pass ws_url to kernel constructor

via session constructor via notebook constructor…

IPython/html/static/notebook/js/notebook.js

@@ -59,6 +59,7 b' define(['
         this.keyboard_manager = options.keyboard_manager;
         this.save_widget = options.save_widget;
         this.tooltip = new tooltip.Tooltip(this.events);
+        this.ws_url = options.ws_url;
         // default_kernel_name is a temporary measure while we implement proper
         // kernel selection and delayed start. Do not rely on it.
         this.default_kernel_name = 'python';
@@ -1496,6 +1497,7 b' define(['
     Notebook.prototype.start_session = function () {
         this.session = new session.Session({
             base_url: this.base_url,
+            ws_url: this.ws_url,
             notebook_path: this.notebook_path,
             notebook_name: this.notebook_name,
             // For now, create all sessions with the 'python' kernel, which is the

IPython/html/static/services/kernels/js/kernel.js

@@ -15,7 +15,7 b' define(['
      * A Kernel Class to communicate with the Python kernel
      * @Class Kernel
      */
-    var Kernel = function (kernel_service_url, notebook, name) {
+    var Kernel = function (kernel_service_url, ws_url, notebook, name) {
         this.events = notebook.events;
         this.kernel_id = null;
         this.shell_channel = null;
@@ -23,7 +23,7 b' define(['
         this.stdin_channel = null;
         this.kernel_service_url = kernel_service_url;
         this.name = name;
-        this.ws_url = IPython.utils.get_body_data("wsUrl");
+        this.ws_url = ws_url || IPython.utils.get_body_data("wsUrl");
         if (!this.ws_url) {
             // trailing 's' in https will become wss for secure web sockets
             this.ws_url = location.protocol.replace('http', 'ws') + "//" + location.host;

IPython/html/static/services/sessions/js/session.js

@@ -17,6 +17,7 b' define(['
         this.path = options.notebook_path;
         this.kernel_name = options.kernel_name;
         this.base_url = options.base_url;
+        this.ws_url = options.ws_url;
     };
     
     Session.prototype.start = function(callback) {
@@ -91,7 +92,7 b' define(['
     Session.prototype._handle_start_success = function (data, status, xhr) {
         this.id = data.id;
         var kernel_service_url = utils.url_path_join(this.base_url, "api/kernels");
-        this.kernel = new kernel.Kernel(kernel_service_url, this.notebook, this.kernel_name);
+        this.kernel = new kernel.Kernel(kernel_service_url, this.ws_url, this.notebook, this.kernel_name);
         this.kernel._kernel_started(data.kernel);
     };