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Here's an example implementation using FastAPI, Redis for caching, and a load balancer: ```python from fastapi import FastAPI, Depends, HTTPException, status from fastapi.security import OAuth2PasswordBearer from pydantic import BaseModel import requests from tenacity import retry, stop_after_attempt, wait_fixed import redis from fastapi_limiter import FastAPILimiter from fastapi_limiter.depends import RateLimiter app = FastAPI() # Initialize Redis client for caching r = redis.Redis(host='localhost', port=6379, db=0) # OAuth2 scheme for authentication oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token") # Dependency to validate JWT token and check roles async def get_current_user(token: str = Depends(oauth2_scheme)): # Replace with actual validation logic using Keycloak if not token: raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Not authenticated") return token # Define the request model class SearchQuery(BaseModel): query: str limit: int # Define the response model class SearchResult(BaseModel): id: int title: str content: str class SearchResponse(BaseModel): results: List[SearchResult]