Re: [squid-users] Did Anyone used ESI with squid ?

Michal Pietrusinski Thu, 10 Mar 2005 08:49:09 -0800

Nitesh,

I looked at the ESI specification and it says nothing about "set_rediredt" - it seems that "set_redirect" is an Akamai extension.

I looked at the source code of squid and found support only for the variables from the ESI specification:


from ESIVarState.cc:
    addVariable ("HTTP_ACCEPT_LANGUAGE", 20, new ESIVariableLanguage);
    addVariable ("HTTP_COOKIE", 11, new ESIVariableCookie);
    addVariable ("HTTP_HOST", 9, new ESIVariableHost);
    addVariable ("HTTP_REFERER", 12, new ESIVariableReferer);
    addVariable ("HTTP_USER_AGENT", 15, new ESIVariableUserAgent(*this));
    addVariable ("QUERY_STRING", 12, new ESIVariableQuery(uri));


Regards,
Michal

Nitesh Naik napisaÅ(a):

Michal,

Here is ESI code that I used .

<table>
<tr>
<td colspan="2">
<esi:try>
<esi:attempt>
<esi:include src="http://www.yahoo.com"/>
</esi:attempt>
<esi:except>
<!--esi This spot is reserved for your company.s advertising. For more info
<a href="www.yahoo.com"> click here </a> -->
</esi:except>
</esi:try>
</td> </tr>
</table>
<esi:assign name="date_string" value="This is test"/>
<esi:vars> $(date_string) </esi:vars>


In access log of squid I get following error.

1110289050.099      0 255.255.255.255 TCP_DENIED/403 0 GET
http://www.yahoo.com - NONE/- text/html

Enabled access to all in squid.conf now I am getting following error.

1110351386.705    541 255.255.255.255 TCP_MISS/403 0 GET
http://www.yahoo.com - ANY_PARENT/<originserver> text/html


Is <esi:vars>$set_redirect('http://www.yahoo.com')</esi:vars> works for you
?

Regards
Nitesh Naik

----- Original Message ----- From: "Michal Pietrusinski" <[EMAIL PROTECTED]> To: "Nitesh Naik" <[EMAIL PROTECTED]> Cc: <squid-users@squid-cache.org> Sent: Tuesday, March 08, 2005 8:34 PM Subject: Re: [squid-users] Did Anyone used ESI with squid ?

Hi Nitesh,

I don't know if squid supports all ESI tags. I try to use only the basic
<esi:include> tag and have problems.

Could you, please, check, if <esi:include> works with your installation?

If it works fine, you should see the page properly composed, and in the
squid_installation/var/logs/access.log there should be entries, that the
template and included pages where taken from the cache.

I would be very gratefull if you could do that test.

Regards,
Michal

Nitesh Naik napisaÅ(a):

Michal,

Thanks for your suggestion.

Changed parser to custom and used following sample ESI code.

<esi:assign name="test_string" value="This is test"/>
<esi:vars> $(test_string) </esi:vars>

Its Working perfectly fine.  Is squid not supporting all ESI tags ?

Regards
Nitesh Naik

----- Original Message ----- From: "Michal Pietrusinski" <[EMAIL PROTECTED]> To: "Nitesh Naik" <[EMAIL PROTECTED]> Cc: <squid-users@squid-cache.org> Sent: Tuesday, March 08, 2005 5:57 PM Subject: Re: [squid-users] Did Anyone used ESI with squid ?

Dear Nitesh,

It looks like the header is ok, since ESI processing started. I also had
problems with parser 'libxml2' - it was constantly reporting some
parsing errors even on simple pages which were validated with W3C


validator.

So finally I changed to 'custom' and 'expat' parsers.

I suggest you first try some really simple ESI constructs with 'custom'
parser.

Regards,
Michal

Nitesh Naik napisaÅ(a):

Dear Michal,

Thanks for your reply.

Let me send you some more information about settings that I am using.

We are using squid squid-3.0-PRE3-20041220 for parsing ESI.  squid is
compiled with esi ( --enable-esi ) but for some reason esi is not


getting

parsed and we get following error in the browser.

The following error was encountered:

ESI Processing failed.
The ESI processor returned:
esiProcess: Parse error at line 2: junk after document element
This means that:
The surrogate was not able to process the ESI template. Please report


this

error to the webmaster

ESI example used
<esi:assign name="date_string" value="$strftime($time(), '%a, %d %B %Y
%H:%M:%S %Z')"/>
<esi:vars>
$(date_string)
</esi:vars>


squid.conf settings

  httpd_accel_surrogate_id unset-id
  http_accel_surrogate_remote on
  esi_parser libxml2
  cache_peer xyz.com parent 80 0 no-query originserver

Apache configuration at origin server
 <Directory /esi/>
   Header add Surrogate-Control max-age=60,content="ESI/1.0"
   ExpiresActive On
   ExpiresByType text/html "now plus 1 minutes"
</Directory>


When we hit origin server the Surrogate-Control is added to header

HTTP/1.1 200 OK
Date: Fri, 04 Mar 2005 13:30:03 GMT
Surrogate-Control: max-age=60,content="ESI/1.0"
P3P: CP="NOI DSP COR CURa ADMa DEVa PSDa OUR BUS UNI COM NAV OTC",
policyref="/w3c/p3p.xml"
Last-Modified: Fri, 04 Mar 2005 12:50:06 GMT
ETag: "13c8a1-133-4228597e"
Accept-Ranges: bytes
Content-Length: 307
Connection: close
Content-Type: text/html

Regards
Nitesh Naik

----- Original Message ----- From: "Michal Pietrusinski" <[EMAIL PROTECTED]> To: <squid-users@squid-cache.org> Sent: Tuesday, March 08, 2005 5:26 PM Subject: Re: [squid-users] Did Anyone used ESI with squid ?

Dear Nitesh,

I'm also trying to use ESI with squid - I installed Squid 3, (remember
to use --enable-esi with configure) and pages are composed fine (I use
<esi:include>), but templates and fragments are not cached.

Remember that your pages must have appropriate HTTP headers in order

to

make squid parsing it as ESI templates.

I hope you are more lucky and will have your pages cached.

Regards,
Michal Pietrusinski

Nitesh Naik napisaÅ(a):

Hi,
I am having problem with configuring squid with ESI parsing. Did


anyone

implemented it ?


Regards
Nitesh Naik

Re: [squid-users] Did Anyone used ESI with squid ?

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