POST request to a function ends in 500 server error.

const response = await fetch("http://<url>.appwrite.global/", 
                {
                  method: 'POST',
                  headers: {'Content-Type': 'application/json'},
                  body: JSON.stringify(arrayIds),
                }); 

from appwrite.client import Client
import os
import json
def main(context):
    if context.req.method == "POST":
        return context.res.send("Response to a POST request")

    return context.res.json({
        "Response": "Default response",
    })