Gem::RemoteFetcher#fetch_path

# File tmp/rubies/ruby-4.0.0/lib/rubygems/remote_fetcher.rb, line 246
def fetch_path(uri, mtime = nil, head = false)
  uri = Gem::Uri.new uri

  method = {
    "http" => "fetch_http",
    "https" => "fetch_http",
    "s3" => "fetch_s3",
    "file" => "fetch_file",
  }.fetch(uri.scheme) { raise ArgumentError, "uri scheme is invalid: #{uri.scheme.inspect}" }

  data = send method, uri, mtime, head

  if data && !head && uri.to_s.end_with?(".gz")
    begin
      data = Gem::Util.gunzip data
    rescue Zlib::GzipFile::Error
      raise FetchError.new("server did not return a valid file", uri)
    end
  end

  data
rescue Gem::Timeout::Error, IOError, SocketError, SystemCallError,
       *(OpenSSL::SSL::SSLError if Gem::HAVE_OPENSSL) => e
  raise FetchError.new("#{e.class}: #{e}", uri)
end