Can I implements http/2 server without ALPN support?
问题 In this way, the client can connect the server without ALPN and use http/2 default. Is that possible？ 回答1: Yes it is possible, but the conditions are strict. Browsers, as of now, do not implement clear-text communication for HTTP/2, so if you use a browser the answer to your question is no: you have to deploy your server with ALPN support if you want browsers to be able to connect. On the other hand, other clients such as Java clients may be able to connect to a server using clear-text HTTP/2