nginx 自定义 Server Name 隐藏软件名 自定义版本

How To Customize Your Nginx Server Name

• src/core/nginx.h
  #define NGINX_VER "MYWS/“ NGINX_VERSION
• http/ngx_http_special_response.c
  "

  ---

  MYWS” CRLF
• http/ngx_http_header_filter_module.c
  static u_char ngx_http_server_string[] = "Server: MYWS" CRLF;
• src/http/v2/ngx_http_v2_filter_module.c
  static const u_char nginx[5] = "\x84\xd1\xcf\x96\xef";

第4点是为http2 做的修改.
字节码生成:

package main

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

func main() {
    fmt.Println("nginx", "→", Encode("MYWS"))
    fmt.Println("nginx", "→", Encode("nginx"))
    fmt.Println("apache", "→", Encode("apache"))
    fmt.Println("-----")
    fmt.Println("\\x84\\xaa\\x63\\x55\\xe7", "→", Decode("\x84\xaa\x63\x55\xe7"))
    fmt.Println("\\x84\\x1d\\x63\\x24\\xe5", "→", Decode("\x84\x1d\x63\x24\xe5"))
}

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)
}

参考 https://stackoverflow.com/questions/35655448/how-does-this-code-result-in-the-string-nginx