Can't access or print any request data with fastapi

I have a simple fastapi endpoint where I want to receive a string value. In this case I tried it with a json body, but basically it doesn't need to be json. I really need only a simple string to separate the requests from each other. Unfortunately I can't access any of the request parameters with a GET method. I also tried POST method instead, but I get an error:

request:

url = "http://127.0.0.1:5000/ping/"

payload=json.dumps({"key":"test"})
headers = {
"Content-Type": "application/json"
            }
response = requests.request("POST", url, headers=headers, json=payload)

print(response.text)

api:

@app.get("/ping/{key}")
async def get_trigger(key: Request):

    key = key.json()
    test = json.loads(key)
    print(test)
    test2 = await key.json()
    print(key)
    print(test2)


    return 

I can't print anything

with post or put:

@app.post("/ping/{key}")
async def get_trigger(key: Request):
...
   or

@app.put("/ping/{key}")
async def get_trigger(key: Request):

I get an 405 Method not allowed.

How can I get this fixed?

source https://stackoverflow.com/questions/71563503/cant-access-or-print-any-request-data-with-fastapi