HTTP2 期望流按照顺序打开

Question

我在官方 HTTP2 规范中没有看到这种说法，但似乎如果您打开 ID 不代表序列号的流，服务器会以包含 ProtocolError 作为原因的 GoAway 帧进行响应。

示例（无效）：

=> HEADER{sid: 3}
=> HEADER{sid: 1}
<= GoAway{ProtoclError}

示例（有效）：

=> HEADER{sid: 1}
=> HEADER{sid: 3}
<= ... All good ...

这是为什么？有人可以指出规范中的正确部分吗，pelase？

Answer 1

这在 [HTTP/2 规范第 5.1.1 节] 中有说明：(https://datatracker.ietf.org/doc/html/rfc7540#section-5.1.1)

The identifier of a newly established stream MUST be numerically greater than all streams that the initiating endpoint has opened or reserved.
...
An endpoint that receives an unexpected stream identifier MUST respond with a connection error (Section 5.4.1) of type PROTOCOL_ERROR.

HTTP2 期望流按照顺序打开

HTTP2 expects streams to be opened following the sequence

protocols

http2