Re: [squid-users] Re: Squid Issues and Problems

We are affected by this problem, IWSS is telling:
2008/07/30 11:05:35 GMT-03:00 <18297:19575> WARNING: X-TE trailers
not found, ICAP client does NOT support trickling for this type of
transaction

When trying to download a large file. Is there any plan on making a
modification on Squid for this to work? Or is something Trendmicro
will need to modify?

Thanks

On Mon, Jul 7, 2008 at 2:07 PM, Henrik Nordstrom
<henrik_at_henriknordstrom.net> wrote:
> It's Trend Micro way of telling the ICAP server (IWSS) that the ICAP
> client (the proxy) is capable of forwarding the response from the ICAP
> server before the entire object has been sent to the ICAP Server.
>
> Most others assume this by default without requiring the private "X-TE:
> trailers" header.
>
> The ICAP standard do not cover explicit how ICAP clients should behave
> in this regard.
>
> This is used by IWSS both for showing a download progress bar, and also
> in trickle mode where the data is slowly sent to the requestor while
> scanned for viruses.
>
> I do not know who proposed the "X-TE: trailers" name. It's a very odd
> name for the feature as it
>
> a) Does not have anything to do with transfer encoding (TE)
>
> b) Does not have anything to do with trailers.
>
> But with it being an X-* header it's free to mean anyting implementation
> specific, as long as everyone involved privately agrees on what the
> meaning actually is...
>
>
> Regards
> Henrik
>
>
>
> On mån, 2008-07-07 at 11:01 -0400, Jeremy Hall wrote:
>> What do X-TE headers do?
>>
>> _J
>>
>> >>> <jerome_law_at_trendmicro.co.uk> 7/7/2008 5:28 AM >>>
>> Hi there all,
>>
>> Firstly many thanks for all your work on Squid thus far :)
>>
>> I have been testing Squid 3.0 since PRE6 in various configurations, and one
>> of the more notable issues I have found is that when Squid is running in
>> ICAP mode, coupled with Trend Micro IWSx (InterScan Web Security) - IWSx
>> reports that Squid does not support the X-TE trailers for data trickling.
>> The error is usually logged when dealing with video from CNN (at first I
>> thought all flash video, but YouTube is unaffected) and downloading certain
>> MS Hotfixes. There might be other triggers as well - but these seem to be
>> the main ones. When I configure IWSx to use a different ICAP server - say
>> NetCache or other, there is no issue or error logged and things work as
>> expected.
>>
>> A quick search of the squid source provided no answers, however a search of
>> the archives show that there was a patch for Squid 2.5 ICAP dealing with
>> X-TE trailers:
>>
>> http://www.squid-cache.org/mail-archive/squid-dev/200311/att-0018/squid-icap
>> -2_5-x-auth-user.diff
>> http://www.squid-cache.org/~hno/changesets/squid/patches/7972.patch <http://www.squid-cache.org/%7Ehno/changesets/squid/patches/7972.patch>
>>
>> Looking at ICAPModXact.cc I can see that there are some similar references
>> to the area's above, however most certainly the code is above my level of
>> expertise to have a play around with to cobble something together.
>>
>> I was wondering if there were any plans to include support for X-TE trailers
>> in this version? If you could let me know that would be greatly appreciated.
>>
>> Best Regards,
>>
>> Jerome
>>
>>
>>
>> <http://websecurity.trendmicro.com/>
>>
>>
>>
>> Jerome Law | Solutions Architect, Regional Marketing EMEA
>>
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>>
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>>
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>>
>> <http://feeds.feedburner.com/~r/Anti-MalwareBlog/~6/2>
>>
>>
>>
>>
>>
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Received on Wed Jul 30 2008 - 14:57:08 MDT