I have an R package with a vignette that demonstrates a function that downloads cDNA fasta files from Ensembl’s FTP site. Everywhere else the URL used by the function works, both on my lab’s Linux server and my own computer, yet on Travis CI, that same URL can’t be opened. Here’s the log: https://travis-ci.com/github/BUStools/BUSpaRse/jobs/323497059
Why does this happen? Is it because of poor network in Travis instances and it takes too long to download the file (up to 80MB)?