from_http_request(request, users)
+
+        self.assertEqual(user["id"], "user1")
+        self.assertEqual(
+            rewritten,
+            (
+                b"GET / HTTP/1.1\r\n"
+                b"Host: 10.200.200.113:8080\r\n"
+                b"Connection: keep-alive\r\n"
+                b"\r\n"
+            ),
+        )
+        self.assertIsNone(redirect_target)
+
     def test_wait_until_ready_applies_stabilization_delay(self):
         sleep_calls = []
         clock = {"now": 0.0}