[Bugfix] Bypass authorization API token for preflight requests (#4862)

vllm/entrypoints/openai/api_server.py

@@ -154,6 +154,8 @@ if __name__ == "__main__":
         @app.middleware("http")
         async def authentication(request: Request, call_next):
             root_path = "" if args.root_path is None else args.root_path
+            if request.method == "OPTIONS":
+                return await call_next(request)
             if not request.url.path.startswith(f"{root_path}/v1"):
                 return await call_next(request)
             if request.headers.get("Authorization") != "Bearer " + token: