[winswitch] Xpra HTML5 Post example.

[w robbi]

Been trying to get post to work and not able to find the right information
to pass.  Is there an example somewhere?
https://xpra.example.com/?username=user&password=pass1

<form action="http://xpra.example.com/index.html" method="get">
  <label for="username">Username:</label>
  <input type="text" id="username" name="username"><br><br>
  <label for="password">Password:</label>
  <input type="text" id="password" name="password"><br><br>
  <button type="submit">Xpra with GET</button>
  <button type="submit" formmethod="post">Xpra with POST</button>
</form>