for example, https://bitbucket.org/skskeyserver/sks-keyserver/downloads contains:

#!html
            <td class="name"><a class="execute" href="
                    /skskeyserver/sks-keyserver/downloads/sks-1.1.6.tgz">sks-1.1.6.tgz</a>
            </td>

This makes systems like debian's automated source update trackers fail (see uscan(1), debian/watch).

Please don't add this leading whitespace in the href!