add UA to requests (#61)

pydantic_ai/models/__init__.py

@@ -261,4 +261,15 @@ def cached_async_http_client(timeout: int = 600, connect: int = 5) -> httpx.Asyn
     The default timeouts match those of OpenAI,
     see <https://github.com/openai/openai-python/blob/v1.54.4/src/openai/_constants.py#L9>.
     """
-    return httpx.AsyncClient(timeout=httpx.Timeout(timeout=timeout, connect=connect))
+    return httpx.AsyncClient(
+        timeout=httpx.Timeout(timeout=timeout, connect=connect),
+        headers={'User-Agent': get_user_agent()},
+    )
+
+
+@cache
+def get_user_agent() -> str:
+    """Get the user agent string for the HTTP client."""
+    from .. import __version__
+
+    return f'pydantic-ai/{__version__}'

pydantic_ai/models/gemini.py

@@ -56,6 +56,7 @@
     StreamTextResponse,
     cached_async_http_client,
     check_allow_model_requests,
+    get_user_agent,
 )
 
 GeminiModelName = Literal['gemini-1.5-flash', 'gemini-1.5-flash-8b', 'gemini-1.5-pro', 'gemini-1.0-pro']
@@ -182,6 +183,7 @@ async def _make_request(self, messages: list[Message], streamed: bool) -> AsyncI
         headers = {
             'X-Goog-Api-Key': self.api_key,
             'Content-Type': 'application/json',
+            'User-Agent': get_user_agent(),
         }
         url = self.url_template.format(
             model=self.model_name, function='streamGenerateContent' if streamed else 'generateContent'

tests/models/test_gemini.py

@@ -344,9 +344,12 @@ async def get_gemini_client(
     def create_client(response_or_list: ResOrList) -> httpx.AsyncClient:
         index = 0
 
-        def handler(_request: httpx.Request) -> httpx.Response:
+        def handler(request: httpx.Request) -> httpx.Response:
             nonlocal index
 
+            ua = request.headers.get('User-Agent')
+            assert isinstance(ua, str) and ua.startswith('pydantic-ai')
+
             if isinstance(response_or_list, Sequence):
                 response = response_or_list[index]
                 index += 1