unable to parse content on iOS by calling the login-screen

[oase]

Hello everybody,

since yesterday (2021-09-29) when I try to open the roundcube login screen on an iOS device I got the error message: ERR_INVALID_RESPONSE in Chrome or "Unable to parse response" in Safari.
But on every other device (Microsoft, Android) the site works fine.
Anybody able to help me. The site I try to open is: https://webmail.net4you.net

Thanks in advance
René

[oase]

Anybody who can test the URL with his iOS device and let me know whether the sites work for him or not?

With kind regards
René

[oase]

The problem still occurs.
Anybody able to help me with this?

[oase]

In the Apple-Forum I got the message that I should stick with RoundCube because it might be a specific error of the RoundCube page and not a general problem with the safari rendering engine.

So I'm back here asking for help.
Anybody able to help me?

Thanks in advance
René

[oase]

I found out, that it seems to be related to the protocol. On an Apple device when i use curl with http/1.1 the site will be delivered but when i try it with http2 no response will be received.

Could that be a problem with the RoundCube-System?

Can you analyze this?
With kind regards
René

[SKaero]

That would be a problem with the web server not with Roundcube.

[oase]

But how could it be a problem with the server, when all other OSs and browser can access the site without problem even when HTTP/2 is enabled. Only in connection with Apple-OS and http/2 there is a problem.

[SKaero]

Safari is the new IE 6 not following standards and generously not working very well. I see a lot of Safari only problems now a days. HTTP/2 is handled at the web server layer (Apache/Nginx) not at the Roundcube level so that would be where the change would be needed.

[oase]

Hi SKAero,

in this case we keep HTTP/2 switched off for this roundcube installation, then also safari can handle the login page