nginx是否支持将请求压缩到上游？

Question

Dose nginx supprt this ? Whoul you please show me some configuration of it?

[Client]           [Nginx Reverse Proxy]               [BackEnd]
   |   [Raw Post]         |    [gzip encoded request]     |   
   |--------------------> | ----------------------------->|
   |                      |                               |  
   |   [Raw Response]     |    [gzip encoded response]    |
   | <------------------  | <-----------------------------|
   |                      |                               |

Answer 1

Apparently there is some way to do this. Nginx has a gunzip module that gzip decompresses responses:

The ngx_http_gunzip_module module is a filter that decompresses responses with “Content-Encoding: gzip” for clients that do not support “gzip” encoding method. The module will be useful when it is desirable to store data compressed, to save space and reduce I/O costs.

This module is not built by default, it should be enabled with the --with-http_gunzip_module configuration parameter.

Source: http://nginx.org/en/docs/http/ngx_http_gunzip_module.html

Then you can use it like:

gunzip on;

Hope that works for you.

Also see this SO question: Is there sort of unzip modules in nginx?

Answer 2

The full and correct answer is that nginx can do this, but with a couple of caveats. In order to provide an uncompressed response to the edge client (user PC), you must compile nginx with the gunzip module - which isn't built/included by default. This is the opposite of the gzip module, and allows nginx to unzip already-compressed resources found on disk or obtained from a backend server.

So when compiling nginx, include this: --with-http_gunzip_module

And in your nginx.conf , you'll have a block like this to describe requests to be obtained from a backend server:

    location @backend {
        ...
        proxy_pass http://10.0.0.xxx;
        gunzip on;
        proxy_set_header Accept-Encoding "gzip";
    }

Answer 3

You can turn off gzip compression in nginx by setting the gzip directive to off in your nginx.conf :

gzip off

Additionally you can turn of gzip compression for proxied requests only:

gzip_proxied off

Nginx has a great wiki where all this information is clearly explained: http://wiki.nginx.org/HttpGzipModule

About nginx proxying: also clearly described in the nginx wiki:

Example:

 location / { proxy_pass http://localhost:8000; proxy_set_header X-Real-IP $remote_addr; } 

http://wiki.nginx.org/HttpProxyModule

There are many different ways to set up a proxy so you should dive in and see what you need exactly, there's no 'one' answer to this.