[racket] WebServer not finding param in POST but does so in GET???

(define bs (request-bindings req))
...
    [(exists-binding? 'stat bs)
     (handle-post-stat (extract-binding/single 'stat bs))]

The above cond clause evaluates when Browser invokes

    $.ajax({
      type: "GET",
      url: "/abc/xyz",
      data: {stat: JSON.stringify( data )},

But not when POST is used. Why would this be the case?

Curiously,

jGc