jujucharms.com/new/ with deploy-target query parameter breaks back button

[hatched]

Copied from: https://github.com/CanonicalLtd/jujucharms.com/issues/471

If you start a session using a link like this: https://jujucharms.com/new/?deploy-target=bundle/canonical-kubernetes-76

you will get the contents of the bundle, and be redirected to https://jujucharms.com/new

if you then try to go back using your browser's back button, the first click does nothing, then the second click adds another copy of the bundle.

I tested with Chrome 59.0.3071.115 just now, and was unable to get back past the jujucharms.com/new page, I just get more copies of the bundle.

[clagom]

Is this still relevant?

[hatched]

It is