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I have a html form in VF page with POST method.while submitting the form the data in the form elements are sent to an external system and in return I've been redirected to a new page with some response data(A html table format).I don't know how to fetch these data into my apex controller for further validation.

Any suggestions are highly appreciated.

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    Commented Dec 17, 2019 at 14:09

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If you're submitting the POST through the browser, your Apex can't get the return value, because the browser has left Salesforce completely. Instead, gather the form elements into your controller, and use an HttpRequest to make the POST, then you can process the response in Apex. See the Invoking Callouts Using Apex documentation for more information on making such a request.

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