some questions to mod_rewrite

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Hi,

i just setup a Nextcloud instance in conjunction with OnlyOffice.
NC makes heavy use of mod_rewrite and i try to understand it.
mod_rewrite isn't easy, so i have some questions and hope for help:

1. Is a RewriteCond just valid for the consequent rule or for all consequent rules ?
2. Example: "RewriteRule ^core/js/oc.js$ index.php [PT,E=PATH_INFO:$1]"
   Are Backreferences also in flags possible ?
   What is the content of $1 ? I thought backreferences belong to parts of the pattern which are in parentheses ?
   There are no parentheses.
3. Example: RewriteCond %{REQUEST_FILENAME} !\.(css|js|svg|gif|png|html|ttf|woff2?|ico|jpg|jpeg|map|webm|mp4|mp3|ogg|wav)$
   The ! (exclamation mark) stands for a negotiation. Does that mean this condition is only fullfilled if the file does NOT have an extension
   like .css, .js ... ?
4. Example: RewriteRule .* - [env=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
   What does this rule do ?
   All requests (.*) aren't substituted (-). But ... an environment variable HTTP_AUTHORIZATION is set to ... ?
   What means %{HTTP:Authorization} ? Is that also a kind of a backreference ?

More questions will follow :-))


Thanks.


Bernd

-- 

Bernd Lentes 
Head of Systemadministration 
Institute for Metabolism and Cell Death (MCD) 
Building 25 - office 122 
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bernd.lentes@xxxxxxxxxxxxxxxxxxxxx 
phone: +49 89 3187 1241 
phone: +49 89 3187 3827 
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http://www.helmholtz-muenchen.de/mcd
Helmholtz Zentrum München

Helmholtz Zentrum Muenchen
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85764 Neuherberg
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