Here are the output from both servers
MYVM:~$ docker exec -it musicbrainz /bin/bash
root@mydockerid:/# curl -X GET -H 'Accept: application/json' -i 'https://musicbrainz.org/ws/2/release/86baa9d0-b610-4721-80ee-bc70f5c0680a'
HTTP/2 200
date: Thu, 28 Mar 2019 23:27:09 GMT
content-type: application/json; charset=utf-8
content-length: 619
vary: Accept-Encoding
x-ratelimit-limit: 1200
x-ratelimit-remaining: 933
x-ratelimit-reset: 1553815630
server: Plack::Handler::Starlet
etag: "7f29fc59f9c248c5f80e0635af92438b"
access-control-allow-origin: *
{"disambiguation":"","barcode":"5099751351825","release-events":[{"date":"2003-10-13","area":{"sort-name":"Germany","name":"Germany","iso-3166-1-codes":["DE"],"disambiguation":"","id":"85752fda-13c4-31a3-bee5-0e5cb1f51dad"}}],"cover-art-archive":{"front":true,"back":false,"count":1,"artwork":true,"darkened":false},"country":"DE","id":"86baa9d0-b610-4721-80ee-bc70f5c0680a","date":"2003-10-13","packaging-id":null,"status-id":"4e304316-386d-3409-af2e-78857eec5cfe","text-representation":{"language":"eng","script":"Latn"},"status":"Official","packaging":null,"title":"The Focus","quality":"normal","asin":"B0000DELA9"}root@3d2b3e37d3d9:/#
my virtual machine:
root@mydockerid:/# curl -X GET -H 'Accept: application/json' -i 'http://192.168.1.18:5000/ws/2/release/86baa9d0-b610-4721-80ee-bc70f5c0680a'
HTTP/1.1 200 OK
Server: nginx/1.14.2
Date: Thu, 28 Mar 2019 23:28:40 GMT
Content-Type: application/json; charset=utf-8
Content-Length: 619
Connection: keep-alive
ETag: "e0089bf4e9497fab66256ba98e45e20c"
Expires: Fri, 29 Mar 2019 00:10:00 GMT
Last-Mod i> fied: Thu, 28 Mar 2019 23:10:00 GMT
Access-Control-Allow-Origin: *
{"asin":"B0000DELA9","release-events":[{"date":"2003-10-13","area":{"iso-3166-1-codes":["DE"],"sort-name":"Germany","disambiguation":"","id":"85752fda-13c4-31a3-bee5-0e5cb1f51dad","name":"Germany"}}],"id":"86baa9d0-b610-4721-80ee-bc70f5c0680a","status-id":"4e304316-386d-3409-af2e-78857eec5cfe","disambiguation":"","text-representation":{"script":"Latn","language":"eng"},"country":"DE","status":"Official","quality":"normal","barcode":"5099751351825","cover-art-archive":{"back":false,"darroot@root@root@3d2b3root@3d2b3e37d3d9:/#root@root@root@3d2b3root@root@root@3d2b3e37d3d9:/#