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Karthick RajaKarthick Raja 

How to set the Authorization Header in Apex callout

Hi folks,
          Can anyone tell me how to set the authorization header in Apex Callout?
I have to set the below items in Authorization Header
1.Key,
2.Nonce
3.Timestamp
4.version 

Please help!
RamuRamu (Salesforce Developers) 
The below article might help

https://developer.salesforce.com/page/Apex_Web_Services_and_Callouts