Question: How do you make an HTTP POST request to an external service within Exist DB, ideally using just XQuery?
Motivation: I want to take a set of XML documents in Exist DB, and send each to an external server for processing, then I want to receive the result, and store them back in Exist DB.
I can accomplish this with an external script that interacts with the Exist DB REST interface, but I would like to it all within Exist DB and XQuery. Marklogic has a http request function that does POST requests under the xdmp namespace, which seems to accomplish this. Does something similar exist for Exist-DB?
Bonus points if the request body can be sent in JSON format.
eXist-db implements the EXPath HTTP Client specification, which defines a function, http:send-request, that can perform HTTP POST requests.
For sample code, including sending a request body containing JSON, see eXist-db send JSON via POST request using eXPath Http_module.