error:websocket: bad handshake

[jcarm010]

Having this issue in a machine with OSX 10.10.5 and the app was compiled in OSX 10.11.5.
It is working correctly on other machines with OSX 10.9.5, 10.10.3, 10.10.5, 10.11.4, 10.11.5

from github.com/zhouhui8915/engine.io-go/websocket/client.go, func NewClient, "resp" is:
&{Status:400 Bad Request StatusCode:400 Proto:HTTP/1.1 ProtoMajor:1 ProtoMinor:1 Header:map[X-Cache-Lookup:[MISS from m8815449E1B30:3128] Via:[1.1 m8815449E1B30 (squid/3.3.5)] Server:[nginx/1.8.0] Date:[Wed, 18 May 2016 13:49:09 GMT] Content-Type:[application/json] Access-Control-Allow-Origin:[*] X-Cache:[MISS from m8815449E1B30]] Body:{Reader:0xc82087d500} ContentLength:-1 TransferEncoding:[] Close:true Trailer:map[] Request:0xc820668c40 TLS:}

from github.com/zhouhui8915/engine.io-go/websocket/client.go, function NewClient, "err" is:
websocket: bad handshake

here is the content of resp.Body:
{"code":3,"message":"Bad request"}