Re: [squid-users] Detecting proxy server

Thank you Alex. This is helpful.

Sent from my iPhone

> On 07-Jul-2014, at 8:15 pm, Alex Rousskov <rousskov_at_measurement-factory.com> wrote:
>
>> On 07/07/2014 06:58 AM, Vinay C wrote:
>>
>> Is there any way I can detect which Proxy server (Preferably name like
>> Squid, Websense etc) did my http-request passes through (Either at
>> webserver side or at request initiating client side)?
>
>
> If the proxy adds a Via header identifying the proxy product name, then
> you can easily identify such a proxy by looking at the request or
> response forwarded by the proxy. FWIW, Squid adds a Via header with
> Squid name by default.
>
> If the proxy does not add a Via header, then it may still be possible to
> detect and identify it, especially if you control both the client and
> the origin server. However, detection and especially identification in
> such environment may require sending probing messages and using
> imprecise AI techniques "fingerprint" proxy behavior. Your program would
> then search for that fingerprint in the fingerprint database of known
> proxies. I am not aware of any such ready-to-use programs or databases,
> but they may exist.
>
> Please note that a single message may pass through several proxies,
> complicating the matters further.
>
> The above applies to regular forwarding, reverse, and so called
> "transparent" HTTP proxies as well as their combination.
>
>
> HTH,
>
> Alex.
>
Received on Mon Jul 07 2014 - 15:58:32 MDT