the only way i can immediately think of is by processing the response and then making your app behave accordingly.

for instance - i tried one test form and if the request send had some required field empty, then the httpresponse contains "looks like you have a question or two that still need attention".

another way would be to validate if the save was actually successful by searching for the text you gave in the "confirmation page".

in both cases, you should be able to differentiate between a successful post and a failed one.

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