Fix Python 3.12 CI

Ignore warnings, fix others and work around
python/cpython#105162

dummyserver/handlers.py

@@ -8,7 +8,7 @@
 import sys
 import typing
 import zlib
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, timezone
 from http.client import responses
 from io import BytesIO
 from urllib.parse import urlsplit
@@ -344,7 +344,9 @@ def redirect_after(self, request: httputil.HTTPServerRequest) -> Response:
         date = params.get("date")
         if date:
             retry_after = str(
-                httputil.format_timestamp(datetime.utcfromtimestamp(float(date)))
+                httputil.format_timestamp(
+                    datetime.fromtimestamp(float(date), tz=timezone.utc)
+                )
             )
         else:
             retry_after = "1"

dummyserver/proxy.py

@@ -45,29 +45,6 @@ class ProxyHandler(tornado.web.RequestHandler):
     SUPPORTED_METHODS = ["GET", "POST", "CONNECT"]  # type: ignore[assignment]
 
     async def get(self) -> None:
-        async def handle_response(response: tornado.httpclient.HTTPResponse) -> None:
-            if response.error and not isinstance(
-                response.error, tornado.httpclient.HTTPError
-            ):
-                self.set_status(500)
-                self.write("Internal server error:\n" + str(response.error))
-                await self.finish()
-            else:
-                self.set_status(response.code)
-                for header in (
-                    "Date",
-                    "Cache-Control",
-                    "Server",
-                    "Content-Type",
-                    "Location",
-                ):
-                    v = response.headers.get(header)
-                    if v:
-                        self.set_header(header, v)
-                if response.body:
-                    self.write(response.body)
-                await self.finish()
-
         upstream_ca_certs = self.application.settings.get("upstream_ca_certs", None)
         ssl_options = None
 
@@ -87,16 +64,21 @@ async def handle_response(response: tornado.httpclient.HTTPResponse) -> None:
         )
 
         client = tornado.httpclient.AsyncHTTPClient()
-        try:
-            response = await client.fetch(req)
-            await handle_response(response)
-        except tornado.httpclient.HTTPError as e:
-            if hasattr(e, "response") and e.response:
-                await handle_response(e.response)
-            else:
-                self.set_status(500)
-                self.write("Internal server error:\n" + str(e))
-                self.finish()
+        response = await client.fetch(req, raise_error=False)
+        self.set_status(response.code)
+        for header in (
+            "Date",
+            "Cache-Control",
+            "Server",
+            "Content-Type",
+            "Location",
+        ):
+            v = response.headers.get(header)
+            if v:
+                self.set_header(header, v)
+        if response.body:
+            self.write(response.body)
+        await self.finish()
 
     async def post(self) -> None:
         await self.get()

pyproject.toml

@@ -99,7 +99,11 @@ filterwarnings = [
     '''default:ssl\.PROTOCOL_TLSv1_2 is deprecated:DeprecationWarning''',
     '''default:unclosed .*:ResourceWarning''',
     '''default:ssl NPN is deprecated, use ALPN instead:DeprecationWarning''',
-    '''default:URLs without a scheme''',
+    # https://github.com/pytest-dev/pytest/issues/10977
+    '''default:ast\.(Num|NameConstant|Str) is deprecated and will be removed in Python 3\.14; use ast\.Constant instead:DeprecationWarning:_pytest''',
+    '''default:Attribute s is deprecated and will be removed in Python 3\.14; use value instead:DeprecationWarning:_pytest''',
+    # https://github.com/dateutil/dateutil/issues/1284
+    '''default:datetime\.utcfromtimestamp\(\) is deprecated and scheduled for removal in a future version\.*:DeprecationWarning:dateutil''',
 ]
 
 [tool.isort]