HTTP/2 Frames

HTTP/1.x messages 缺点

HTTP/1.x messages have a few drawbacks for performance:

  • Headers, unlike bodies, are uncompressed.
  • Headers are often very similar from one message to the next one, yet still repeated across connections.
  • No multiplexing can be done. Several connections need opening on the same server: and warm TCP connections are more efficient than cold ones.

HTTP/2 Frames

HTTP/2 introduces an extra step: it divides HTTP/1.x messages into frames which are embedded in a stream. Data and header frames are separated, this allows header compression. Several streams can be combined together, a process called multiplexing, allowing more efficient underlying TCP connections.

Binary_framing2.png

参考

MDN: HTTP Messages

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