For gnome-shell version 3.6, we still need Soup.SeesionAsync with explicitely set ProxResolver .

src/extension.js

@@ -122,7 +122,9 @@ const WEATHER_CONV_MPS_IN_KPH = 3.6;
 const WEATHER_CONV_MPS_IN_KNOTS = 1.94384449;
 const WEATHER_CONV_MPS_IN_FPS = 3.2808399;
 
-const _httpSession = new Soup.Session();
+// Soup session (see https://bugzilla.gnome.org/show_bug.cgi?id=661323#c64) (Simon Legner)
+const _httpSession = new Soup.SessionAsync();
+Soup.Session.prototype.add_feature.call(_httpSession, new Soup.ProxyResolverDefault());
 
 const WeatherMenuButton = new Lang.Class({
     Name: 'WeatherMenuButton',

src/prefs.js

@@ -65,7 +65,9 @@ const WEATHER_URL_BASE = 'http://api.openweathermap.org/data/2.5/';
 const WEATHER_URL_CURRENT = WEATHER_URL_BASE + 'weather';
 const WEATHER_URL_FIND = WEATHER_URL_BASE + 'find';
 
-const _httpSession = new Soup.Session();
+// Soup session (see https://bugzilla.gnome.org/show_bug.cgi?id=661323#c64) (Simon Legner)
+const _httpSession = new Soup.SessionAsync();
+Soup.Session.prototype.add_feature.call(_httpSession, new Soup.ProxyResolverDefault());
 
 let mCities = null;