Re: mod_ratelimit working by steps ?

[nerbrume@xxxxxxx]

Hi,

> I created a 4MB file and rate limited its directory container in the
> httpd's conf, and tested 8/20/30/etc.. settings as you suggested with
> curl:
>
> curl http://localhost/test.txt > /dev/null (in this way I drop the
> returned response but keep the curl's connection metadata summary).
>
> In every case I get the expected result (average Dload speed).

Thanks a bunch for testing this, and confirming that something is wrong 
on my side.
After more test, I'm pretty sure the problem come from a bad interaction 
between mod_ratelimit and mod_proxy.
(sorry, I forgot to mention that the path I was trying to rate-limit is 
indeed a tomcat app behind mod_proxy).

> Did you execute your performance tests in localhost? And also, did you
> use another tool other than Firefox? I'd be curious to know your
> results with curl executed in localhost.

I've tried the following (Excerpts from my config at the end of this 
mail):

0) rate-limit on tomcat app proxified throught mod_proxy (previous mail)
   => rate-limit works by step, and does not limit anything if 
rate-limit > 40
   (tried on local with wget)
1) rate-limit on a true folder, served by apache :
   => rate-limit is working as expected
2) rate-limit on file served through python's SimpleHttpServer, 
proxified by mod_proxy
   => rate-limit works by step.

In conclusion, tomcat is not at fault, since python's SimpleHttpServer 
also have a problem, and the trouble come from my reverse-proxy.
In the case af a reverse proxy, I'm not sure which part of the 
connection get rate-limited ?
Is that an known problem ?
Or am I trying to do something totally bogus here ?
Any ideas to achieve my goal ? (that is, limiting the bandwith used by 
the tomcat app)

Thanks!

N

PS : for what it's worth, I've tried 1) with curl, and got the following 
error, wich seems to be related to the use of http2:
curl: (56) Unexpected EOF
wget is fine, though.

PS2 : Excerpts from my config
    <Proxy *>
        Order deny,allow
        Allow from all
    </Proxy>
    SSLProxyEngine      On
    SSLProxyCheckPeerCN Off
    SSLProxyCheckPeerName Off
    <Location /airsonic> # the tomcat app
        ProxyPreserveHost   On
        ProxyPass http://127.0.0.1:12345/airsonic
        ProxyPassReverse http://127.0.0.1:12345/airsonic
        SetOutputFilter RATE_LIMIT
        SetEnv rate-limit 35
   </Location>
    <Location /test> # a true folder, served by apache
        SetOutputFilter RATE_LIMIT
        SetEnv rate-limit 50
   </Location>
    <Location /test2> # a python SimpleHttpServer
        ProxyPreserveHost   On
        ProxyPass http://127.0.0.1:8000
        ProxyPassReverse http://127.0.0.1:8000
        SetOutputFilter RATE_LIMIT
        SetEnv
   </Location>

> Thanks!
>
> Luca
>
> Links:
> ------
> [1]
> https://webmasters.stackexchange.com/questions/101988/strange-behaviour-with-apache-mod-ratelimit

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