from fastapi import Request


async def case_sensitive_headers_middleware(request: Request, call_next):
    raw_headers = request.scope.get("raw_headers", [])
    normalized = {}
    for i in range(0, len(raw_headers), 2):
        key = raw_headers[i].decode("utf-8")
        value = raw_headers[i + 1].decode("utf-8")
        normalized[key] = value
    request.scope["raw_headers_dict"] = normalized
    return await call_next(request)