Rewrite to different path if file doesn't exist

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1

I’ve got some document root which gets listed by the browse directive, now I want to rewrite it to a different root path(from /var/www/app to /var/www/legacy) if a requested file doesn’t exist, but it always results in a 404.

Have somebody already done something like that? Got somebody an idea how to solve that?

I also tried to move the other folder into the document root and hide it with the internal directive, but rewrite to it also results in 404.

Thanks in advance.

2

Timely question, I am currently tackling this design problem for Caddy 2 today.

I’m not sure if it’s possible in Caddy 1, or at least, not obvious; what have you tried?

3

So far I have tried it with an approach similar to this, without the success. Would it be possible to fall back with a rewrite to legacy if the file doesn’t exist within current with a custom plugin/directive?

mkdir -p current legacy

echo "Foo" >| current/foo.txt
echo "Bar" >| legacy/bar.txt

cat << EOF >| Caddyfile
:8080/legacy {
  root legacy
  browse
  log / stdout
  errors stderr
}

:8080 {
  root current
  browse
  log / stdout
  errors stderr

  rewrite {path} {path}/ /legacy/{path}

  redir {
    if {uri} not {rewrite_uri}
    / {rewrite_uri}
  }
}
EOF
4

Consider instead setting your root to a common containing folder, in this case presumably /var/www, and rewriting to content in each as appropriate.

:8080 {
  root /var/www
  browse
  log stdout
  errors stderr

  rewrite {
    to /current{path} /current{path}/ /legacy{path} /legacy{path}/
  }
}

Effectively this results in “try files and folders in ./current, then try files and folders in ./legacy, then 404 out”.

It’s worth cautioning regarding the use of /var/www as the root - if you don’t explicitly rewrite every single request into the subfolder you want, someone could traverse to other folders in there. But as long as you’re careful, this will work.

3 Likes
5

Thanks, a great idea. This seem to work fine so far.

6

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