Re: [squid-users] Squid as transparent proxy show squid error pages in browser

Hello, Thank You for your answer. I know that its off topic now, but
can you get me some directions how this can be done?

Thank You

2013/1/10 Eliezer Croitoru <eliezer_at_ngtech.co.il>:
> Hey Franisek,
>
> This is no squid problem.
> since it's intercept proxy the client tries to do a dns lookup for the
> www.example.com but since it dosn't have any way to get the dns result for
> this domain it shows the client the problem it has.
> Firefox dont know to what IP send the requests.
> In this situation the client dont even send a request at all that squid can
> intercept.
>
> Handle this kind of network issues in another level then squid\application.
>
> Regards,
> Eliezer
>
>
> On 1/10/2013 3:11 PM, Frantisek Remias wrote:
>>
>> OK, the problem is that it still show browser default error message
>> like before when the domain cannot be resolved
>>
>> The error message is like
>>
>> "Server not found. Check if the address for typing errors such as
>> ww.example.com of www.example.com" in firefox.
>>
>> I need to show custom page instead of this browser default page when
>> there is no internent connection
>>
>> 2013/1/10 Amos Jeffries <squid3_at_treenet.co.nz>
>>>
>>>
>>> On 10/01/2013 9:38 p.m., Frantisek Remias wrote:
>>>>
>>>>
>>>> Hello,
>>>>
>>>> thank you for the response.
>>>>
>>>> If I set the browser to use proxy a there is temporarily no internet
>>>> connection..then it shows the custom page (the ERR_DNS_FAIL one). BTW:
>>>> Is it possible to define another custom page when the internet
>>>> connection is not available (so it will shows different one when there
>>>> is DNS problem and another if internet connection is unavailable?)
>>>
>>>
>>>
>>> How is Squid to know about connection unavailable? It is not making a
>>> connection, just doing DNS lookup at this point to determine where the
>>> connection might go in future. It is entirely possible (and normal) that
>>> routing make the DNS go through one upstream link and HTTP packets
>>> through
>>> another.
>>>
>>>
>>>> If I dont set the browser to use proxy (meaning it will use
>>>> transparent mode proxy). It shows default browser error message like
>>>> "Internet Explorer cannot display the webpage" or "Server not
>>>> found...Firefox cant found the server at www.".... in firefox. What I
>>>> need is to show the squid custom page in this case there isnt internet
>>>> connection available
>>>
>>>
>>>
>>> Interfaces these days offer scripted hooks. So...
>>>
>>> You configure Squid with:
>>> http_port 3128 intercept name=port1
>>> http_port 3129 intercept name=port2
>>> acl port2 myportname port2
>>> deny_info ERR_CUSTOM port2
>>> http_access deny port2
>>>
>>> Then you make a script which changes the iptables rules sending traffic
>>> to
>>> port #2 of Squid when the link goes down and sending traffic to port #1
>>> of
>>> Squid when it goes up.
>>>
>>> Amos
Received on Thu Jan 10 2013 - 15:46:26 MST