Custom Response Headers

curl 'https://tcpdata.com/response-headers?Custom-Header=value&X-Test=123'

fetch('https://tcpdata.com/response-headers?Custom-Header=value')
  .then(res => {
    console.log(res.headers.get('Custom-Header'));
    return res.json();
  });

import requests

response = requests.get('https://tcpdata.com/response-headers',
    params={'Custom-Header': 'value'})
print(response.json())