chrome (throwing a 405)

OPTIONS /_session HTTP/1.1
Host: <myhost>:5984
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache
Access-Control-Request-Method: POST
Origin: http://localhost:3000
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.82 Safari/537.36
Access-Control-Request-Headers:
Accept: */*
Referer: http://localhost:3000/
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en,fr-CH;q=0.8,fr;q=0.6,en-GB;q=0.4

HTTP/1.1 405 Method Not Allowed
Server: CouchDB/1.6.1 (Erlang OTP/R16B03)
Date: Sat, 23 Jul 2016 12:31:12 GMT
Content-Type: text/plain; charset=utf-8
Content-Length: 76
Cache-Control: must-revalidate
Allow: GET,HEAD,POST,DELETE
Access-Control-Expose-Headers: Cache-Control, Content-Type, Server
Access-Control-Allow-Origin: http://localhost:3000
Access-Control-Allow-Credentials: true

{"error":"method_not_allowed","reason":"Only GET,HEAD,POST,DELETE allowed"}

curl command

curl 'http://<myhost>:5984/_session' -X OPTIONS -H 'Pragma: no-cache' -H 'Access-Control-Request-Method: POST' -H 'Origin: http://localhost:3000' -H 'Accept-Encoding: gzip, deflate, sdch' -H 'Accept-Language: en,fr-CH;q=0.8,fr;q=0.6,en-GB;q=0.4' -H 'User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.82 Safari/537.36' -H 'Accept: */*' -H 'Cache-Control: no-cache' -H 'Referer: http://localhost:3000/' -H 'Connection: keep-alive' -H 'Access-Control-Request-Headers: ' --compressed

running curl (returning 205 correctly)

OPTIONS /_session HTTP/1.1
Host: <myhost>:6984
Accept-Encoding: deflate, gzip
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:47.0) Gecko/20100101 Firefox/47.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Access-Control-Request-Method: GET
Origin: http://localhost:3000
Connection: keep-alive

HTTP/1.1 204 No Content
Server: CouchDB/1.6.1 (Erlang OTP/R16B03)
Date: Sat, 23 Jul 2016 12:39:12 GMT
Content-Length: 0
Access-Control-Max-Age: 12345
Access-Control-Allow-Origin: http://localhost:3000
Access-Control-Allow-Methods: GET, PUT, POST, HEAD, DELETE, OPTIONS
Access-Control-Allow-Headers: 
Access-Control-Allow-Credentials: true