OpenWrap2 fails to properly parse index.wraplist with "Transfer-Encoding: chunked"

[ancow]

If I try to use a wraplist larger than 8000 bytes, OW2 completely ignores it. list-wrap says the corresponding repository is empty.

Edit: Some further study has shown that my Apache2 sends files this "large" with the "Transfer-Encoding: chunked" header. OW2 seems unable to handle this (probably because the content length isn't set in this context.

[ancow]

It turns out that in C#, the content length is set to "-1" if it isn't specified. According to the HTTP/1.1 specification, not specifying content-length when transfer-encoding is set to "chunked" is valid behaviour, so the above commit checks for its presence and extends ProgressStream to support having an unknown final length.
This solution works for me (tested in conjunction with the invalid SSL certificate) on a remote server running Apache.