fix: Make aiohttp an optional dependency, bump aiohttp version upperbound, and ensure HttpOptions.async_client_args propagates to custom aiohttp.ClientSession request args for proxy etc.

fixes #2090
fixes #2051
fixes #1950

PiperOrigin-RevId: 875260168

Author: yinghsienwu

google/genai/_api_client.py

@@ -747,11 +747,10 @@ def __init__(
 
         if self._http_options.aiohttp_client:
           self._aiohttp_session = self._http_options.aiohttp_client
-        else:
-          # Do it once at the genai.Client level. Share among all requests.
-          self._async_client_session_request_args = (
-              self._ensure_aiohttp_ssl_ctx(self._http_options)
-          )
+        # Do it once at the genai.Client level. Share among all requests.
+        self._async_client_session_request_args = (
+            self._ensure_aiohttp_ssl_ctx(self._http_options)
+        )
       except ImportError:
         pass
 

pyproject.toml

@@ -31,15 +31,14 @@ dependencies = [
     "pydantic>=2.9.0, <3.0.0",
     "requests>=2.28.1, <3.0.0",
     "tenacity>=8.2.3, <9.2.0",
-    "websockets>=13.0.0, <15.1.0",
+    "websockets>=13.0.0, <17.0",
     "typing-extensions>=4.11.0, <5.0.0",
     "distro>=1.7.0, <2",
     "sniffio",
-    "aiohttp>=3.10.11",
 ]
 
 [project.optional-dependencies]
-aiohttp = ["aiohttp<3.13.3"]
+aiohttp = ["aiohttp>=3.10.11, <4.0.0"]
 local-tokenizer = ["sentencepiece>=0.2.0", "protobuf"]
 
 [project.urls]

requirements.txt

@@ -27,7 +27,7 @@ rsa==4.9
 tenacity==8.2.3
 typing_extensions>=4.14.1
 urllib3==2.5.0
-websockets==15.0.0
+websockets==16.0
 mcp>=1.14.0; python_version > '3.9'
 sentencepiece>=0.2.0
 protobuf