How to change the value of request body?

[Songjiadong]

I want to change the request body value of simple_invoke,would you give me a demo? I can't change request body value.
Based on my experience with Java and C #, I believe this can be solved, but I am not very familiar with FastAPI . Can you help me?
Thanks!

def add_one(x: int) -> int:
    """Add one to the given number."""
    return x + 1


chain = RunnableLambda(add_one)

api_handler = APIHandler(chain, path="/simple")


# First register the endpoints without documentation
@app.post("/simple/invoke", include_in_schema=False)
async def simple_invoke(request: Request) -> Response:
    """Handle a request."""
    ### NOTE: I want change the value of request body at this position !!!! for example:  if  value of request body equals '1',I want change it to '100'
    return await api_handler.invoke(request)

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[Songjiadong]

@app.post(f"/{APP_USER_NAME}/invoke", include_in_schema=True)
async def invoke(request: Request) -> Response:
    request_json = await request.json()
    input = request_json["input"]["input"]
    rag_message = retriever.rag(input=input, k=2, score_threshold=0.9, verbose=verbose)
    if verbose is True:
        print("\033[0;33m" + f"my prompt is: {rag_message}" + "\033[0m")
    async def receive_func() -> Message:
        m: dict[str, Any] = {"input": {"input": rag_message}}
        s = json.dumps(m, ensure_ascii=False)
        result: Message = {
            "type": "http.request",
            "body": s.encode("utf-8")
        }
        return result
    r = Request(scope=request.scope, receive=receive_func)
    return await api_handler.invoke(r)