I'd like to propose that URI encoding be done using upper case
characters instead of lower case characters. Both seem to be acceptable;
I'm only requesting this since most of the other libraries that we use
that do URI encoding use upper case characters.

nginx 0.7.6 src/core/ngx_string.c

diff ngx_string.c~ ngx_string.c
1096c1096
< static u_char hex[] = "0123456789abcdef";
---
> static u_char hex[] = "0123456789ABCDEF";