Hi,
I am running OH 2.4 official and did set up an Nginx-Proxy to access my internal installation from the outside according to the Wiki.
All runs well besides an occasional “offline” in BasicUI and nginx error-log telling:
upstream timed out (110: Connection timed out) while reading upstream, client: xx.xx.xx.xx, server: openhab.xx.xx, request: “GET /rest/sitemaps/events/0846c4f0-ce6c-4606-b278-786aa03c2cee?sitemap=yyy&pageid=yyy HTTP/1.1”
I found related posts talking about the scheme (http/https) but this did not solve it.
Further analysis showed that the problem is only the event-stream XHR backchannel from OH via nginx to the browser.
Nginx does some default buffering/caching and that does not play well with the XHR streams. I real fix would probably be in the Runtime/Jetty to set an HTTP-header only for the XHR-backchannel like this
Cache-Control: no-cache;
X-Accel-Buffering: no;
as mentioned here.
As a workaround (that indeed works works for me) is to really disable any kind of buffering and a large timeout while proxying to OH:
location / {
proxy_pass http://your-openhab-server-and-port;
proxy_buffering off;
proxy_request_buffering off;
proxy_http_version 1.1;
proxy_set_header Host $http_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-Host $server_name;
proxy_set_header X-Forwarded-Proto $scheme; // or just "https" to force it
client_body_buffer_size 0;
client_max_body_size 0;
proxy_max_temp_file_size 0;
proxy_read_timeout 18000;
proxy_send_timeout 18000;
gzip off;
}
If anybody else is experiencing these “offline” messages, please give my workaround a try and post your results here (so the wiki for proxying with nginx could be updated).
As this disables any buffering/caching of other stuff as well (sitemaps, icons and so on) it would be great to give this extra http-header a try (does not hurt other proxies or if no proxy is used at all).
I am not a Java-guy, so I can’t do it myself, but I could test a nightly/special build.
Thanks,
-Markus
