1 Introduction
The ngx_http_sub_module nginx module, may be used to modify the contents of the string in response to the site, such as filtration sensitive words. Third-party modules ngx_http_substitutions_filter_module, to make up for the lack of ngx_http_sub_module, you can replace the use of regular expressions.
2.安装ngx_http_sub_module
- Check whether the installation module to change
with thenginx -Vview, if it contains http_sub_module support, or not support.
FIG is supported, it can be used directly, if the installation does not need to be recompiled Nginx support, translation parameters module coupled to -with-http_sub_module
3. Instructions
subs_filter_types
subs_filter_types
语法： subs_filter_types mime-type [mime-types]
默认：subs_filter_types text/html （高版本的nginx如果有写着条，那么重启服务的时候会有警告信息，因为默认就是检查 text/html的信息，与程序有重复配置）
适用区域：http, server, location
subs_filter_types是用来指令需要替换的文件类型，默认是text/html类型。* 表示所有类型。
此模块无法处理经过压缩的内容，虽然能与gzip filter模块兼容，但无法处理反向代理返回的内容。当需要处理反向代理的内容时，可以使用如下语句禁用压缩：
proxy_set_header Accept-Encoding '';
subs_filter
subs_filter
语法;subs_filter 源字段串 目标字段串 [gior]
默认:无
适用区域：http, server, location
subs_filter指令允许在nginx响应输出内容时替换源字段串（正则或固定）为目标字符串。第三个标志含意如下：
g(默认): 替换所有匹配的字段串。（默认可省略）
i: 执行区分大小写的匹配。
o: 仅替换首个匹配字符串。
r: 使用正则替换模式，默认是固定模式。
4. Example Configuration
The main purposes of this example:
- Replace the specified phone number for our phone number request
- All requests in the address of the page are replaced with a request to go Nginx address (HTML, there are many resources to address file, AJAVX request address must be replaced with the address of the current NGINX's go)
Note:
The above configuration means that the http: // IP: 9090 / travel / hotel / getReview / xxxx forward to http://m.elong.com/hotel/XXXX
URI will replace the location of the matching portion of the URI
5. Hang
- Disable compression (phenomenon: web return data is not replaced, CURL returned successfully replace)
all the time Nginx Anti-generation common problem is sub_filter invalid. Because the browser is allowed compression, the request is the first band Accept-Encoding: gzip's. And the Nginx sub_filter can not handle compressed request, Nginx itself will not be unpacked. In fact, in order to write a decompression plug-in it is not possible, because there is no input filtering Nginx relevant interface.
General online solutions are proxy_set_header Accept-Encoding ""; upstream disable compression, the compression is not affected client side. - By default only replace HTML, you want to replace the use of all types *
6. References
