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The error page for unsupported URI schemes should not display only the options part of the revalidation form. Either display all of the form (my +1), or none of it. Reproducible in 0.6.1 eg. with surfing to <http://validator.w3.org/check>
This exception is thrown too early for us to output a complete Revalidate form. I've changed the code so we can supress the form entirely in the exception handler when it's called too early.