Pandoc error 10 when compiling document and fetching from fonts.gstatic.com

[Richard Morey <richarddmorey-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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I've posted this on StackOverflow here 
<https://stackoverflow.com/questions/76422082/pandoc-error-10-when-compiling-document-and-fetching-from-fonts-gstatic-com> 
but have not gotten any interest in several days, so I'm posting here.

I'm having trouble consistently compiling a particular document with 
rmarkdown::render. I cannot reproduce the issue reliably, unfortunately (it 
happens roughly 1/3 of the time; consostent with it being a network error, 
maybe?), but when it fails, I get the error: 

pandoc document conversion failed with error 10 

from rmarkdown. The "10" is the return code from the system command that 
runs pandoc here 
<https://github.com/rstudio/rmarkdown/blob/10863429024e236389a48f40ab1485620d53d311/R/pandoc.R#L107>
.

When I set pandoc to give debugging information with --verbose the 
following lines are the last ones in stderr:
[INFO] Fetching 
https://fonts.gstatic.com/s/opensans/v34/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTSKmu1aB.woff2... 

[INFO] Fetching 
https://fonts.gstatic.com/s/opensans/v34/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTSumu1aB.woff2... 

[INFO] Fetching 
https://fonts.gstatic.com/s/opensans/v34/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTSOmu1aB.woff2... 

[INFO] Fetching 
https://fonts.gstatic.com/s/opensans/v34/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTSymu1aB.woff2... 

[INFO] Fetching 
https://fonts.gstatic.com/s/opensans/v34/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS2mu1aB.woff2... 

[INFO] Fetching 
https://fonts.gstatic.com/s/opensans/v34/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTSCmu1aB.woff2... 

[INFO] Fetching 
https://fonts.gstatic.com/s/opensans/v34/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTSGmu1aB.woff2... 

Error : pandoc document conversion failed with error 10 

The last line varies, but it always seems to be one of these fonts that is 
the last thing pandoc reports before the error (there are 24 of these font 
fetches in this particular document, as shown by the output in a successful 
compile).

This leads me to believe that there is a problem in fetching one of these 
fonts, but there's no output that says what the problem actually *is*, and 
Error 10 does not seem to be a valid error code from pandoc: pandoc error 
codes 
<https://github.com/jgm/pandoc/blob/c9825761338f56209f69782da0087f9e27fa577b/src/Text/Pandoc/Error.hs#L154>
.

I'm sort of stuck debugging until I figure this out.

I also note there is a similar issue here: NYTimes and 538 Themes Give 
Pandoc Error 10 <https://github.com/jthomasmock/gtExtras/issues/89> - as a 
bonus, it even seems to be related to fonts.gstatic.com, but that out seems 
to be more specific, including a [WARNING] that I don't see in mine.

In case they are helpful, I've put the logs of a failure and success and 
the pandoc command that was run in a gist here: logs 
<https://gist.github.com/richarddmorey/c88bdc16ddc37ac5ff4f34b68cfcdd70>

I'd appreciate any insights into what could cause this and how to fix it.

Best,
Richard

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