修改nginx默认头版本信息

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默认的版本信息一般会暴露服务器所使用的开源软件、版本、可能被恶意引用导致不必要的麻烦，因此有时候可以做一些调整，禁止或者改变默认头信息。
修改前修改：

[go@centos7 ~]$ curl --head home.baidu.com
HTTP/1.1 200 OK
Date: Sun, 20 Mar 2016 04:55:32 GMT
Server: Apache/2.2.31 (Unix)
Last-Modified: Sat, 19 Mar 2016 11:30:18 GMT
ETag: "ea071e-259b-52e6530272680"
Accept-Ranges: bytes
Content-Length: 9627
Connection: close
Content-Type: text/html

[go@centos7 ~]$ curl --head home.baidu.com

HTTP/1.1 200 OK

Date: Sun, 20 Mar 2016 04:55:32 GMT

Server: Apache/2.2.31 (Unix)

Last-Modified: Sat, 19 Mar 2016 11:30:18 GMT

ETag: "ea071e-259b-52e6530272680"

Accept-Ranges: bytes

Content-Length: 9627

Connection: close

Content-Type: text/html

修改后：

[go@centos ~]$ curl --head home.baidu.com     
HTTP/1.1 200 OK
Server: Byrd
Date: Sun, 20 Mar 2016 04:56:39 GMT
Content-Type: text/html
Content-Length: 69
Last-Modified: Sun, 21 Feb 2016 13:58:39 GMT
Connection: keep-alive
ETag: "56c9c28f-45"
Accept-Ranges: bytes

[go@centos ~]$ curl --head home.baidu.com

HTTP/1.1 200 OK

Server: Byrd

Date: Sun, 20 Mar 2016 04:56:39 GMT

Content-Type: text/html

Content-Length: 69

Last-Modified: Sun, 21 Feb 2016 13:58:39 GMT

Connection: keep-alive

ETag: "56c9c28f-45"

Accept-Ranges: bytes

修改代码：

[root@centos nginx-1.6.3]# grep Byrd . -r
./src/http/ngx_http_special_response.c:"<hr><center>Byrd</center>" CRLF
./src/http/ngx_http_header_filter_module.c:static char ngx_http_server_string[] = "Server: Byrd" CRLF;
./src/core/nginx.h:#define NGINX_VER          "Byrd/" NGINX_VERSION