Adding a link returns an HttpRequestException

[rickvdbosch]

Trying to call Post with a URL that starts with https throws an HttpRequestException: Response status code does not indicate success: 406 (Not Acceptable)`.

This happens for both a URL in the text to post as well as with a URL in a separate Uri:

await client.Post("Testing!", new Uri("https://www.github.com"));

await client.Post("Testing! https://www.github.com");

Removing the link does post the message.

Removing the https:// from the link posts the message, but with the URL, of course, not recognized as a link.

await client.Post("Testing! www.github.com");

[a-gubskiy]

Sorry, but I can't reproduce this problem. Maybe some network restrictions exist on server which you use to run app?
Client library making some requests to extract metadata from page. Maybe outgoing connections blocked?