Twilio POST request showing GET error: 405 Method Not Allowed

The issue is when Twilio sends a POST request to the /incoming-call endpoint, my server is returning a 405 Method Not Allowed error. The error log also shows that the server is attempting to handle the request as a GET request instead of a POST request.

Why is my server treating Twilio's POST request as a GET request, and how do I resolve the 405 Method Not Allowed error?

Is there any additional configuration required on Twilio or Uvicorn to properly handle POST requests?

My development environment:

Server: Uvicorn with FastAPI
Twilio Webhook Endpoint: /incoming-call
Language: Python 3.9
Framework: FastAPI
Hosting: Local environment or cloud server

Verified the Twilio Webhook Configuration:

I double-checked that the webhook URL configured in Twilio is correct (/incoming-call endpoint). Tested the Endpoint Locally:

I sent a POST request manually to the /incoming-call endpoint using Postman, and the server responded correctly with a 200 OK.

Checked Server Code:

I ensured that my FastAPI route is configured to handle only POST requests, as shown below:

@app.post("/incoming-call")
async def incoming_call(request: dict):
    return Response("Call received", status_code=200)

Reviewed Server Logs:

I noticed in the logs that the server is treating the request as a GET request instead of a POST request:

INFO: 172.31.196.73:48386 - "GET /incoming-call HTTP/1.1" 405 Method Not Allowed

What was I expecting?

I expected the server to successfully process the POST request sent by Twilio to the /incoming-call endpoint and return a 200 OK status. Instead, the server is returning a 405 Method Not Allowed error.