caldav | caldav operations in b2g calendar app

I am trying to send yahoo calendars(caldav) a request to get "current-user-principal" But In response I am getting "401 Unauthorized" error. Before this request I am making another request to get "OPTIONS" which is giving "200 OK" response.

Request call is

I want to delete an Event of my Nextcloud calendar using CalDAV. But when I try to delete an object, I get an error.

This is my code:

I have a self-hosted CalDav calendar (DaviCal). Also, I have a Spring application, and I want to manage this calendar from my application (e.g. create events, users, scheduling). I have found a CalDAV library - iCal4j, but I cannot find any good documentation on how to use it. I need at least to connect to my calendar server. How to do it? Thanks in advance!

(p.s. I know, that there is another library - caldav4j but it seems to me that it has no more supported.)

I have an iCalendar event in my Sabre:

I'm working on a little project where I would like to fully sync my Apple Calendar with my web-app. I'm using two packages in python (caldav and icalendar) to view, create, update and delete events and then I'm using some GraphQL to prettify the data to my frontend. It's working quite nicely at the moment, but if I ever were to push this to production, there is one big problem. In the caldav-package, you need to supply a link to the client. It looks something like this:

If creating an Event via the nextcloud Ui, the Caldav server response looks like this (output shortened):

Let me preface this by saying most of my "experience" comes from blindly copypasting config lines from various blogs and sites like this and hoping for the best.

Currently I have a setup like this:

Dynamic ddns hostname pointed at my public IP redirecting incoming traffic from ports 80 and 443 to a LXC container with nextcloud + certificate from letsencrypt for the same ddns hostname. So far so good.

this is the relevant nginx config:

There are numerous posts about this issue but none that solve my problem.

I am using jwilder/nginx-proxy as a reverse proxy and jrcs/letsencrypt-nginx-proxy-companion to generate certificates.

For some reason at some point the certification process stopped working. This appears to be because /.well-known/acme-challenge/somefilename is returning a 404.

As far as I can see this config:

Possibly nothing evokes so much scorn as questions on this issue, but I am really at a loss:

I have 2 IP addresses, the main one, 77.68.123.127, is to point to the default VirtualHost, 000-default == www.oneasl.com, and the second, 77.68.122.124, to davical == cal.oneasl.com. The 2 conf files are appended, then the output of 'root@asl1:/etc/php/7.2/apache2# apache2ctl -S'

php is working at 77.68.123.127/davical

77.68.123.127 in the browser takes me to the apache2 welcome page 77.68.123.127/davical takes me to the davical login 77.68.123.127:8080 takes me to tomcat8

so far so good

however 77.68.122.124 should == 77.68.123.127/davical == cal.oneasl.com, but it doesn't load anything...?

Many thanks and sorry if I have overlooked something obvious. Sorry too for the gratuitous use of code markup but I couldn't post without it!

000-default.conf;