OpenId - return returnTo url with POST instead of GET

Question

How can I make the returnTo URL after someone signs a contract with their openId provider be requested using POST instead of GET?

I have a form in which someone needs to be logged in for POST to work. When they click the Submit button, they redirect them to the login page, and they select their OpenID provider. After successfully selecting and authenticating with his openID provider, he requests the page that she originally tried to request, with the exception of GET.

Answer 1

I do not think that's possible. Here I found a related post: Response.Redirect with POST instead of Get?

Answer 2

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: http://samples.dotnetopenauth.net/v3.3/OpenIdRelyingPartyWebForms/ajaxlogin.aspx