Reverse Proxy not ending connection when downstream ngnix return 304

[DicksengA]

Setup
browser -> vertx-reverse-proxy -> ngnix web-server

When the browser sends http request "If-None-Match" and "If-Modified-Since" header, ngnix returns 304 with chunked.
Notice the reverse proxy does not end connection.

On the chrome network tab, it shows waiting for server to respond.

Tested it also with curl, the respond is also not ending.

Anything required to configure on the reverse proxy?

[tsegismont]

@DicksengA I guess you mean the proxy does not send the browser a response right? Can you clarify?

[DicksengA]

@tsegismont Yes you are right.

[tsegismont]

Can you share a snippet of the proxy setup? Sample HTTP requests?

What do you mean with nginx replies 304 with chunk? In theory, a NOT MODIFIED response does include a body https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/304