Spring WebSocket: Handshake-Fehler aufgrund ungültigen Upgrade-header: null

Traf ich das gleiche problem mit nginx https-proxy für tomcat. Dies ist weil ich habe nicht die Unterstützung der wss-Anfrage. Zur Unterstützung der wss Anfrage, ich habe die config wie folgt:

# WebSocketSecure SSL Endpoint
#
# The proxy is also an SSL endpoint for WSS and HTTPS connections.
# So the clients can use wss://connections 
# (e.g. from pages served via HTTPS) which work better with broken 
# proxy servers, etc.

server {
    listen 443;

    # host name to respond to
    server_name ws.example.com;

    # your SSL configuration
    ssl on;
    ssl_certificate /etc/ssl/localcerts/ws.example.com.bundle.crt;
    ssl_certificate_key /etc/ssl/localcerts/ws.example.com.key;

    location / {
        # switch off logging
        access_log off;

        # redirect all HTTP traffic to localhost:8080
        proxy_pass http://localhost:8080;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        # WebSocket support (nginx 1.4)
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }
}