web_serverD1223919939Astevie#The Plan 9 web server httpd(8) has some interesting features. It#also kept me scratching my head all day getting it going so I#thought I'd share a few things.##When the httpd runs it sets itself to user "none" and runs newns(2)#and then addns(2) using the namespace provided on the command line#(or /lib/namespace.httpd if you didn't give it a -n). This means#that whatever you supply for the namespace file has to exist in the#new namespace. ip/httpd/httpd -n /cfg/$sysname/namespace.httpd was#my solution.##While experimenting I had the problem of how to kill a process owned#by none, here's how to do it :##! p = `{ps | grep httpd}#! chmod 777 /proc/$p(2) ^/note && echo kill > /proc/$p(2) ^/note##I'm assuming only one program called httpd is running, of course.##For extra fun ip/httpd/mirror was missing from my distribution (Sept#07) and I didn't notice for ages.##momo here is a Unix box running u9fs -a none and I'm using a#terminal to play on so termrc it is##cat /cfg/$sysname/termrc##! fn start_httpd {#! 	rfork#! 	bind /n/momo/home/plan9/httpd /usr#! 	bind /usr/httpd.rewrite /sys/lib/httpd.rewrite#! 	ip/httpd/httpd -n /cfg/$sysname/namespace.httpd#! }#! #! 9fs momo#! #! start_httpd &##The folder /n/momo/home/plan9/httpd has in it :##! bin/#! web/#! httpd.rewrite##cat /cfg/$sysname/namespace.httpd##! mount /srv/momo /n/momo#! bind /n/momo/home/plan9/httpd/bin /bin/ip/httpd##So now my /magic/ files are kept on momo so I don't pollute#/bin/ip/httpd##I also found a bug with vhosts and submitted a patch(1)#httpd-post-port because vhosts running on non-default port were#impossible as the :port was being stripped when the vhosts were#parsed but not when matching http requests. Leaving the :port on is#the correct behaviour according to RFC 2616 14.23.#