I have gone down a rabbit hole trying to set up Github actions to check the builds of my packages via usethis::use_github_action_check_standard(). The function fails when it tries to pull the .yaml file from the r-lib repo. I am stuck trying to figure out why readLines() fails for me. It appears that readLines() fails for any files from Github, but does work for files from other locations.
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## random .txt file works
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readLines("https://filesamples.com/samples/document/txt/sample1.txt")
#> Warning in readLines("https://filesamples.com/samples/document/txt/
#> sample1.txt"): incomplete final line found on 'https://filesamples.com/samples/
#> document/txt/sample1.txt'
#> [1] "Utilitatis causa amicitia est quaesita."
#> [2] "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Collatio igitur ista te nihil iuvat. Honesta oratio, Socratica, Platonis etiam. Primum in nostrane potestate est, quid meminerimus? Duo Reges: constructio interrete. Quid, si etiam iucunda memoria est praeteritorum malorum? Si quidem, inquit, tollerem, sed relinquo. An nisi populari fama?"
#> [3] ""
#> [4] "Quamquam id quidem licebit iis existimare, qui legerint. Summum a vobis bonum voluptas dicitur. At hoc in eo M. Refert tamen, quo modo. Quid sequatur, quid repugnet, vident. Iam id ipsum absurdum, maximum malum neglegi."
#
##
## random .yaml file also works (very long, not showing output)
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# readLines("https://wg21.link/index.yaml")
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## .yaml file from github does not work
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readLines("https://raw.githubusercontent.com/r-lib/actions/master/examples/check-standard.yaml", encoding = "UTF-8")
#> Warning in file(con, "r"): InternetOpenUrl failed: 'A connection with the server
#> could not be established'
#> Error in file(con, "r"): cannot open the connection
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## .txt file from github does not work
##
readLines("https://raw.githubusercontent.com/neslib/Neslib.Yaml/master/License.txt")
#> Warning in file(con, "r"): InternetOpenUrl failed: 'A connection with the server
#> could not be established'
#> Error in file(con, "r"): cannot open the connection
I have tried checking and unchecking Use Internet Explorer library/proxy for HTTP in the RStudio options to no effect.
Created on 2021-08-05 by the reprex package (v2.0.0)
For anyone else who might hit this problem - I lost the Warning in file(con, "r"): InternetOpenUrl failed: 'A connection with the server could not be established' warnings after enabling TLS 1.2:
Found this solution after getting the same set of errors (as in the question) when using download.file(), where the default method for Windows is wininet.dll