curl -I baidu.com #查询web服务器版本
1.vim /src/core/nginx.h
#define nginx_version 1013009
#define NGINX_VERSION "1.13.9"
#define NGINX_VER "nginx/" NGINX_VERSION
2.vim /src/http/ngx_http_header_filter_module
static u_char ngx_http_server_string[] = "Server: nginx" CRLF;
3.vim /src/http/ngx_http_special_response.c
"<hr><center>nginx</center>" CRLF