I have a problem with a crashing app on shiny server pro that runs completely fine locally (not a single crash).
I cannot reproduce the problem with a small app, but I will give as much info as possible:
We have a shiny app deployed on Shiny Server Pro (version 1.5.11.994), running R 3.6.0 (further below the full devtools::session_info).
The app includes links to properties (i.e. buildings) that are shown in a separate tabItem (this is using shinydashboard), using a hard link make with updateQueryString, for example if the user wants to inspect property with id = id, we use:
updateQueryString(glue("#/tabCasus/{id}"), mode = "push")
Then, we have an observeEvent that activates the sidebar tab, like so (slightly simplified):
observeEvent(getUrlHash(), {
hash <- substring(getUrlHash(), 2)
cat(file=stderr(), paste("Current hash:", hash), "\n")
s <- strsplit(hash, "/")[[1]]
entity_type <- s[2]
updateTabItems(session, "sidebar", entity_type)
})
Normally, and when the app is run locally, this allows text links like glue('<a href="#/tabCasus/{id}">'), which we use inside datatable's and elsewhere to link to properties.
Clicking a link inside the app will make the URL change to, e.g.:
site.ourdomain.net/ourapp/#/tabCasus/5656BB_1_
Locally the app works without a problem, but deployed on Shiny Server Pro it crashes after the URL does not switch nicely to the above, but rather something like:
site.ourdomain.net/ourapp/_w_93eac17e0bb80fa6b911df65670d0d0ca93452470b18b808/#/tabCasus/5656BB_1_
Why does the URL switch to this version, but not always? Hovering over any link in the app always shows the hashed bit, but after clicking on it it usually does not show up in the browser URL.
The shiny server logs at /var/log/shiny-server/ don't say anything (no warnings or errors on the R side.).
The JS log in my browser (I have tested both Chrome and Edge) complain about web sockets, but irregularly. For example:
That second warning I always see, the first one rarely.
And finally, I sometimes get this error (but not always):
Uncaught TypeError: Cannot read property 'readyState' of null
(again, in the JS console in Chrome).
Any hints,ideas? Thanks!!
Remko Duursma
─ Session info ───────────────────────────────────────────────────────────────
setting value
version R version 3.6.0 (2019-04-26)
os Ubuntu 16.04.6 LTS
system x86_64, linux-gnu
ui X11
language (EN)
collate en_US.UTF-8
ctype en_US.UTF-8
tz Etc/UTC
date 2019-07-16
─ Packages ───────────────────────────────────────────────────────────────────
package * version date lib
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class 7.3-15 2019-01-01 [3]
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config * 0.3 2018-03-27 [1]
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