先来看下proxy_set_header的语法
语法: | proxy_set_header |
默认值: |
proxy_set_header Host $proxy_host; proxy_set_header Connection close; |
上下文: |
http , server , location
|
允许重新定义或者添加发往后端服务器的请求头。value
可以包含文本、变量或者它们的组合。 当且仅当当前配置级别中没有定义proxy_set_header
指令时,会从上面的级别继承配置。 默认情况下,只有两个请求头会被重新定义:
proxy_set_header Host $proxy_host; proxy_set_header Connection close;
nginx对于upstream默认使用的是基于IP的转发,因此对于以下配置:
upstream backend { server 127.0.0.1:8080; } upstream crmtest { server crmtest.aty.sohuno.com; } server { listen 80; server_name chuan.aty.sohuno.com; proxy_set_header Host $http_host; proxy_set_header x-forwarded-for $remote_addr; proxy_buffer_size 64k; proxy_buffers 32 64k; charset utf-8; access_log logs/host.access.log main; location = /50x.html { root html; } location / { proxy_pass backend ; } location = /customer/straightcustomer/download { proxy_pass http://crmtest; proxy_set_header Host $proxy_host; } }
当匹配到/customer/straightcustomer/download时,使用crmtest处理,到upstream就匹配到crmtest.aty.sohuno.com,这里直接转换成IP进行转发了。假如crmtest.aty.sohuno.com是在另一台nginx下配置的,ip为10.22.10.116,则$proxy_host则对应为10.22.10.116。此时相当于设置了Host为10.22.10.116。如果想让Host是crmtest.aty.sohuno.com,则进行如下设置:
proxy_set_header Host crmtest.aty.sohuno.com;
如果不想改变请求头“Host”的值,可以这样来设置:
proxy_set_header Host $http_host;
但是,如果客户端请求头中没有携带这个头部,那么传递到后端服务器的请求也不含这个头部。 这种情况下,更好的方式是使用$host
变量——它的值在请求包含“Host”请求头时为“Host”字段的值,在请求未携带“Host”请求头时为虚拟主机的主域名:
proxy_set_header Host $host;
此外,服务器名可以和后端服务器的端口一起传送:
proxy_set_header Host $host:$proxy_port;
如果某个请求头的值为空,那么这个请求头将不会传送给后端服务器:
proxy_set_header Accept-Encoding "";
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