Product Content

What is HTTP/2?

• HTTP/2 (Hypertext Transfer Protocol Version 2) is a major revision of the HTTP network protocol used by the World Wide Web.
• HTTP/2 is designed to address the performance issues in HTTP1.X to make better use of network resources and reduce network application latency.
• HTTP/2 is backward compatible with HTTP1.X.

Why should HTTP/2 be used?

Compared with HTTP1.X, HTTP/2 can make a response faster and more efficiently. It features the following advantages:

• Multiplex: Concurrent processing leads to a faster response.
• Server push: The server proactively pushes resources needed by the client, reducing the number of requests.
• More features include traffic control, request priority, header compression, and binary framing.

Product Purchase

How does the billing work?

CLB supports the HTTP/2 protocol by default with no extra fees charged.

Product Implementation

How to enable HTTP/2 on CLB?

The listener supports HTTP/2 on HTTPS by default with no additional configuration required.
During the handshake process of HTTPS, the protocol version will be negotiated. The client uses ALPN (Application-Layer Protocol Negotiation) to inform the server of a list of supported protocols. The server selects HTTP/2 or HTTP1.X according to the protocol list. It is automatically backward compatible with no additional configuration required.

1. Plaintext HTTP/2 is not supported. Mainstream browsers and web servers only support TLS-based HTTP/2 protocol.
2. The HTTP1.X protocol is still used between CLB and real server.

Which regions support HTTP/2?

HTTP/2 is supported in regions such as Beijing, Shanghai, Guangzhou, Hong Kong (China), Silicon Valley, Frankfurt and Mumbai.