proxy_http_version 1.1;
proxy_set_header Host              $host;
proxy_set_header X-Real-IP         $remote_addr;
proxy_set_header X-Forwarded-For   $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Forwarded-Host  $host;

# Kein Puffern: noetig fuer Server-Sent Events ab Phase 4.
proxy_buffering off;
proxy_cache off;

proxy_connect_timeout 5s;
proxy_send_timeout    60s;
# Grosszuegig, damit langlebige SSE-Verbindungen nicht abreissen.
proxy_read_timeout    3600s;