Visual Studio Online - Add Hyperlinks to a Task

[

1. {
   • "op":"test",
   • "path":"/rev",
   • "value":3  <- I do not understand this Value? Need it 1, 2, 3 ...??? Desc: New value to set. ???
   },
2. {
   • "op":"add",
   • "path":"/fields/System.History",
   • "value":"Adding an Hyperlink"
   },
3. {
   • "op":"add",
   • "path":"/relations/-",
   • "value":{
     • "rel":"Hyperlink",
     • "url":"https://www.google.de",
     • "attributes":{
       • "comment":"1234.jpg"
       }
     }
   }

]

Do not work.. why? Error 405

The Creation of a work item are working and the method for the post requests are the same. I use the information of the site https://www.visualstudio.com/integrate/api/wit/work-items#Createaworkitem.

Is there a method to add more than one relations at the "create" of a work item.

I hope for help.