When copying a URL to external problems, make sure that you are using Edit > Copy As > Plain Text (Cmnd-Shift-C on Mac)... or otherwise remove the line continuation characters ("\") that the Front End inserts in the copied text.

As yet another trick, you can execute:

Hyperlink[url]

... and then click the output link. That will use the correct URL in your default web browser.

When copying a URL to external programs, make sure that you are using Edit > Copy As > Plain Text (Cmnd-Shift-C on Mac)... or otherwise remove the line continuation characters ("\") that the Front End inserts in the copied text.

As yet another trick, you can execute:

Hyperlink[url]

... and then click the output link. That will use the correct URL in your default web browser.