I'm attempting to run shinycannon locally on Mac OS Mojave (10.14.4) — if relevant, my Java version is 1.8.0_121, and Shiny version is 1.3.2.
The error indicates that the local URL "does not appear to be a Shiny application" (it definitely is, normally hosted on shinyapps.io).
$ shinycannon --debug-log --overwrite-output recording.log http://127.0.0.1:3573 [Fatal Error] :964:100: Attribute name "selected" associated with an element type "option" must be followed by the ' = ' character. 2019-07-17 10:23:24.391 ERROR [thread00] - Target URL http://127.0.0.1:3573 does not appear to be a Shiny application.
It seems like the error is related to shinyJsNode, but the pattern it appears to be checking for is in the app source:
<script src="shared/shiny.min.js"></script>
I think there might be a failure with parsing the HTML somewhere before this check, given the message:
[Fatal Error] :964:100: Attribute name "selected" associated with an element type "option" must be followed by the ' = ' character.
Here's the line in question — produced without modification by the Shiny selectInput() function (and as far as I can tell, totally valid HTML):
<option value="Immune Cell Proportion - Common Lymphoid and Myeloid Cell Derivative Class" selected>Immune Cell Proportion - Common Lymphoid and Myeloid Cell Derivative Class</option>
If I had to guess, the error is happening here — but there's no trace associated with the error (and I don't know Kotlin).
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