AWS API Dlang, hmac sha256 function.

[holo via Digitalmars-d-learn]

OK i find out error, in addRequestHeader i was using ":" after 
header name what casing problem. I removed it and now im getting 
"unauthorized". Here is how it looks right now:

  HTTP/1.1 401 Unauthorized\r\n
         [Expert Info (Chat/Sequence): HTTP/1.1 401 
Unauthorized\r\n]
         Request Version: HTTP/1.1
         Status Code: 401
         Response Phrase: Unauthorized
     Transfer-Encoding: chunked\r\n
     Date: Fri, 09 Oct 2015 16:22:47 GMT\r\n
     Server: AmazonEC2\r\n
     \r\n
     [HTTP response 1/2]
     [Next request in frame: 8371]
     HTTP chunked response
         Data chunk (254 octets)
             Chunk size: 254 octets
             Data (254 bytes)

In data field i can read:

"AWS was not able to validate provided access credentials" Is my 
signing process incorrect?