Does POST function support http2?

Hello, I saw plenty of examples in different tickets on how to enable http2 support in GET requests (https://github.com/visionmedia/superagent/pull/1399#issuecomment-409544917), but I could not find any examples of enabling it in POST requests.

I've set the http2 property to true
`superagent.http2 = true;
superagent
.post(ajaxUrl +
"?module=" +.....`
However, whenever I look at my nginx access logs, the POST request is showing as http1.1. Is there any explanation for why running the same code in the browser reports http2, but running it in a node process shows as http 1.1? Thanks in advance