Going green: support special numeric values for json responses

lib/cartodb/server.js

@@ -310,6 +310,25 @@ function bootstrap(opts) {
     app.enable('jsonp callback');
     app.disable('x-powered-by');
     app.disable('etag');
+
+    // Fix: https://github.com/CartoDB/Windshaft-cartodb/issues/705
+    // See: http://expressjs.com/en/4x/api.html#app.set
+    app.set('json replacer', function (key, value) {
+        if (value !== value) {
+            return 'NaN';
+        }
+
+        if (value === Infinity) {
+            return 'Infinity';
+        }
+
+        if (value === -Infinity) {
+            return '-Infinity';
+        }
+
+        return value;
+    });
+
     app.use(bodyParser.json());
 
     app.use(function bootstrap$prepareRequestResponse(req, res, next) {