Merge pull request #7259 from takluyver/kernelspec-head-error

Fix HEAD requests for kernelspec resources

IPython/html/kernelspecs/handlers.py

@@ -1,27 +1,27 b''
 from tornado import web
 from ..base.handlers import IPythonHandler
 from ..services.kernelspecs.handlers import kernel_name_regex
 
 class KernelSpecResourceHandler(web.StaticFileHandler, IPythonHandler):
     SUPPORTED_METHODS = ('GET', 'HEAD')
 
     def initialize(self):
         web.StaticFileHandler.initialize(self, path='')
 
     @web.authenticated
     def get(self, kernel_name, path, include_body=True):
         ksm = self.kernel_spec_manager
         try:
             self.root = ksm.get_kernel_spec(kernel_name).resource_dir
         except KeyError:
             raise web.HTTPError(404, u'Kernel spec %s not found' % kernel_name)
         self.log.debug("Serving kernel resource from: %s", self.root)
         return web.StaticFileHandler.get(self, path, include_body=include_body)
 
     @web.authenticated
     def head(self, kernel_name, path):
-        self.get(kernel_name, path, include_body=False)
+        return self.get(kernel_name, path, include_body=False)
 
 default_handlers = [
     (r"/kernelspecs/%s/(?P<path>.*)" % kernel_name_regex, KernelSpecResourceHandler),
 ]
  No newline at end of file