On Fri, Dec 11, 2020 at 10:06 AM Lentes, Bernd
<bernd.len...@helmholtz-muenchen.de> wrote:
>
> ----- On Dec 9, 2020, at 6:02 PM, Eric Covener cove...@gmail.com wrote:
>
> Hi Eric,
>
> thanks for your answer.
> Now i'm struggling with RewriteRule
> ^(?:build|tests|config|lib|3rdparty|templates)/.* - [R=404,L]
>
> Most is clear. The content of the parentheses () like build, tests .. is
> or-conjuncted by the pipe |,
> so only one of the patterns must appear.
> But what is ?: ?
It makes the () "non-capturing" meaning if you had other () sequences
this or-conjunction would not eat up $1.
In the case above it is unnecessary since there is no other capture.
> The question mark normally is a repeater for the prior character. But there
> is no one.
> And wherefore is the colon ?
It's a special case when following "(". It allows the
matching/capturing to be customized a few different ways (man
pcresyntax has a concise list of the flags that follow "(?")
> I gave https://perldoc.perl.org/perlre#Metacharacters a chance. It seems the
> ?: says that a match for (build|tests|config|lib|3rdparty|templates)
> can't be used as a backreference. Right ? Where is the purpose of that ?
yes, just to avoid eating up $1. But some people do it out of habit
when they use () just to group "|".
> in my error_log with setting "LogLevel info rewrite:trace2":
> [Fri Dec 11 15:44:50.666869 2020] [rewrite:trace1] [pid 3408]
> mod_rewrite.c(483): [client 146.107.126.166:57329] 146.107.126.166 - -
> [nc-mcd.helmholtz-muenchen.de/sid#7f9158e4f700][rid#7f9155a2a0a0/initial]
> [perdir /var/www/nextcloud/] pass through /var/www/nextcloud/
>
> What is sid and rid ?
server (vhost) id and request id i believe. Usually not so useful.
The /initial meant it's not a "subrequest" (a way apache modules
sometimes make an internal request related to the real request to
probe for things)
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