Unable to connect to DocDB via REST API.

getting following error message

{    "code": "unauthorized",    "message": "the input authorization token can't serve request. please check expected payload built per protocol, , check key being used. server used following payload sign: 'get\ndbs\n\nmon, 16 feb 2015 23:01:28 gmt\n\n'"  }

all trying list dbs under account using nodejs

here code:

i have replaced original master code , doc db url security purpose

var rest = require('restler');

var targeturl = "https://xyzdocdb.documents.azure.com/dbs";
     var verb = "get";
     var resourceid = "";
     var resourcetype = "dbs";
     var headers = ["'x-ms-date' : 'mon, 16 feb 2015 23:01:28 gmt'", "'date' : 'wed, 18 feb 2015 05:59:28 gmt'"];
   
    var masterkeybase64 = "my master key";
     var authheader = getauthorizationheader(verb, resourceid, resourcetype, headers, masterkeybase64);
     var options = { "method": "get", "headers":{"authorization": authheader, "x-ms-date": "mon, 16 feb 2015 23:01:28 gmt", "content-type":"application/json"} };
     console.log(options);

     // send rest request

     dbsvc = rest.request( targeturl, options );
      dbsvc.on( 'complete', function(result, response)
        { // have reply
          // fetch json response
          retjson = json.parse(response.raw);
          helper.httpjsonresponse(httpres,statuscode,retjson);
        });

// function getauthorizationheader azure document

var getauthorizationheader = function(verb, resourceid, resourcetype, headers, masterkeybase64)   {       var key = new buffer(masterkeybase64, "base64");       var stringtosign = (verb || "") + "\n" +                 (resourcetype || "") + "\n" +                 (resourceid || "") + "\n" +                 (headers["x-ms-date"] || "") + "\n" +                 (headers["date"] || "") + "\n";       var body = new buffer(stringtosign.tolowercase(), "utf8");       var signature = crypto.createhmac("sha256", key).update(body).digest("base64");       var mastertoken = "master";          var tokenversion = "1.0";          return "type=" + mastertoken +"&ver=" + tokenversion + "&sig=" + signature;  }
an full working example using nodejs useful rather bits , pieces of code.
thank you
-rk

is there reason not using node.js sdk ? using don't have worry of stuff headers etc.

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