If the content-type of the POST body is application/x-www-form-urlencoded, it is not available here, but instead is available in its decoded form through xdmp:get-request-field-names() and xdmp:get-request-field().

If there is no content-type header in the request, then the request body defaults to application/x-www-form-urlencoded, and therefore xdmp:get-request-body will return the empty sequence. If you want to read the request body, then the POST must include a content-type header.

You can use this function to process certain types of web service SOAP requests with MarkLogic Server.

The output of an xdmp:get-request-body call is typically a document node, so if you want to get the contents of the POST, you should add a /node() XPath step to the output. The contents of the document node could be a text node, an element node, or a binary node.