web: common initalizer for dynamic handlers
web: common initalizer for dynamic handlers

All dynamic handlers will have set headers to turn off
caching. Rather than repeating that code in the handlers,
do it in the initialize method of the base handler.

Signed-off-by: Ilija Hadzic <47a09d4a4430975766160361f65fc72633be50b6@gmail.com>

ihadzic/jim,ihadzic/jim,ihadzic/jim