Drop use of httpx as a test dependency (#7950)

We only use it in one test and are getting rid of it as a real
dependency (see #7927), so let's just drop it.

pyproject.toml

@@ -81,8 +81,6 @@ test = [
     'sphinxcontrib-serializinghtml<1.1.10',
     'sphinxcontrib-qthelp<1.0.7',
     'sphinx_code_tabs~=0.5.3',
-
-    'httpx~=0.24.1',
 ]
 
 docs = [

tests/test_server_ops.py

@@ -35,10 +35,11 @@
 import tempfile
 import time
 import unittest
+import urllib.error
+import urllib.request
 import uuid
 
 import edgedb
-import httpx
 from edgedb import errors
 
 from edb import protocol
@@ -1028,15 +1029,25 @@ async def test_server_ops_mtls_http_transports(self):
             security=args.ServerSecurityMode.Strict,
         ) as sd:
             def test(url):
-                resp = httpx.get(url, verify=sd.tls_cert_file)
-                self.assertFalse(resp.is_success)
-
-                resp = httpx.get(
-                    url,
-                    verify=sd.tls_cert_file,
-                    cert=(str(client_ssl_cert_file), str(client_ssl_key_file)),
+                # Connection without the client cert fails
+                tls_context = ssl.create_default_context(
+                    ssl.Purpose.SERVER_AUTH,
+                    cafile=sd.tls_cert_file,
+                )
+                error_code = None
+                try:
+                    resp = urllib.request.urlopen(url, context=tls_context)
+                except urllib.error.HTTPError as e:
+                    error_code = e.code
+                self.assertEqual(error_code, 401)
+
+                # But once we load the client it will work
+                tls_context.load_cert_chain(
+                    client_ssl_cert_file,
+                    client_ssl_key_file,
                 )
-                self.assertTrue(resp.is_success)
+                resp = urllib.request.urlopen(url, context=tls_context)
+                self.assertEqual(resp.status, 200)
 
             test(f'https://{sd.host}:{sd.port}/metrics')
             test(f'https://{sd.host}:{sd.port}/server/status/alive')