A number of form submissions (or http-POST requests) occur in the gateway UI. In particular the Data Transfer Request submission uses a POST method to submit potentially large file listing the the Data Transfer Controller. This method may cause the user to re-submit the request multiple times when "refreshing" the browser page (which raises a dialog asking the user if they want to "resend the POSTDATA...") Ideally the Post-Redirect-Get (PRG) pattern would be used here to prevent the multiple form submissions. Other POST request based UI workflow would benefit from this as well (filter files, select files, etc.)