I tried exactly the PHP example on
https://developer.spreadshirt.net/display/API/Uploading+Designs+to+Spreadshirt+using+Spreadshirt+API+v1
but step 3 will raise up an error
HTTP/1.1 403 Forbidden
Server: AkamaiGHost
Mime-Version: 1.0
Content-Type: text/html
Content-Length: 329
Cache-Control: max-age=0
Date: Sun, 04 Mar 2018 17:25:10 GMT
Connection: close
Timing-Allow-Origin: *
Access Denied
You don’t have permission to access “http://image.spreadshirtmedia.net/image-server/v1/designs/144840185?” on this server.
Reference #18.45d96b68.1520184310.e912340
What am i doing wrong? Why no access?