--- a/runtime/NevowServer.py	Wed Oct 11 13:55:56 2017 +0300
+++ b/runtime/NevowServer.py	Thu Oct 12 16:18:05 2017 +0300
@@ -157,7 +157,7 @@
         """
         Force content type to fit with SVG
         """
-        req = inevow.IRequest(ctx)
+        req = ctx.locate(inevow.IRequest)
         req.setHeader('Content-type', 'application/xhtml+xml')
         return super(WebInterface, self).renderHTTP(ctx)