Postdata meaning

Data sent from a Web browser or other HTTP client to a Web server. Data such as search words for a query and fields in a fill-in-form are commonly transferred with the POST command. When users click back to a Web page that previously issued a POST, they are generally confronted with a warning that tells them the data on the previous page will be resent to the Web server. For example, if the previous page submitted an order, the submission will be repeated.