shinyproxy: [Bug Report] AJAX error in the new release of ShinyProxy (version 2.2.0+)

In the new release version (2.2.0) of ShinyProxy, all the Apps that use DT with server processing mode will break. The browser complains Ajax errors while ShinyProxy log says Request Methods ‘Post’ not supported.

Screen Shots

An example app

library(shiny)
ui <- fluidPage(DT::DTOutput('tbl'))
server <- function(input, output, session) {
  output$tbl <- DT::renderDT(iris, server = TRUE)
}
shinyApp(ui, server)

I actually set up a docker-compose example for this, see https://github.com/shrektan/shinyproxy-docker-compose-example

About this issue

Original URL
State: closed
Created 5 years ago
Reactions: 1
Comments: 46 (15 by maintainers)

Commits related to this issue

Update application.yml Fixing Ajax Datatable bug - https://github.com/openanalytics/shinyproxy/issues/137, https://github.com/openanalytics/shinyproxy/issues/140 — committed to buschlab/MIRACUM-cbioportal by arsenij-ust 2 years ago

Most upvoted comments

Thanks! We can reproduce this and are working on it.

tverbeke on Mar 28, 2019

Hi @giordyb

Thank you for your example deployment and report. I looked into the issue today and it’s quite a strange issue. The problem is caused due to having debug logging enabled. There is one class DispatcherServlet which will log the parts of the requests send through ShinyProxy. However, this causes issue with some proxied requests, because part of those requests can only be read once. Therefore the Shiny app received an invalid request.

The solution is to disable debug logging for the org.springframework.web.servlet.DispatcherServlet class as follows:

logging:
  level:
     root: DEBUG
     org:
        springframework:
           web:
              servlet:
                 DispatcherServlet: INFO

This will be the default in the next ShinyProxy release, so that this workaround is no longer needed.

LEDfan on Oct 28, 2020

Hi @LEDfan,

thank you for looking into this so promptly. I added the logging configuration as you suggested and now everything is working as expected, so I’m a happy camper.

thank you very much for your help!

giordyb on Oct 28, 2020

Just add my two cents here. In order to ensure DT works behind a load balancer (Traefik) , I recently created a simple repo DT-load-balancer based on Docker swarm, with detailed setups… I think with a little effort, you can turn it into a reproducible example for ShinyProxy about this issue…

shrektan on Oct 26, 2020

Just adding a ‘me too’. The issue is with Keycloak authorization backend and does not otherwise show up. Reverting to 2.1 works as expected.

dpavlic on Dec 9, 2019

We were able to reproduce with Keycloak. A fix will be in the next release.

tverbeke on May 1, 2020

Encountering this also with KeyCloak Auth and any ShinyProxy version > 2.1.0

tjpalanca on Apr 2, 2020

the same problem with billy34 in ShinyProxy 2.3.0, use DT::renderDataTable still have same ajax error 503 use keycloak v7.0.0 for Authentication/Authorization but reverse to 2.1 will work fine

Example App

library(shiny) ui <- fluidPage(DT::dataTableOutput('tbl')) server <- function(input, output, session) { output$tbl <- DT::renderDataTable({ DT::datatable(iris, class = 'cell-border stripe') }) }

chienyuchuan on Sep 13, 2019

@shrektan : if you look at the shinyproxy download page (https://www.shinyproxy.io/downloads/), you can download either a platform-independent file (.jar), or a deb file specific to Ubuntu that you install with dpkg. I chose that vs. the platform independent file.

bogdanrau on Apr 17, 2019

Hello @dylancis: the original problem is definitely fixed as confirmed by our tests and by @shrektan. For the issue reported by @bogdanrau, we don’t have a reproducible example yet or (confirmation from another user there is still an issue).

tverbeke on Apr 5, 2019

@shrektan thanks for reporting the issue. A fix has been committed: https://github.com/openanalytics/containerproxy/commit/6455abdaed031297baf600f5e71e2242b689d940

Can you please give this dev build a try and see if it fixes the problem? https://nexus.openanalytics.eu/nexus/content/repositories/snapshots/eu/openanalytics/shinyproxy/2.2.1-SNAPSHOT/shinyproxy-2.2.1-20190329.093240-2.jar

fmichielssen on Mar 29, 2019