Workers allows you to run custom logic based for any incoming request. In addition to the information available on the
Request object, such as headers, Cloudflare provides additional attributes of the request using the
tlsVersion: the TLS version used on the connection to Cloudflare.
tlsCipher: the cipher used on the connection to Cloudflare.
country: the two letter country code on the request (this is the same value as the one provided by the
colo: the three letter airport code of the colo the request hit.