Shiny v1.4 - CSS not downloading behind Nginx

ShinyProxy
#1

Hi all,

I’ve hit a new & potentially reproducible issue - similar to:

but the workaround isn’t working for me with an image built with shiny v1.4.

My Nginx is in front of Shinyproxy, with a config file something like this:

location / {
         proxy_pass               https://myshinyproxy:8080;
         proxy_ssl_trusted_certificate  /path/to/ca_cert;
         proxy_ssl_certificate          /path/to/cert;
         proxy_ssl_certificate_key      /path/to/key;
         proxy_ssl_session_reuse        off;
         proxy_ssl_protocol             TLSv1.2;

         proxy_redirect                 / $scheme://$http_host/;
         proxy_http_version             1.1;
         proxy_set_header               Upgrade $http_upgrade;
         proxy_set_header               Connection     $connection_upgrade;
         proxy_read_timeout             20d;
         proxy_buffering                off;
         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-Proto     $scheme;
}

To reproduce:

Launch either openanalytics/shinyapps-demo or openanalytics/shinyapps-template from prebuilt images (I’m guessing shiny <v1.4?)

The CSS etc loads fine.

Then build the same dockerfiles and use these images instead - CSS, js etc all fail to load for me, despite loading fine on a build that isn’t behind Nginx.

Can anyone else replicate this?

Any suggested workarounds, other than the above, or rolling back to something that does work?

Thanks,

Stuart

#2

After an evening troubleshooting this it’s the same bug - problem starts when shifting from shiny 1.2.0 to 1.3.0, but doesn’t improve with 1.3.1, 1.3.2 or 1.4.0 despite the apparently ‘fixed’ nginx config & mentions of a ‘fix’ (relaxed Connection header interpretation) in 1.3.1 or httpuv 1.5.2.

OK i have an unusal setup running shinyproxy on istio, so I’ll look into ways to replicate the nginx config in istio itself, but I can’t really understand why the ‘fixed’ version wouldn’t work for me while the <v1,3 does, even if istio is enforcing Connection: ‘upgrade’.

Anyway, thought I’d leave an update here for future visitors. I’ll take it to the shiny maintainers.

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