In my hands (R 3.4.1, CONICSmat_0.0.0.1), these http prefixes cause the following error:
Request to BioMart web service failed.
The BioMart web service you're accessing may be down.
Check the following URL and see if this website is available:
http://http://dec2016.archive.ensembl.org:80/biomart/martservice?type=registry&requestid=biomaRt
Error in if (!grepl(x = registry, pattern = "^\n*<MartRegistry>")) { :
argument is of length zero
In my hands (R 3.4.1, CONICSmat_0.0.0.1), these http prefixes cause the following error:
Dropping the http fixes that issue