HTTP RFCs have evolved: A Cloudflare view of HTTP usage trends

On June 6, 2022, a cluster of Internet standards were published that modernize the definition of HTTP, including updates to HTTP/1.1, HTTP/2, and the new HTTP/3. The Internet Engineering Task Force (IETF) has been working on these specifications for some time. Cloudflare's analysis shows that HTTP/2 still comprises the majority of request traffic, with HTTP/3 surpassing HTTP/1.1 in early July 2021 and roughly doubling in twelve months. Google Chrome accounts for approximately 80% of HTTP/3 requests seen by Cloudflare, followed by Microsoft Edge at around 10%, Mozilla Firefox just under 10%, and Apple Safari responsible for the balance. Major search engine indexing bots such as GoogleBot and BingBot still predominantly use older versions of HTTP, while social media platform bots like FacebookBot and TwitterBot have limited or no usage of HTTP/3.