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VWS API Getting 401 - Unauthorized error

Hi,

I am creating a GET request to fetch the target information with Headers(date and Authorization) but always getting the 401- Unauthorized error.

The date header is generated in the proper GMT format and also the authorization signature.

The GET request https://vws.vuforia.com/targets/f6cb6f3c04aa46d9b1daa1194c63f472

And the Header information - 

{Date: Wed, 02 Jul 2014 12:40:08 GMT Authorization: VWS 81d6f43f005818852d4298fc33ca21b4d5d5440b:CFvhn/6kUqGmgOOgoGoMWms/gkU=}

Please suggest the possible reasons due to which the 401 error reported.

Amit Kumar