get_vary_cache_on

EquationPlugin.get_vary_cache_on(request, instance, placeholder)

Provides hints to the placeholder, and in turn to the page for determining VARY headers for the response.

Must return one of:

• None (default),

• String of a case-sensitive header name, or

• iterable of case-sensitive header names.

NOTE: This only makes sense to use with caching. If this plugin has cache = False or plugin.get_cache_expiration(…) returns 0, get_vary_cache_on() will have no effect.