Location of invitation sent

[xdatac13]

I want to find a way to check on the invitations I made with "add_connection"

In the Response header of add_connection there is a parameter named "Location" which I think is the relative URL of the place where is stored data about newly created invitation.

So i tried to retrieve it with linkedin._fetch(location_relative_url) , but I get a 400 error

For example the location_relative_url is like '/voyagerGrowthNormInvitations/7253503640567476224',

Any clue about this ?