How to handle form submit timeout to external site

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C#

Javascript

Ajax

Hi,

We have a scenario where we are submitting a form to external site with some hidden input variables, one of which is "redirecturl" which is used by external site to redirect to after it has completed its operation. This variable points to a page in our site.

We want to handle the time out or server unavailability of the external site, after we submit the form. Till now we have not been able to find any decent solution using javascript.

Any solution/pointer would be helpful.

Thanks
Jas