Error messages while open an local calendar

[Sailor-Fhem]

Dear all

Could you please try to reproduce some failures for me in order to exclude mistake on my side
I have set up several webserver instances where to host the calendar.ics - file

I open the open_web_calendar page on http://homeserver.local:8000 and enter the following three urls.
If I enter the urls to the alendar.ics file directly in the browser, they open properly and the text-content is shown within the browser.

http://homeserver.local/calendar.ics -> Works like a charm
http://homeserver.local:8085/calendar.ics -> Produces "Error message 1)" below
https://homeserver.local:8083/calendar.ics -> Produces "Error message 2)" below

Could you please try to reproduce this error message for me before I open an Issue - Ticket?

Thanks a lot!

Sailor

Error message 1)

ConnectionError
http://homeserver.local:8085/calendar.ics

('Connection aborted.', RemoteDisconnected('Remote end closed connection without response'))

Traceback (most recent call last):
  File "/home/fhem/venv/lib/python3.11/site-packages/urllib3/connectionpool.py", line 789, in urlopen
    response = self._make_request(
               ^^^^^^^^^^^^^^^^^^^
  File "/home/fhem/venv/lib/python3.11/site-packages/urllib3/connectionpool.py", line 536, in _make_request
    response = conn.getresponse()
               ^^^^^^^^^^^^^^^^^^
  File "/home/fhem/venv/lib/python3.11/site-packages/urllib3/connection.py", line 507, in getresponse
    httplib_response = super().getresponse()
                       ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/http/client.py", line 1374, in getresponse
    response.begin()
  File "/usr/lib/python3.11/http/client.py", line 318, in begin
    version, status, reason = self._read_status()
                              ^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/http/client.py", line 287, in _read_status
    raise RemoteDisconnected("Remote end closed connection without"
http.client.RemoteDisconnected: Remote end closed connection without response

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/fhem/venv/lib/python3.11/site-packages/requests/adapters.py", line 667, in send
    resp = conn.urlopen(
           ^^^^^^^^^^^^^
  File "/home/fhem/venv/lib/python3.11/site-packages/urllib3/connectionpool.py", line 843, in urlopen
    retries = retries.increment(
              ^^^^^^^^^^^^^^^^^^
  File "/home/fhem/venv/lib/python3.11/site-packages/urllib3/util/retry.py", line 474, in increment
    raise reraise(type(error), error, _stacktrace)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/fhem/venv/lib/python3.11/site-packages/urllib3/util/util.py", line 38, in reraise
    raise value.with_traceback(tb)
  File "/home/fhem/venv/lib/python3.11/site-packages/urllib3/connectionpool.py", line 789, in url

Error message 2)

SSLError
https://homeserver.local:8083/calendar.ics

HTTPSConnectionPool(host='homeserver.local', port=8083): Max retries exceeded with url: /calendar.ics (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:992)')))

Traceback (most recent call last):
  File "/home/fhem/venv/lib/python3.11/site-packages/urllib3/connectionpool.py", line 466, in _make_request
    self._validate_conn(conn)
  File "/home/fhem/venv/lib/python3.11/site-packages/urllib3/connectionpool.py", line 1095, in _validate_conn
    conn.connect()
  File "/home/fhem/venv/lib/python3.11/site-packages/urllib3/connection.py", line 730, in connect
    sock_and_verified = _ssl_wrap_socket_and_match_hostname(
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/fhem/venv/lib/python3.11/site-packages/urllib3/connection.py", line 909, in _ssl_wrap_socket_and_match_hostname
    ssl_sock = ssl_wrap_socket(
               ^^^^^^^^^^^^^^^^
  File "/home/fhem/venv/lib/python3.11/site-packages/urllib3/util/ssl_.py", line 469, in ssl_wrap_socket
    ssl_sock = _ssl_wrap_socket_impl(sock, context, tls_in_tls, server_hostname)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/fhem/venv/lib/python3.11/site-packages/urllib3/util/ssl_.py", line 513, in _ssl_wrap_socket_impl
    return ssl_context.wrap_socket(sock, server_hostname=server_hostname)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/ssl.py", line 517, in wrap_socket
    return self.sslsocket_class._create(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/ssl.py", line 1108, in _create
    self.do_handshake()
  File "/usr/lib/python3.11/ssl.py", line 1379, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:992)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/fhem/venv/lib/python3.11/site-packages/urllib3/connectionpool.py", line 789, in urlopen
    response = self._make_request(
               ^^^^^^^^^^^^^^^^^^^
  File "/home/fhem/venv/lib/python3.11/site-packages/urllib3/connectionpo

[niccokunzmann]

Hi, could you share the code that creates these errors? Is it on a website?

I wonder: Error message 2) seems like an SSL error.... custom certificate not accepted maybe?

[Sailor-Fhem]

Which code do you mean?
I am using the unchanged code from this repository. Nothing special.
The ics - file is identical in all 3 cases.

Error message 2 is indeed referring to my custom certificate. However it has been already accepted in the same browser.
Should be OK, since I can open the https://homeserver.local:8083/calendar.ics as text file within the same browser without accepting the custom certificate again. The exception has been granted for the browser once.

[niccokunzmann]

For error 3: The Open Web Calendar does not use the browser to get the ics file. It does its own request. The certificate needs to be accepted on the server. This should work: https://stackoverflow.com/a/43935319/1320237