curl --request POST \
  --url https://tryno.io/api/posts/{postId}/comments \
  --header 'Content-Type: application/json' \
  --cookie __session= \
  --data '
{
  "body": "<string>"
}
'

const options = {
  method: 'POST',
  headers: {cookie: '__session=', 'Content-Type': 'application/json'},
  body: JSON.stringify({body: JSON.stringify('<string>')})
};

fetch('https://tryno.io/api/posts/{postId}/comments', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://tryno.io/api/posts/{postId}/comments"

payload = { "body": "<string>" }
headers = {
    "cookie": "__session=",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

{}

{
  "error": "<string>"
}

{
  "error": "<string>"
}