Fix sqlapi request header to be "Host", not "Hostname"

Closes (better) #117 -- automated test included

lib/cartodb/server_options.js

@@ -95,7 +95,7 @@ module.exports = function(){
       //
       request.post({
           url:sqlapi, body:qs, json:true,
-          headers:{hostname:sqlapihostname}
+          headers:{host: sqlapihostname}
         }, function(err, res, body)
       {
           if (err){

test/acceptance/server.js

@@ -1126,6 +1126,37 @@ suite('server', function() {
         );
     });
 
+    test("passes hostname header to sqlapi", function(done){
+        var qo = {
+          sql: "SELECT * from gadm4",
+          map_key: 1234
+        };
+        var sqlapi;
+        Step(
+          function sendRequest(err) {
+            var next = this;
+            assert.response(server, {
+                headers: {host: 'localhost'},
+                url: '/tiles/gadm4/6/31/24.png?' + querystring.stringify(qo),
+                method: 'GET'
+            },{}, function(res) { next(null, res); });
+          },
+          function checkResponse(err, res) {
+            if ( err ) throw err;
+            assert.equal(res.statusCode, 200, res.statusCode + ': ' + res.body);
+            var last_request = sqlapi_server.getLastRequest();
+            assert.ok(last_request);
+            var host = last_request.headers['host'];
+            assert.ok(host);
+            assert.equal(host, 'localhost.donot_look_this_up');
+            return null;
+          },
+          function finish(err) {
+            done(err);
+          }
+        );
+    });
+
     test("requests to skip cache on sqlapi error", function(done){
         var qo = {
           sql: "SELECT g.cartodb_id, g.codineprov, t.the_geom_webmercator "

test/support/SQLAPIEmu.js

@@ -6,10 +6,14 @@ var o = function(port, cb) {
 
   this.queries = [];
   var that = this;
+  this.requests = [];
 
   this.sqlapi_server = http.createServer(function(req,res) {
       //console.log("server got request with method " + req.method);
       var query;
+
+      that.requests.push(req);
+
       if ( req.method == 'GET' ) {
         query = url.parse(req.url, true).query;
         that.handleQuery(query, res);
@@ -68,5 +72,9 @@ o.prototype.close = function(cb) {
   this.sqlapi_server.close(cb);
 };
 
+o.prototype.getLastRequest = function() {
+  return this.requests.pop();
+};
+
 module.exports = o;