function send_patch(url) {
  return fetch(url,{
    method: "PATCH",
    credentials: "include",
    cache: "no-cache",
    headers: {
      'Content-Type': 'application/json',
      'X-CSRFToken': getCookie('csrftoken'),
    },
  })
  .then(response => response.json());
}

send_patch(url)
.then(response => {
  if (response.message === "success") {
    button.parentElement.innerHTML = response.technic;
  } else {
    console.error("The technician is not attached.")
  }
})
.catch(error => console.error(error));