CouchDB: POST Data with Update Handler

[Hank Knight]

I understand that I can pass information using an update handler like this:

http://127.0.0.1:5984/my_database/_design/my_designdoc/_update/in-place-query/mydocId?field=title&value=test

Is there a way to use POST data with an update handler?

I would like to post this data:
{
   "hello": "world",
   "x": 123
}

through an update handler.

Thanks.