Cannot get WebDAV work under Nginx Reverse Proxy

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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:

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Or for longer, use three backticks above and below the code snippet:

longer
example
here

Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can :heart:

Nextcloud version (eg, 20.0.5): 24.0.3
Operating system and version (eg, Ubuntu 20.04): TrueNAS 12.0U8.1 Jail 12.2-RELEASE-p9
Apache or nginx version (eg, Apache 2.4.25): nginx/1.20.1 (Both Proxy / Nextcloud)
PHP version (eg, 7.4): 8.0

The issue you are facing:
I cannot connect to WebDAV using Reverse Proxy Domain, but I can connect to WebDAV using Server Address.

Both Proxy and Nextcloud are using https to Host

Is this the first time you’ve seen this error? (Y/N): Y

Steps to replicate it:

  1. Install Nextcloud
  2. Edit Config
  3. Connect to WebDAV via Proxy Domain

The output of your Nextcloud log in Admin > Logging:

No Log Related

The output of your config.php file in /usr/local/www/nextcloud (make sure you remove any identifiable information!):

<?php
$CONFIG = array (
  'instanceid' => '',
  'passwordsalt' => '',
  'secret' => '',
  'trusted_domains' =>
  array (
    1 => 'proxy_public_domain',
  ),
  'datadirectory' => '/mnt/data',
  'dbtype' => 'mysql',
  'version' => '24.0.3.2',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost:/tmp/mysql.sock',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'nextcloud_admin',
  'dbpassword' => '',
  'installed' => true,
  'redis' =>
  array (
    'host' => '/var/run/redis/redis.sock',
    'port' => 0,
  ),
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'default_phone_region' => 'HK',
  'logfile' => '/usr/local/www/nextcloud/config/log/nextcloud.log',
  'loglevel' => 4,
  'enable_previews' => false,
  'overwrite.cli.url' => 'https://proxy.domain',
  'trusted_proxies' =>
  array (
    0 => 'proxy_local_domain',
  ),
  'overwritehost' => 'proxy_public_domain',
  'overwriteprotocol' => 'https',
  'updater.secret' => '',
  'maintenance' => false,
  'theme' => '',
);

The output of your Apache/nginx/system log in /var/log/____:

2022/08/06 17:28:25 [error] 66577#100453: *638 upstream prematurely closed connection while reading response header from upstream, client: 192.168.60.20, server: eecloud.zero-0.xyz, request: "OPTIONS /remote.php/dav/files/USERNAME/ HTTP/1.1", upstream: "https://Nextcloud_Local_IP:443/remote.php/dav/files/USERNAME/", host: "proxy_public_domain"

PASTE HERE


Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.

PASTE HERE