#9 — Encoding error when rsvpable interface is active on IE and webkit browsers

In IE6, IE7, and WebKit-based browsers, activating the rsvpable interface triggers an encoding error when rendering the page:

Traceback (innermost last):
  Module ZPublisher.Publish, line 122, in publish
  Module ZServer.HTTPResponse, line 262, in setBody
  Module ZPublisher.HTTPResponse, line 324, in setBody
  Module ZPublisher.HTTPResponse, line 476, in _encode_unicode
UnicodeEncodeError: 'latin-1' codec can't encode character u'\u201c' in position 31294: ordinal not in range(256)

It's possible that this only occurs if the activated object is the default view object for its container, but this is unconfirmed.

A possible fix/workaround is to set the encoding in the render() method of the rsvp form viewlet class:

self.request.response.setHeader('content-type',"text/html; charset=utf-8")