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Gentle handling of back-button returns to pages with stale message-passing credentials
author Adam Chlipala <adam@chlipala.net>
date Sun, 28 Aug 2011 17:16:54 -0400
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table channels : { Channel : channel {} }

fun get () =
    ch <- channel;
    dml (INSERT INTO channels (Channel) VALUES ({[ch]}));
    return <xml><body onload={recv ch}>
      Hi.
    </body></xml>

fun post () =
    ch <- channel;
    dml (INSERT INTO channels (Channel) VALUES ({[ch]}));
    return <xml><body onload={recv ch}>
      Hi!
    </body></xml>

fun main () = return <xml><body>
  <li><a link={get ()}>Get</a></li>
  <li><form><submit action={post}/></form></li>
</body></xml>