Bypass proxies for loopback engines

tests/test_core_flow.py

@@ -8,7 +8,7 @@ from pathlib import Path
 from unittest import mock
 
 from aituner.cli import main as cli_main
-from aituner.http_client import _openai_url
+from aituner.http_client import _openai_url, _should_bypass_proxy
 from aituner.job import append_job, build_trial_job
 from aituner.llm import build_prompt, parse_proposal_text
 from aituner.search import ThresholdProbe, binary_search_max_feasible
@@ -833,6 +833,11 @@ class CoreFlowTests(unittest.TestCase):
             "http://example.com/v1/chat/completions",
         )
 
+    def test_loopback_urls_bypass_proxy(self) -> None:
+        self.assertTrue(_should_bypass_proxy("http://127.0.0.1:8000/v1/models"))
+        self.assertTrue(_should_bypass_proxy("http://localhost:8000/health"))
+        self.assertFalse(_should_bypass_proxy("http://example.com/v1/models"))
+
 
 if __name__ == "__main__":
     unittest.main()