Mainly involves 3 files, nginx.h, ngx_http_header_filter_module.c and ngx_http_special_response.c
scr/core/nginx.conf
#define NGINX_VERSION "1.12.2"
#define NGINX_VER "nginx/" NGINX_VERSION
changed to
#define NGINX_VERSION "1.12.2"
#define NGINX_VER "quexing/" NGINX_VERSION
src/http/ngx_http_header_filter_module.c
static char ngx_http_server_string[] = "Server: nginx" CRLF;
changed to
static char ngx_http_server_string[] = "Server: quexing" CRLF;
src/http/ngx_http_special_response.c
static u_char ngx_http_error_tail[] =
"<hr><center>nginx</center>" CRLF
"</body>" CRLF
"</html>" CRLF
changed to
static u_char ngx_http_error_tail[] =
"<hr><center>quexing</center>" CRLF
"</body>" CRLF
"</html>" CRLF