diff --git a/lib/oauth.js b/lib/oauth.js
index 6ff3aea..6418144 100644
--- a/lib/oauth.js
+++ b/lib/oauth.js
@@ -2,7 +2,7 @@ var crypto= require('crypto'),
     sha1= require('./sha1'),
     http= require('http'),
     URL= require('url'),
-    querystring= require('querystring');
+    querystring= require('querystring'); 
 
 exports.OAuth= function(requestUrl, accessUrl, consumerKey, consumerSecret, version, authorize_callback, signatureMethod, nonceSize, customHeaders) {
   this._requestUrl= requestUrl;
@@ -51,14 +51,14 @@ exports.OAuth.prototype._decodeData= function(toDecode) {
 }
 
 exports.OAuth.prototype._getSignature= function(method, url, parameters, tokenSecret) {
-  var signatureBase= this._createSignatureBase(method, url, parameters);
-  return this._createSignature( signatureBase, tokenSecret );
+  var signatureBase= this._createSignatureBase(method, url, parameters);  
+  return this._createSignature( signatureBase, tokenSecret ); 
 }
 
 exports.OAuth.prototype._normalizeUrl= function(url) {
   var parsedUrl= URL.parse(url, true)
    var port ="";
-   if( parsedUrl.port ) {
+   if( parsedUrl.port ) { 
      if( (parsedUrl.protocol == "http:" && parsedUrl.port != "80" ) ||
          (parsedUrl.protocol == "https:" && parsedUrl.port != "443") ) {
            port= ":" + parsedUrl.port;
@@ -66,7 +66,7 @@ exports.OAuth.prototype._normalizeUrl= function(url) {
    }
 
   if( !parsedUrl.pathname  || parsedUrl.pathname == "" ) parsedUrl.pathname ="/";
-
+   
   return parsedUrl.protocol + "//" + parsedUrl.hostname + port + parsedUrl.pathname;
 }
 
@@ -77,7 +77,7 @@ exports.OAuth.prototype._buildAuthorizationHeaders= function(orderedParameters)
      // Whilst the all the parameters should be included within the signature, only the oauth_ arguments
      // should appear within the authorization header.
      var m = orderedParameters[i][0].match('^oauth_');
-     if( m && m[0] === "oauth_") {
+     if( m && ( m[0] === "oauth_" || m[0] === 'scope' ) ) {
       authHeader+= this._encodeData(orderedParameters[i][0])+"=\""+ this._encodeData(orderedParameters[i][1])+"\",";
      }
   }
@@ -88,15 +88,15 @@ exports.OAuth.prototype._buildAuthorizationHeaders= function(orderedParameters)
 // Takes a literal in, then returns a sorted array
 exports.OAuth.prototype._sortRequestParams= function(argumentsHash) {
   var argument_pairs= [];
-  for(var key in argumentsHash ) {
+  for(var key in argumentsHash ) {   
       argument_pairs[argument_pairs.length]= [key, argumentsHash[key]];
   }
   // Sort by name, then value.
   argument_pairs.sort(function(a,b) {
       if ( a[0]== b[0] )  {
-        return a[1] < b[1] ? -1 : 1;
+        return a[1] < b[1] ? -1 : 1; 
       }
-      else return a[0] < b[0] ? -1 : 1;
+      else return a[0] < b[0] ? -1 : 1;  
   });
 
   return argument_pairs;
@@ -110,19 +110,19 @@ exports.OAuth.prototype._normaliseRequestParams= function(arguments) {
       args+= "="
       args+= this._encodeData( argument_pairs[i][1] );
       if( i < argument_pairs.length-1 ) args+= "&";
-  }
+  }     
   return args;
 }
 
 exports.OAuth.prototype._createSignatureBase= function(method, url, parameters) {
-  url= this._encodeData( this._normalizeUrl(url) );
+  url= this._encodeData( this._normalizeUrl(url) ); 
   parameters= this._encodeData( parameters );
   return method.toUpperCase() + "&" + url + "&" + parameters;
 }
 
 exports.OAuth.prototype._createSignature= function(signatureBase, tokenSecret) {
    if( tokenSecret === undefined ) var tokenSecret= "";
-   else tokenSecret= this._encodeData( tokenSecret );
+   else tokenSecret= this._encodeData( tokenSecret ); 
    // consumerSecret is already encoded
    var key= this._consumerSecret + "&" + tokenSecret;
 
@@ -147,7 +147,7 @@ exports.OAuth.prototype._getNonce= function(nonceSize) {
    var chars= this.NONCE_CHARS;
    var char_pos;
    var nonce_chars_length= chars.length;
-
+   
    for (var i = 0; i < nonceSize; i++) {
        char_pos= Math.floor(Math.random() * nonce_chars_length);
        result[i]=  chars[char_pos];
@@ -194,8 +194,8 @@ exports.OAuth.prototype._performSecureRequest= function( oauth_token, oauth_toke
   var sig= this._getSignature( method,  url,  this._normaliseRequestParams(oauthParameters), oauth_token_secret);
   var orderedParameters= this._sortRequestParams( oauthParameters );
   orderedParameters[orderedParameters.length]= ["oauth_signature", sig];
-
-  var query="";
+  
+  var query=""; 
   for( var i= 0 ; i < orderedParameters.length; i++) {
     query+= this._encodeData(orderedParameters[i][0])+"="+ this._encodeData(orderedParameters[i][1]) + "&";
   }
@@ -222,7 +222,7 @@ exports.OAuth.prototype._performSecureRequest= function( oauth_token, oauth_toke
 
   headers["Content-length"]= post_body ? post_body.length : 0; //Probably going to fail if not posting ascii
   headers["Content-Type"]= post_content_type;
-
+   
   var path;
   if( !parsedUrl.pathname  || parsedUrl.pathname == "" ) parsedUrl.pathname ="/";
   if( parsedUrl.query ) path= parsedUrl.pathname + "?"+ parsedUrl.query ;
@@ -230,7 +230,7 @@ exports.OAuth.prototype._performSecureRequest= function( oauth_token, oauth_toke
 
   var request = oauthProvider.request(method,  path , headers);
   if( callback ) {
-    var data="";
+    var data=""; 
     var self= this;
     request.addListener('response', function (response) {
       response.setEncoding('utf8');
@@ -245,7 +245,7 @@ exports.OAuth.prototype._performSecureRequest= function( oauth_token, oauth_toke
         }
       });
     });
-
+  
     request.socket.addListener("error",callback);
     if( method == "POST" && post_body != null && post_body != "" ) {
       request.write(post_body);
@@ -258,7 +258,7 @@ exports.OAuth.prototype._performSecureRequest= function( oauth_token, oauth_toke
     }
     return request;
   }
-
+  
   return;
 }
 
@@ -269,7 +269,7 @@ exports.OAuth.prototype.getOAuthAccessToken= function(oauth_token, oauth_token_s
   } else {
     extraParams.oauth_verifier= oauth_verifier;
   }
-
+  
    this._performSecureRequest( oauth_token, oauth_token_secret, "GET", this._accessUrl, extraParams, "", null, function(error, data, response) {
          if( error ) callback(error);
          else {
@@ -305,14 +305,14 @@ exports.OAuth.prototype.post= function(url, oauth_token, oauth_token_secret, pos
   }
   return this._performSecureRequest( oauth_token, oauth_token_secret, "POST", url, extra_params, post_body, post_content_type, callback );
 }
-
+ 
 exports.OAuth.prototype.getOAuthRequestToken= function(extraParams, callback) {
   if( typeof extraParams == "function" ){
     callback = extraParams;
     extraParams = {};
   }
 
-  // Callbacks are 1.0A related
+  // Callbacks are 1.0A related 
   if( this._authorize_callback ) {
     extraParams["oauth_callback"]= this._authorize_callback;
   }
@@ -361,12 +361,12 @@ exports.OAuth.prototype.signUrl= function(url, oauth_token, oauth_token_secret,
   var orderedParameters= this._sortRequestParams( collectedParameters );
   orderedParameters[orderedParameters.length]= ["oauth_signature", sig];
 
-  var query="";
+  var query=""; 
   for( var i= 0 ; i < orderedParameters.length; i++) {
     query+= orderedParameters[i][0]+"="+ this._encodeData(orderedParameters[i][1]) + "&";
   }
   query= query.substring(0, query.length-1);
-
+ 
   return parsedUrl.protocol + "//"+ parsedUrl.host + parsedUrl.pathname + "?" + query;
 };