CouchDB _session not returning cookie - google-chrome

Question

Environment:
CouchDB 2.2.0 running on VirtualBox, running up-to-date Debian image. Network type is bridged, all ports are open, no https.
Vue3.js app (not using any Vue functionality to access the DB)
Remote access JS package:
axios
fetch
Browser: Chrome latest
Relevant CouchDB local.ini settings
[couch_peruser]
enable = false
delete_dbs = false
[chttpd]
port = 5984
require_valid_user = false
proxy_use_secret = false
bind_address = 0.0.0.0
authentication_handlers = {chttpd_auth, cookie_authentication_handler}, {chttpd_auth, default_authentication_handler}
[httpd]
bind_address = 127.0.0.1
enable_cors = true
(default authentication handlers set in default.ini)
authentication_handlers = {couch_httpd_auth, cookie_authentication_handler}, {couch_httpd_auth, default_authentication_handler}
[couch_httpd_auth]
secret = (hash num)
require_valid_user = false
allow_persistent_cookies = true
[cors]
origins = *
headers = accept, authorization, content-type, X-Auth-CouchDB-UserName, origin, referer
credentials = true
methods = GET, PUT, POST, HEAD, DELETE
What Happens
If I do the query via curl, I get a cookie in the response.
Here's the curl call:
curl -v http://couchman.lcldev:5984/_session \
-H "Content-Type:application/json" \
-H "X-Auth-CouchDB-UserName:<uname>" \
-d '{"name":"<uname>","password":"<passwd>"}'
And here's the response:
< HTTP/1.1 200 OK
< Cache-Control: must-revalidate
< Content-Length: 47
< Content-Type: application/json
< Date: Wed, 10 Oct 2018 21:16:10 GMT
< Server: CouchDB/2.2.0 (Erlang OTP/19)
< Set-Cookie: (cookie info)
<
{"ok":true,"name":"<name>","roles":["<roles>"]}
Yay. I get a cookie.
But if I call it from within my app (with either fetch or axios), I only get these headers:
Response headers:
cache-control,must-revalidate
content-type,application/json
server,CouchDB/2.2.0 (Erlang OTP/19)
No Set-Cookie header.
So, what's up? What am I missing?

Answer 1

Answered in first comment - see thread for more info.