How to pass the resr Api url with the header to return json

Question

Hi ,
  I want to pass the following url and header to return the json object as output.
can anyone help me i don.t have any idea regarding the inplementation in aspx page.
Url is:https://rest.idc.com/item/!type/document/research/other/!taxonomy/GEOGRAPHY/3_328?order=DATE

Following header needs to be available during the request. 
Accept: application/vnd.idc.com-v2+json


Anybody has an idea please helpme.
Thank you
Regards
priya