[nginx] Adding Support for Weak ETags

[Aaron Peschel]

Hello,

I am interested in getting support for Weak ETags into the mainline.
There was some discussion previously in here previously that developed
a quick patch to add support. What additional functionality would be
required and what steps should be followed to get weak etag
functionality added to nginx? I am willing to do the work, I just need
some help with heading in the right direction.

Thank you,

-Aaron Peschel