In the years since this code was added, ALPN is now widely supported,
and NPN is being removed entirely in the latest version of nginx. It's
time to start using ALPN!
In order to be able to POST binary data that may contain NULL-bytes we
must manually specify the size of the array, otherwise cURL will fall
back to `strlen()`.
Instead of erroring out completely when it can't determine if the
certificate is valid, proceed anyway. This matches how web browsers
treat failed cert revocation checks. schannel just has somewhat
paranoid defaults.
Code submissions have continually suffered from formatting
inconsistencies that constantly have to be addressed. Using
clang-format simplifies this by making code formatting more consistent,
and allows automation of the code formatting so that maintainers can
focus more on the code itself instead of code formatting.
