diff --git a/NEWS.md b/NEWS.md
index 8abe4ff8..38a7988d 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,6 @@
 1.3.10
 ------
+* Fixed problem identifying OAuth request protocol
 
 1.3.9
 -----
diff --git a/app/controllers/app.js b/app/controllers/app.js
index aeceeb14..c522709b 100755
--- a/app/controllers/app.js
+++ b/app/controllers/app.js
@@ -109,6 +109,7 @@ function handleQuery(req, res) {
     var gn        = "the_geom"; // TODO: read from configuration file
     var user_id;
     var tableCacheItem;
+    var requestProtocol = req.protocol;
 
     try {
 
@@ -180,7 +181,7 @@ function handleQuery(req, res) {
                 if(api_key) {
                     ApiKeyAuth.verifyRequest(req, this);
                 } else {
-                    oAuth.verifyRequest(req, this);
+                    oAuth.verifyRequest(req, this, requestProtocol);
                 }
             },
             function queryExplain(err, data){
diff --git a/app/models/oauth.js b/app/models/oauth.js
index 2210fae4..a87c9f89 100644
--- a/app/models/oauth.js
+++ b/app/models/oauth.js
@@ -66,7 +66,7 @@ var oAuth = function(){
   me.verifyRequest = function(req, callback){
     var that = this;
     //TODO: review this
-    var http = arguments['2'];
+    var httpProto = arguments['2'];
     var passed_tokens;
     var ohash;
     var signature;
@@ -99,7 +99,16 @@ var oAuth = function(){
 
         var method = req.method;
         var host   = req.headers.host;
-        var path   = http ? 'http://' + host + req.route.path : 'https://' + host + req.route.path;
+
+        if(!httpProto || (httpProto != 'http' && httpProto != 'https')) {
+          var msg = "Unknown HTTP protocol.";
+          err = new Error(msg);
+          err.http_status = 500;
+          callback(err);
+          return;
+        }
+        
+        var path   = httpProto + '://' + host + req.route.path;
         that.splitParams(req.query);
 
         // remove signature from passed_tokens