Depending on the versions of your operating system and therefore libcurl, the following code may give an "Failed sending HTTP2 data" error message and fail.

files <- getBridgeNames("Hs")

This happens, for example, with Debian GNU/Linux stable if libcurl is using libcurl4-gnutls-dev instead of libcurl4-openssl-dev.

Users of the stable release of Debian GNU/Linux can install libcurl4-openssl-dev and then reinstall the R package curl:

sudo apt install libcurl4-openssl-dev

Followed by R code:

install.packages(c("curl"))