How to post JSON in Groovy with standard libraries?

Question

What's the easiest way to post JSON to a URL in groovy using only the standard libraries? (ie, without using HttpClient or HttpClientBuilder)

This is a script I'd rather not have to link in lots of other libraries to.

Answer 1

def con = "http://endpointUrl".toURL().openConnection();
con.setDoOutput(true);
con.setDoInput(true);
con.setRequestProperty("Content-Type", "application/json");
con.outputStream.withWriter { writer ->
  writer << jsonString
}

String response = con.inputStream.withReader { Reader reader -> reader.text }