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/usr/local/nginx/conf/vhosts/yum.qr.cntv.net.conf

server{     listen 80;     server_name yum.qr.cntv.net;     index index.html index.htm index.php;     root /data/www/yum.qr.cntv.net;     autoindex on;     autoindex_exact_size off;     autoindex_localtime on;     etag off;     location = / {                 #etag off;    #放这儿不行                                     autoindex on;     }     access_log on;     access_log /data/logs/nginx/yum_access.log main;     error_log /data/logs/nginx/yum_error.log warn; }

关闭前：
Connection: keep-alive
Content-Encoding: gzip
Content-Type: text/xml
Date: Wed, 18 Sep 2019 02:23:28 GMT
ETag: W/"5d80ad08-bb9" 【】
ip_network: 234.253
Last-Modified: Tue, 17 Sep 2019 09:53:12 GMT
Server: nginx
Transfer-Encoding: chunked
Vary: Accept-Encoding

关闭后：
http://yum.qr.cntv.net/centos/6/x86_64/repodata/repomd.xml
Connection: keep-alive
Content-Encoding: gzip
Content-Type: text/xml
Date: Wed, 18 Sep 2019 02:18:51 GMT
ip_network: 234.254
Last-Modified: Tue, 17 Sep 2019 09:53:12 GMT
Server: nginx
Transfer-Encoding: chunked
Vary: Accept-Encoding


来自：http://nginx.org/en/docs/http/ngx_http_core_module.html
Syntax:  etag on | off;
Default:  
etag on;
Context:  http, server, location
This directive appeared in version 1.3.3.


二）关闭 if_modified_since off;的方法。
默认是开启的

可以参考两个方案(实践没有成功)

第一在nginx.conf里设置

if_modified_since off|on;
第二在具体的location段里

location ~* \.(?:manifest|appcache|html?|xml|json)$ {
# add_header  Last-Modified $date_gmt;
  # add_header  Last-Modified ""; #不想要就置空
# add_header  Cache-Control "public";
}
PS:$date_gmt是内嵌变量，具体参考ngx_http_ssi_module模块

nginx如果打开了SSI模块，会默认关闭header中的last-modified输出
https://blog.csdn.net/weixin_34168700/article/details/92438695

作者：jackxiang@向东博客 专注WEB应用 构架之美 --- 构架之美，在于尽态极妍 | 应用之美，在于药到病除
地址：https://jackxiang.com/post/10295/
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