While the origins of
SSI seem old and obscure (that cached page from 95 from University of Illinois seems to be the reference, apparently it's from the
NCSA httpd webserver which used to power about 95% of the net), that of
ESI seem more recent and rejoicing (w3 specifications from 2001, written mostly by guys from Akamai).
Also, I keep hearing about
ESI and I'm wondering whether that should therefore be the way to go. However I already have a setup in place with
nginx, which only supports
SSI, and would like to follow the
KISS principle and avoid using
Varnish if at all possible.
For my immediate use case, which will be to include a dynamic user bar at the top of each pages, I believe
SSI will do the job. However I'm concerned that as my website grows, I will need features only supported by
ESI which will force me to re-design everything, which brings me to my question (finally the reader says):
What are the main features not supported by
SSI that would make you choose
ESI (and vice versa) ?