sync passthrough_url to HttpUrl to match upstream PR llamastack#5134 update

Author: skamenan7

src/llama_stack/providers/remote/inference/passthrough/__init__.py

@@ -4,7 +4,7 @@
 # This source code is licensed under the terms described in the LICENSE file in
 # the root directory of this source tree.
 
-from pydantic import BaseModel, ConfigDict, SecretStr
+from pydantic import BaseModel, ConfigDict, HttpUrl, SecretStr
 
 from .config import PassthroughImplConfig
 
@@ -18,7 +18,7 @@ class PassthroughProviderDataValidator(BaseModel):
     # Without it, Pydantic drops them before build_forwarded_headers() can read them.
     model_config = ConfigDict(extra="allow")
 
-    passthrough_url: str | None = None
+    passthrough_url: HttpUrl | None = None
     passthrough_api_key: SecretStr | None = None
 
 

src/llama_stack/providers/remote/inference/passthrough/passthrough.py

@@ -140,7 +140,7 @@ def _get_passthrough_url(self) -> str:
             raise ValueError(
                 'Pass url of the passthrough endpoint in the header X-LlamaStack-Provider-Data as { "passthrough_url": <your passthrough url>}'
             )
-        return provider_data.passthrough_url
+        return str(provider_data.passthrough_url)
 
     async def openai_completion(
         self,

tests/unit/providers/inference/test_passthrough_forward_headers.py

@@ -362,15 +362,15 @@ def test_accepts_empty_payload(self):
 
     def test_accepts_only_passthrough_url(self):
         v = PassthroughProviderDataValidator(passthrough_url="http://x.example.com")
-        assert v.passthrough_url == "http://x.example.com"
+        assert str(v.passthrough_url) == "http://x.example.com/"
         assert v.passthrough_api_key is None
 
     def test_accepts_both_fields(self):
         v = PassthroughProviderDataValidator(
             passthrough_url="http://x.example.com",
             passthrough_api_key="sk-test",
         )
-        assert v.passthrough_url == "http://x.example.com"
+        assert str(v.passthrough_url) == "http://x.example.com/"
         assert v.passthrough_api_key is not None
         assert v.passthrough_api_key.get_secret_value() == "sk-test"