Outlook does not seems to be able to connect to `nephele` server

[NamesMT]

I am able to connect with nephele using a simple test client with webdav package.
However, trying to publish an Outlook calendar with Outlook's Publish to WebDAV feature, the connect could not be established.

[NamesMT]

I can confirm the feature (Publish to WebDAV) works normally and Outlook is able to reach other WebDAV servers like this Go implementation

[hperrin]

I'm not sure how to test this. I don't have access to Outlook.

[hperrin]

Can you try this now? I changed one of the responses to better match what other webdav servers do:

6b6ec87