Can a PDF fillable form post itself to an HTTPS URL?
Yes, there is an option (action) that allows pdfs to post themselves. The steps are as follows:
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Open Adobe Acrobat Pro
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Select the button tool
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Add submit form button
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Add the url and how you want the form to be submitted. You're done.
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The warning shown when the user clicks the "submit a form" button.
This can also be done in Adobe LiveCycle.