第 7 期 2018-05-24 線下活動 - Go 標準包閱讀

文章來自於：https://reading.developerlearning.cn/reading/7-2018-05-24-net-http-part1/

視訊回看

Go 標準包閱讀

Go 版本：go 1.10.1

net/http

• server.go

問題

1. Next Protocol Negotiation = NPN
2. Expect 100 Continue support

見參考資料

1. header 提到了：Expect 和 host
2. 判斷了 header 裡面的 HOST，但是後面又刪除，為什麼？

server.go#L980

delete(req.Header, "Host")

1. 判斷是否支援 HTTP2 （isH2Upgrade）

// isH2Upgrade reports whether r represents the http2 "client preface"
// magic string.
func (r *Request) isH2Upgrade() bool {
    return r.Method == "PRI" && len(r.Header) == 0 && r.URL.Path == "*" && r.Proto == "HTTP/2.0"
}

呼叫：ProtoAtLeast(1, 1)
...
// ProtoAtLeast reports whether the HTTP protocol used
// in the request is at least major.minor.
func (r *Request) ProtoAtLeast(major, minor int) bool {
    return r.ProtoMajor > major ||
        r.ProtoMajor == major && r.ProtoMinor >= minor
}

延伸閱讀

1. https://github.com/golang/go/issues/22128
2. https://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-26#section-6.2.1
3. https://www.cnblogs.com/tekkaman/archive/2013/04/03/2997781.html
4. https://benramsey.com/blog/2008/04/http-status-100-continue/
5. http://www.ituring.com.cn/article/130844

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