nginx with data compression on java applet

[hirantha]

Thanks guys for the replies..


Igor Sysoev wrote:
> On Sat, Mar 14, 2009 at 02:11:38AM +0530, hirantha wrote:
> 
>> Hi ALL,
>>
>> I am very new to nginx, and I found the nginx is the perfect tool for me 
>> to do reverse-proxy while compressing the data. I have successfully 
>> configured the proxy_pass and gzip configurations and it is working as I 
>> expected in test environments.
>>
>> We have web servers which streaming text data through java applet to the 
>> end users. Nginx is act as a reverse-proxy for back-end web servers; 
>> once the java applet loaded on the FireFox or IE browser it keep 
>> receiving data without any issue. But the problem is those text data 
>> won't get compressed though text, images etc loaded to the browser get 
>> compressed. I can compress data off the applet but once it send it to 
>> java applet, won't get compressed.
> 
> It seems that java applet does not send the "Accept-Encoding: gzip"
> request header.

I ran Wireshark to analyze the data on java applet and firefox browser to check what type of header 
request they send. Here are my findings.

 From browser:
GET /mbr/ds.aspx?SID=1F5AAWQWQWSA1 HTTP/1.1
Host: data.example.com
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.7) Gecko/2009030503 Fedora/3.0.7-1.fc10 
Firefox/3.0.7
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive


 From Java applet loaded from Firefox:
GET /sabb/GetUserParams.aspx?Y=BC672 HTTP/1.1
User-Agent: Java(tm) 2 SDK, Standard Edition v1.6.0_0 Java/1.6.0_0
Host: data.example.com
Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
Connection: keep-alive

I think java applet don't sends Accept-Encoding header to the server; and this should be the 
problem. I am not a java expert and the new question, is this possible with a java applet set 
Accept-Encoding request header...?

> 
> BTW why do you compress image/gif image/jpeg image/png ?
> This is just waste of CPU time.

Yes, I have to avoid them, my concern is huge text data.

Any advice on the new question is really appreciated.


Regards
Hirantha
> 
>> Here is my nginx.conf:
>>
>> http {
>>    include       mime.types;
>>    default_type  application/octet-stream;
>>    sendfile        on;
>>    keepalive_timeout  65;
>> # compression
>>    gzip on;
>>    gzip_http_version 1.0;
>>    gzip_comp_level 4;
>>    gzip_proxied private;
>>    gzip_min_length  1100;
>>    gzip_buffers 16 8k;
>>    gzip_types text/plain text/html text/css application/x-javascript \
>>        text/xml application/xml application/xml+rss text/javascript \
>>        image/gif image/jpeg image/png;
>>    gzip_disable "MSIE [1-6].(?!.*SV1)";
>>    gzip_vary on;
>>    server {
>>        listen       80;
>>        server_name  localhost;
>>
>>
>>    location / {
>>        proxy_pass         http://data.example.com/;
>>        proxy_redirect     off;
>>
>>        proxy_set_header   Host             $host;
>>        proxy_set_header   X-Real-IP        $remote_addr;
>>        proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
>>        proxy_max_temp_file_size 0;
>>
>>        client_max_body_size       10m;
>>        client_body_buffer_size    128k;
>>
>>        proxy_connect_timeout      90;
>>        proxy_send_timeout         90;
>>        proxy_read_timeout         90;
>>
>>        proxy_buffer_size          4k;
>>        proxy_buffers              4 32k;
>>        proxy_busy_buffers_size    64k;
>>        proxy_temp_file_write_size 64k;
>>
>>        }
>>        error_page   500 502 503 504  /50x.html;
>>        location = /50x.html {
>>            root   /usr/local/www/nginx-dist;
>>        }
>>
>>    }
>>
>>
>> I'm Running on FreeBSD7.1 and I googled such scenario but no luck. To 
>> get this done where do I have to looking in to..? Any advice is really 
>> appreciated
>>
>> Thanks in advance
>> Hirantha
>