fix: Lock httpx version to fix L0_openai--trtllm test failures (#7870) (#7881)

Co-authored-by: Ryan McCormick <rmccormick@nvidia.com>

Author: yinggeh

python/openai/openai_frontend/main.py

@@ -65,11 +65,11 @@ def start_kserve_frontends(server, args):
         from tritonfrontend import KServeGrpc, KServeHttp
 
         http_options = KServeHttp.Options(address=args.host, port=args.kserve_http_port)
-        http_service = KServeHttp.Server(server, http_options)
+        http_service = KServeHttp(server, http_options)
         http_service.start()
 
         grpc_options = KServeGrpc.Options(address=args.host, port=args.kserve_grpc_port)
-        grpc_service = KServeGrpc.Server(server, grpc_options)
+        grpc_service = KServeGrpc(server, grpc_options)
         grpc_service.start()
 
     except ModuleNotFoundError:

python/openai/requirements.txt

@@ -26,4 +26,7 @@
 
 # FastAPI Application
 fastapi==0.111.1
+# Fix httpx version to avoid bug in openai library:
+# https://community.openai.com/t/error-with-openai-1-56-0-client-init-got-an-unexpected-keyword-argument-proxies/1040332/3
+httpx==0.27.2
 openai==1.40.6