Response.Redirect with POST instead of Get?

Question :

Response.Redirect with POST instead of Get?,

Answer :

We have the requirement to take a form submission and save some data, then redirect the user to a page offsite, but in redirecting, we need to “submit” a form with POST, not GET.

I was hoping there was an easy way to accomplish this, but I’m starting to think there isn’t. I think I must now create a simple other page, with just the form that I want, redirect to it, populate the form variables, then do a body.onload call to a script that merely calls document.forms[0].submit();

Can anyone tell me if there is an alternative? We might need to tweak this later in the project, and it might get sort of complicated, so if there was an easy we could do this all non-other page dependent that would be fantastic.

Anyway, thanks for any and all response


Doing this requires understanding how HTTP redirects work. When you use Response.Redirect(), you send a response (to the browser that made the request) with, which tells the browser where to go next. By definition, the browser will make that via a GET request, even if the original request was a POST.

Another option is to use which specifies that the browser should make the redirect request in the same way as the original request, but to prompt the user with a security warning. To do that, you would write something like this:

public void PageLoad(object sender, EventArgs e)  {      // Process the post on your side           Response.Status = "307 Temporary Redirect";      Response.AddHeader("Location", "");  }  

Unfortunately, this won’t always work.  since it is not a common status code.

Alas, unlike the Opera and FireFox developers, the IE developers have never read the spec, and even the latest, most secure IE7 will redirect the POST request from domain A to domain B without any warnings or confirmation dialogs! Safari also acts in an interesting manner, while it does not raise a confirmation dialog and performs the redirect, it throws away the POST data, effectively changing 307 redirect into the more common 302.

So, as far as I know, the only way to implement something like this would be to use Javascript. There are two options I can think of off the top of my head:

  1. Create the form and have its action attribute point to the third-party server. Then, add a click event to the submit button that first executes an AJAX request to your server with the data, and then allows the form to be submitted to the third-party server.
  2. Create the form to post to your server. When the form is submitted, show the user a page that has a form in it with all of the data you want to pass on, all in hidden inputs. Just show a message like “Redirecting…”. Then, add a javascript event to the page that submits the form to the third-party server.
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Of the two, I would choose the second, for two reasons. First, it is more reliable than the first because Javascript is not required for it to work; for those who don’t have it enabled, you can always make the submit button for the hidden form visible, and instruct them to press it if it takes more than 5 seconds. Second, you can decide what data gets transmitted to the third-party server; if you use just process the form as it goes by, you will be passing along all of the post data, which is not always what you want. Same for the 307 solution, assuming it worked for all of your users.

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Hope this helps!

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