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Reply to topic   Topic: Apache Reverse Proxy help

Joined: 04 Jun 2021
Posts: 1
Location: Germany

PostPosted: Fri 04 Jun '21 11:43    Post subject: Apache Reverse Proxy help Reply with quote

Hey I am here because I was hoping someone could help me with my reverse Proxy.

In my Nextcloud instance I get a warning and I couldn't remove it, so I opened a thread with exact details:

nursoda spotted that
curl -kI https://YOURSERVERNAME/.well-known/carddav

should return location: https:// but for me it returns location: http:/

This is in my .htaccess file which I thought would take care of the issue but apparently doesn't:
<IfModule mod_rewrite.c>
  RewriteEngine on
  RewriteCond %{HTTP_USER_AGENT} DavClnt
  RewriteRule ^$ /remote.php/webdav/ [L,R=302]
  RewriteRule .* - [env=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
  RewriteRule ^\.well-known/carddav /remote.php/dav/ [R=301,L]
  RewriteRule ^\.well-known/caldav /remote.php/dav/ [R=301,L]
  RewriteRule ^remote/(.*) remote.php [QSA,L]
  RewriteRule ^(?:build|tests|config|lib|3rdparty|templates)/.* - [R=404,L]
  RewriteRule ^\.well-known/(?!acme-challenge|pki-validation) /index.php [QSA,L]
  RewriteRule ^(?:\.(?!well-known)|autotest|occ|issue|indie|db_|console).* - [R=404,L]

I still think that's a reverse Proxy issue. Am I correct? How can I fix that, does anyone know?

Thanks in advance!
Cheers Simon
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Joined: 16 Aug 2020
Posts: 108
Location: UK

PostPosted: Fri 04 Jun '21 21:30    Post subject: Reply with quote

Your various rewrite rules are site relative, so if the location result seen by the browser is http:// rather than https://, you need to determine where in the response this http:// prefix is coming from. Suggest you use developer mode on your browser (shift+control+i with Firefox or Chrome) to confirm where.

Chances are these erroneous redirects are being passed back in the response body from your non-secure proxied site, rather than location headers.

If it is in the response body, you may be able to use mod_substitute or mod_proxy_html to rewrite the proxied non-secure responses to https://

Also, I'd question using 301 redirects versus 302. The 301's are permanent, and so browsers cache this decision rather than checking the server. Hence, if you ever want to change your target, you'll find clients ignore you, until such time as the client cache is cleared.
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