modified for actix-web v4.1.0

[anosatsuk124]

I have updated impl actix_web::Responder for DavResponse for actix-web v4.1.0 and passed a build with default and actix-compat features.

[LinusCDE]

Tested it. It seems that DavRequest::prefix(&self) doesn't recognize the path properly. For some reason the HttpRequest::match_info(&self) doesn't return the {tail:.*} identifier for me. match_name() is also an empty string for me.

Here, the variable path is empty for me. Using req.path() fixes that. But tail also is always empty, so the prefix cannot be calculated anyway.

Taking the left handside of a { using the string from match_pattern() seems to give the intended prefix, but is a dirty workaround imo.

Either there is a new proper way of doing it now or my setup has some weird thing going on that breaks this check. Would be interesting to know if it's just me or affecting others as well.