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odd warning looking up Bioconductor packages

I've been getting the same warning for a while. The BioConductor approved way is to use `source("https://bioconductor.org/biocLite.R"); biocLite(c("pkg_name")). It has not affected my ability to install BioC packages, so I've been ignoring it. The other reason I've been ignoring it is that I'm not using the approved method. I thought it is from R.app using an old address with the "http" not being "https" some place in the Package Installer script.

I can get it just by clicking on the "Get List" button of the GUI Package Installer panel with Bioconductor (binaries) selected. If I choose to reinstall pkg:"a4" is get the warning again then 

trying URL 'http://www.bioconductor.org/packages/3.6/bioc/bin/macosx/el-capitan/contrib/3.4/a4_1.26.0.tgz'
Content type 'application/x-gzip' length 966139 bytes (943 KB)

.... followed by the reports of success and then another warning. So maybe it's not the "http" but rather the target website.