nginx 自定义 Server Name 隐藏软件名 自定义版本

package main

import (
    "fmt"
    "golang.org/x/net/http2/hpack"
)

func main() {
    fmt.Println("nginx", "→", Encode("ithothub"))
    fmt.Println("nginx", "→", Encode("nginx"))
    fmt.Println("apache", "→", Encode("apache"))
}

func Encode(s string) string {
    var result string

    hd := hpack.AppendHuffmanString(nil, s)
    hl := hpack.HuffmanEncodeLength(s) | 0x80

    result += RenderByte(byte(hl))

    for _, b := range hd {
        result += RenderByte(b)
    }

    return result
}

func Decode(s string) string {
    data := []byte(s)
    result, _ := hpack.HuffmanDecodeToString(data[1:])
    return result
}

func RenderByte(b byte) string {
    return fmt.Sprintf("\\x%x", b)
}