Improvements to file uploaded, mime types and .py reader.

* The .py notebook reader now uses that ast module to split
  a plain python file into blocks. These blocks become cells in
  the notebook.
* Proper mime types are used for xml (application/xml), json
  (application/json) and python (application/x-python).
* Other fixes to file uploading.

IPython/frontend/html/notebook/handlers.py

@@ -41,12 +41,12 @@ class NamedNotebookHandler(web.RequestHandler):
 class KernelHandler(web.RequestHandler):
 
     def get(self):
-        self.write(json.dumps(self.application.kernel_ids))
+        self.finish(json.dumps(self.application.kernel_ids))
 
     def post(self):
         kernel_id = self.application.start_kernel()
         self.set_header('Location', '/'+kernel_id)
-        self.write(json.dumps(kernel_id))
+        self.finish(json.dumps(kernel_id))
 
 
 class KernelActionHandler(web.RequestHandler):
@@ -58,6 +58,7 @@ class KernelActionHandler(web.RequestHandler):
         if action == 'restart':
             new_kernel_id = self.application.restart_kernel(kernel_id)
             self.write(json.dumps(new_kernel_id))
+        self.finish()
 
 
 class ZMQStreamHandler(websocket.WebSocketHandler):
@@ -83,7 +84,7 @@ class NotebookRootHandler(web.RequestHandler):
     def get(self):
         nbm = self.application.notebook_manager
         files = nbm.list_notebooks()
-        self.write(json.dumps(files))
+        self.finish(json.dumps(files))
 
     def post(self):
         nbm = self.application.notebook_manager
@@ -95,7 +96,7 @@ class NotebookRootHandler(web.RequestHandler):
         else:
             notebook_id = nbm.new_notebook()
         self.set_header('Location', '/'+notebook_id)
-        self.write(json.dumps(notebook_id))
+        self.finish(json.dumps(notebook_id))
 
 
 class NotebookHandler(web.RequestHandler):
@@ -110,10 +111,10 @@ class NotebookHandler(web.RequestHandler):
             self.set_header('Content-Type', 'application/json')
             self.set_header('Content-Disposition','attachment; filename=%s.json' % name)
         elif format == u'xml':
-            self.set_header('Content-Type', 'text/xml')
+            self.set_header('Content-Type', 'application/xml')
             self.set_header('Content-Disposition','attachment; filename=%s.ipynb' % name)
         elif format == u'py':
-            self.set_header('Content-Type', 'text/plain')
+            self.set_header('Content-Type', 'application/x-python')
             self.set_header('Content-Disposition','attachment; filename=%s.py' % name)
         self.set_header('Last-Modified', last_mod)
         self.finish(data)

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

@@ -559,11 +559,12 @@ var IPython = (function (IPython) {
             data.id = notebook_id
             // We do the call with settings so we can set cache to false.
             var settings = {
-              processData : false,
-              cache : false,
-              type : "PUT",
-              data : JSON.stringify(data),
-              success : $.proxy(this.notebook_saved,this)
+                processData : false,
+                cache : false,
+                type : "PUT",
+                data : JSON.stringify(data),
+                headers : {'Content-Type': 'application/json'},
+                success : $.proxy(this.notebook_saved,this)
             };
             IPython.save_widget.status_saving();
             $.ajax("/notebooks/" + notebook_id, settings);

IPython/frontend/html/notebook/static/js/notebooklist.js

@@ -191,12 +191,21 @@ var IPython = (function (IPython) {
                 var nbname = item.find('.item_name > input').attr('value');
                 var nbformat = item.data('nbformat');
                 var nbdata = item.data('nbdata');
+                var content_type = 'text/plain';
+                if (nbformat === 'xml') {
+                    content_type = 'application/xml';
+                } else if (nbformat === 'json') {
+                    content_type = 'application/json';
+                } else if (nbformat === 'py') {
+                    content_type = 'application/x-python';
+                };
                 var settings = {
                     processData : false,
                     cache : false,
-                    type : "POST",
-                    dataType : "json",
+                    type : 'POST',
+                    dataType : 'json',
                     data : nbdata,
+                    headers : {'Content-Type': content_type},
                     success : function (data, status, xhr) {
                         that.add_link(data, nbname, item);
                         that.add_delete_button(item);
@@ -204,7 +213,7 @@ var IPython = (function (IPython) {
                 };
 
                 var qs = $.param({name:nbname, format:nbformat});
-                $.ajax("/notebooks?" + qs, settings);
+                $.ajax('/notebooks?' + qs, settings);
             });
         var cancel_button = $('<button>Cancel</button>').button().
             click(function (e) {