[Catalyst] Double-posted forms

[Christopher H. Laco]

Pedro Melo wrote:
> Apart from JS-powered stuff like disabling the submit button, nothing 
> else to add.

Be very very careful when doing this [in javascript]. That are versions
of browsers out there that submit forms with Content-Length: 0 when the
forms submit button is set to disabled during the onclick event.

I learned that lesson the hard way.

-=Chris
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