I seem to have the same error.
My app works fine if I run it from a server without using https, like http://mydomain:3939, but stops immediately after startup if I reach the exact same app from the same server through: https://mydomain.com (it shows the UI interface, but almost immediately it grays out).
Update, with additional hints:
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when I included the chatty version of httpuv - devtools::install_github('rstudio/httpuv@wch-print-req') - suggested in the github issue mentioned above - https://github.com/rstudio/shiny-server/issues/392 - I did not get any meaningful error message. But when I run the app without https, the following call that appeared in the log relates to DT (datatable)... perhaps something there?
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if I run the same app from a Docker instance of Shiny Server, instead of as the last command of a Docker image, then there's no problem with https and the app works just fine