Here is how I do the request in curl:
curl -v --request PATCH -H "Authorization: token TOKEN-VALUE-FROM-PREVIOUS-CALL" -d '{"description": "updated gist","public": true,"files": {"file1.txt": {"content": "String file contents are now updated"}}}' https://api.github.com/gists/GIST-ID-FORM-PREVIOUS-CALL
I have tried a few node libraries to make that "patch" request but no success. I can also do the same thing in client side with jQuery.ajax but can't get it working on the server side. Thanks in advance.