Hi Zhu,
I tried taobao's module and it works like a charm if nginx is configured as a web server:
server {
listen 80;
server_name localhost;

location / {
footer "<!-- $date_gmt -->";
index index.html;
}
}
The result is a html comment with a gmt date like <!-- 1234567890 --> added to the end of the response body.
But if configured like a reverse proxy it does not add the comment.
server { listen 80; server_name localhost;
location / { proxy_pass http://127.0.0.1:8080/;
footer "<!-- $date_gmt -->"; }}
Well, this simple nginx location configuration points the traffic to a upstream web server. As expected, on return I don't get the nginx's default index.html, but the upstream html page instead, with the difference that the comment <!-- 1234567890 --> is not added.
I'm pretty sure I'm missing something here. I'm starting to believe that if I want to write to a response body served by a upstream server a filter may not be the answer.
I've tried evanmiller.org guide and I found the section "3.2. Anatomy of an Upstream (a.k.a Proxy) Handler" (http://www.evanmiller.org/nginx-modules-guide.html#proxying) and I have the impression that this might help me finding the answer, but I'm failing to reproduce the example because at the moment I'm not as familiar with the guts of an handler as I am with a filter.
Anyway, I don't even know if an handler will do the trick. So any help is welcome :)
Thank you.

Date: Sat, 22 Sep 2012 01:45:40 +0800
Subject: Re: nginx filter to concat text to a response body
From: zhuzhaoyuan@gmail.com
To: nginx-devel@nginx.org

Hi Filipe,

On Sat, Sep 22, 2012 at 12:01 AM, Filipe Silva <fs20063@outlook.com> wrote:




Hello,
I've been trying to produce a nginx filter to concat text to a response body but without success.

An important detail is that it works with a nginx configured as a web server but not with a nginx server configured as reverse proxy.

Should I be using an handler instead?
Is this what you are looking for?
https://github.com/taobao/nginx-http-footer-filter
Regards,
--
Joshua Zhu
Senior Software Engineer

Server Platforms Team at Taobao


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