Internationalization and cache

Description

Using Plone translation facilities in the presence of caching.

Introduction

You need to have the following monkey-patch in place if you intend to use LinguaPlone (translated content) with front-end caching servers. Otherwise CSS, JS and media files will have a language cookie set on them, preventing cache from working.

Note

This is a well-known Plone issue.

Example:

from ZPublisher.HTTPRequest import HTTPRequest

LanguageTool._old___call__ = LanguageTool.__call__

def LanguageTool__call__(self, container, req):
    """The __before_publishing_traverse__ hook.

    Patched to *not* set the language cookie, as this breaks the site model.

    """
    self._old___call__(container, req)
    if not isinstance(req, HTTPRequest):
        return None
    response = req.response
    if 'I18N_LANGUAGE' in response.cookies:
        if 'set_language' in req.form:
            return None
        del response.cookies['I18N_LANGUAGE']

LanguageTool.__call__ = LanguageTool__call__

More info

• http://stackoverflow.com/questions/5715216/why-plone-3-sets-language-cookie-to-css-js-registry-files-and-how-to-get-rid-of