nginx可以解决这个问题

nginx 添加伪静态：
我的nextcloud安装在网站的二级目录下：
rewrite /.well-known/carddav /nextcloud/remote.php/dav permanent;
rewrite /.well-known/caldav /nextcloud/remote.php/dav permanent;
如果根目录就是nextcloud:
rewrite /.well-known/carddav /remote.php/dav permanent;
rewrite /.well-known/caldav /remote.php/dav permanent;

官方说明：https://docs.nextcloud.com/server/23/admin_manual/issues/general_troubleshooting.html#service-discovery-label
我的是Debian，apahce2。apache2欢迎页没有动过，nextcloud按官方文档放在/var/www/nextcloud目录下。长话短说。
打开/etc/apache2/sites-available/000-default.conf
如果原来代码长这样：
<VirtualHost *:80>
# The ServerName directive sets the request scheme, hostname and port that
# the server uses to identify itself. This is used when creating
# redirection URLs. In the context of virtual hosts, the ServerName
# specifies what hostname must appear in the request's Host: header to
# match this virtual host. For the default virtual host (this file) this
# value is not decisive as it is used as a last resort host regardless.
# However, you must set it for any further virtual host explicitly.
#ServerName http://www.example.com
ServerAdmin webmaster@localhost
DocumentRoot /var/www/html
# Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
# error, crit, alert, emerg.
# It is also possible to configure the loglevel for particular
# modules, e.g.
#LogLevel info ssl:warn
ErrorLog ${APACHE_LOG_DIR}/error.log
CustomLog ${APACHE_LOG_DIR}/access.log combined
# For most configuration files from conf-available/, which are
# enabled or disabled at a global level, it is possible to
# include a line for only one particular virtual host. For example the
# following line enables the CGI configuration for this host only
# after it has been globally disabled with "a2disconf".
#Include conf-available/serve-cgi-bin.conf
</VirtualHost>
# vim: syntax=apache ts=4 sw=4 sts=4 sr noet
则添加如下代码：
<Directory /var/www/html>
AllowOverride All
</Directory>
在/var/www/html下添加.htaccess文件，添加如下代码：
<IfModule mod_rewrite.c>
RewriteEngine on RewriteRule ^\.well-known/carddav /nextcloud/remote.php/dav [R=301,L]
RewriteRule ^\.well-known/caldav /nextcloud/remote.php/dav [R=301,L]
RewriteRule ^\.well-known/webfinger /nextcloud/index.php/.well-known/webfinger [R=301,L]
RewriteRule ^\.well-known/nodeinfo /nextcloud/index.php/.well-known/nodeinfo [R=301,L]
</IfModule>
听懂掌声。

#编辑Nextcloud的配置目录：config/nginx/site-confs/default文件，
添加下面命令行： # yourdomian.com 要填你的域名
location = /.well-known/carddav { return 301 https://yourdomian.com/remote.php/dav;}
location = /.well-known/caldav { return 301 https://yourdomian.com/remote.php/dav/;}
location = /.well-known/webfinger { return 301 https://yourdomian.com/index.php/.well-known/webfinger;} location = /.well-known/nodeinfo { return 301 https://yourdomian.com/index.php/.well-known/nodeinfo;}
#注销掉下面的两个实例