Nginx中$http_host、$host、$proxy_host的区别

变量	是否显示端口	值是否存在
host	否	"Host:value"显示值为a:b的时候，只显示a
http_host	是	"Host:value"，value存在就显示
proxy_host	默认80不显示其他端口显示	"Host:value"显示

通过Nginx配置演示：

[ conf]# cat nginx.conf

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;

    log_format  main  ‘$remote_addr - $remote_user [$time_local] "$request" ‘
                      ‘$status $body_bytes_sent "$http_referer" ‘
                      ‘"$http_user_agent" "$http_x_forwarded_for"‘;

    access_log  logs/access.log  main;

    sendfile        on;
    tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;
#     upstream backend {
#       server 10.0.0.50:8080;
#}

    server {
          listen       80;
          server_name  a.test.com;

    location / {
        proxy_pass http://10.0.0.50:8080;
        proxy_set_header X-Proxy-Host $proxy_host;
        proxy_set_header Host $http_host;
           index index.html index.htm;
       }
}
}

另一台服务器配置

[ conf]# cat nginx.conf

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;

    #log_format  main  ‘$remote_addr - $remote_user [$time_local] "$request" ‘
    #                  ‘$status $body_bytes_sent "$http_referer" ‘
    #                  ‘"$http_user_agent" "$http_x_forwarded_for"‘;

    #access_log  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

    server {
        listen       8080;
        server_name  www.test.com aa.test.com;


        location / {
      return 200 ‘http_host=[$http_host] host=[$host] proxy_host=[$http_x_proxy_host]\n‘;
}
}
}

不携带请求头 Host

[ conf]# curl -H ‘Host:‘ --http1.0 http://a.test.com
http_host=[] host=[www.test.com] proxy_host=[10.0.0.50:8080]

变量	值	说明
http_host		请求无 Host, 则 http_host 为空, 继而无 Host 传到 proxy
host	www.test.com	proxy 无 Host 传入, 则使用其 server_name 的第一项
proxy_host	10.0.0.50:8080	取自于 proxy_pass 的参数

携带请求头 Host

[ conf]# curl -H ‘Host:abc:123‘ --http1.0 http://a.test.com
http_host=[abc:123] host=[abc] proxy_host=[10.0.0.50:8080]

变量	值	说明
http_host	abc:123	给啥拿啥
host	abc	第一个`:`前的内容(小写)
proxy_host	10.0.0.50:8080	带端口显示

修改真实服务器的端口为默认端口

http {
    include       mime.types;
    default_type  application/octet-stream;

    log_format  main  ‘$remote_addr - $remote_user [$time_local] "$request" ‘
                      ‘$status $body_bytes_sent "$http_referer" ‘
                      ‘"$http_user_agent" "$http_x_forwarded_for"‘;

    access_log  logs/access.log  main;

    sendfile        on;
    tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;
#     upstream backend {
#       server 10.0.0.50:8080;
#}

    server {
          listen       80;
          server_name  a.test.com;
        
    location / {
        proxy_pass http://10.0.0.50:80;
        proxy_set_header X-Proxy-Host $proxy_host;
        proxy_set_header Host $http_host;
           index index.html index.htm;
       }
}
}

http {
    include       mime.types;
    default_type  application/octet-stream;

    #log_format  main  ‘$remote_addr - $remote_user [$time_local] "$request" ‘
    #                  ‘$status $body_bytes_sent "$http_referer" ‘
    #                  ‘"$http_user_agent" "$http_x_forwarded_for"‘;

    #access_log  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

    server {
        listen       80;
        server_name www.test.com aa.test.com;


        location / {
      return 200 ‘http_host=[$http_host] host=[$host] proxy_host=[$http_x_proxy_host]\n‘;
}
}
}

访问时proxy_host会省略80端口

[ conf]# curl -H ‘Host:abc:123‘ --http1.0 http://a.test.com
http_host=[abc:123] host=[abc] proxy_host=[10.0.0.50]

Nginx中$http_host、$host、$proxy_host的区别

不携带请求头 Host

携带请求头 Host

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