是否存在HTTP2请求/响应对应的语言语法规范？

Great question! You’re right to seek out an equivalent specification to HTTP 1.1’s 1999 RFC 2616 for HTTP/2—here’s a clear breakdown:

核心规范：RFC 7540 #

HTTP/2’s official, comprehensive specification is RFC 7540, released in May 2015. Unlike HTTP 1.1’s text-based syntax, HTTP/2 operates on a binary framing layer, so its "grammar" centers around structured binary frames rather than human-readable plaintext lines. This RFC covers all critical details for HTTP/2 requests and responses, including:

• The binary frame format that wraps request/response metadata and payloads
• How familiar HTTP concepts (methods, status codes, headers) are adapted to the binary protocol
• Rules for multiplexing multiple requests/responses over a single connection
• Header compression mechanics via HPACK (defined alongside in RFC 7541)

关于 HTTP 1.1 的快速补充 #

As a quick side note: The 1999 RFC 2616 you referenced has been officially obsoleted. The modern HTTP 1.1 specification is split across RFCs 7230–7235, which clarify and update the original standard. But that’s a tangent—back to your main question!

关键语法差异 vs HTTP 1.1 #

Since HTTP/2 uses binary framing, its syntax looks very different from HTTP 1.1’s plaintext structure:

• Requests and responses are split into distinct frame types (e.g., HEADERS frames for request/response metadata, DATA frames for content payloads)
• Headers are compressed to minimize overhead, so they aren’t sent as raw text strings
• Multiple requests and responses can be processed concurrently over a single TCP connection, thanks to multiplexing

内容的提问来源于stack exchange，提问作者Lance Pollard