Reverse Proxy not working

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Nextcloud version (eg, 12.0.2): 17.0.2.1
Operating system and version (eg, Ubuntu 17.04): Debian Buster
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.38 (Debian)
PHP version (eg, 7.1): PHP 7.3.11-1~deb10u1 (cli)

The issue you are facing: Site won’t load through reverse proxy in subdirectory

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

Steps to replicate it:

  1. add /nextcloud location in existing reverse proxy
  2. attempt to load domain.net/nextcloud.index.php
  3. get error screen

The output of your Nextcloud log in Admin > Logging:
No errors logged in last 2 days.

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

{
    "instanceid": "***REMOVED SENSITIVE VALUE***",
    "passwordsalt": "***REMOVED SENSITIVE VALUE***",
    "secret": "***REMOVED SENSITIVE VALUE***",
    "trusted_domains": [
        "cloud.odinforce.net",
        "odinforce.net",
        "hecate"
    ],
    "onlyoffice": {
        "verify_peer_off": true
    },
    "datadirectory": "***REMOVED SENSITIVE VALUE***",
    "overwritewebroot": "\/nextcloud",
    "dbtype": "mysql",
    "version": "17.0.2.1",
    "overwrite.cli.url": "https:\/\/cloud.odinforce.net\/nextcloud",
    "dbname": "***REMOVED SENSITIVE VALUE***",
    "dbhost": "***REMOVED SENSITIVE VALUE***",
    "dbport": "",
    "dbtableprefix": "oc_",
    "mysql.utf8mb4": true,
    "dbuser": "***REMOVED SENSITIVE VALUE***",
    "dbpassword": "***REMOVED SENSITIVE VALUE***",
    "installed": true,
    "mail_smtpmode": "smtp",
    "mail_smtpsecure": "tls",
    "mail_sendmailmode": "smtp",
    "mail_smtpauthtype": "PLAIN",
    "mail_smtpauth": 1,
    "mail_from_address": "***REMOVED SENSITIVE VALUE***",
    "mail_domain": "***REMOVED SENSITIVE VALUE***",
    "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
    "mail_smtpport": "587",
    "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
    "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
    "maintenance": false,
    "memcache.local": "\\OC\\Memcache\\APCu"
}

Here’s logs from the actual attempting to load https://domain.net/nextcloud/index.php
everything works fine if I use cloud.domain.net/nextcloud.index.php
The output of your Apache/nginx/system log in /var/log/____:
https://pastebin.com/q2wqfv9F
Also, heres my nginx logs. Lots of 400s
https://pastebin.com/diqKT0Gx