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Asked: 2026-05-27T03:44:20+00:00

I want to post some data to the server, and in response, I want

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I want to post some data to the server, and in response, I want to create a CSV file, with application/excel as the MIME Type (recently recognized as Internet Media Type), to force the browser to open the generated CSV file in Microsoft Excel. However, I also want to prevent user from re-submitting the same info (re-posting the form) by any accident as the result of refreshing the page.

With simple CRUD operations, I use Post/Redirect/Get pattern, so that any further refreshing will only send HTTP Get Request to the server, without any parameter, thus not changing server’s state (Idempotence).

What is the recognized pattern for stopping user from re-submitting (re-posting) the same info to the server, when the response is not a page, but a file?

Any idea?

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1 Answer

  1. Editorial Team

    The Post/Redirect/Get pattern is an answer to a browsing event.
    Here, there is no browsing action (the form submission only open a 3rd party app, i.e excel), and so any kind of browsing related pattern will be useless.

    I suggest you use both a server side trace of the initial submission (with a unique token maybe), so you can prevent the file generation, and an easy to write client side script like <form onsubmit="this.onsubmit = function(){ return false ; }">

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