User Avatar API Endpoint 404 on POST, 200 on GET

We don't directly use PUT requests in REST, instead we use a POST request with a Rest-Method header of PUT.  There is an example and explanation here:  https://community.telligent.com/community/12/a/developer-training/DT14/making-requests#put

Try switching to a POST request in Postman and adding the Rest-Method header PUT.

Thank you!

Now I am trying to execute this REST API call from Javascript so I can create an automation that randomizes users Avatars, but I am getting a 404 error from the Automation Studio.

var url="http://localhost:8000/api.ashx/v2/users/2114/avatar.json";
var Data= '{"userid": 2114, AvatarUrl": "'+images[random]+'"}';
var httpResponseResponse = core_v2_http.Post(url, { Data: Data, Headers: {"Request-Method": "PUT","Rest-User-Token": '<TOKEN>', 'Content-Type': 'application/json'}});
return httpResponseResponse;

Thank you!

Now I am trying to execute this REST API call from Javascript so I can create an automation that randomizes users Avatars, but I am getting a 404 error from the Automation Studio.

var url="http://localhost:8000/api.ashx/v2/users/2114/avatar.json";
var Data= '{"userid": 2114, AvatarUrl": "'+images[random]+'"}';
var httpResponseResponse = core_v2_http.Post(url, { Data: Data, Headers: {"Request-Method": "PUT","Rest-User-Token": '<TOKEN>', 'Content-Type': 'application/json'}});
return httpResponseResponse;

"Request-Method" should probably be Rest-Method

You are correct. Thank you!!