Long urls will not display on the forum. They get spaces added to them otherwise they break the layout of the page. The only way to have a functioning url is to use a url shortener like tinyurl.
I don’t know how it’s done technically, but I’ve visited forums where the URL is shortened, like “Support & Feedback Forum - Language Forum @ LingQ…” but a mouse-over would display the whole URL (in the status bar at the bottom of the browser).
Surely there must be scripts around that shorten strings visually (not that it’s a big problem using Tinyurl, but it’s a few steps more than just writing the post).