ETag (entity tag) response header not being added to server side include"s
ETag (entity tag) response header not being added to server side include"s
am 05.01.2010 20:13:17 von Geoff Millikan
Dear List,
Our ETag response header is being added successfully on all responses except
those files containing server side includes. For example:
ETag is being set:
http://www.t1shopper.com/1KB.html
Etag not set:
http://www.t1shopper.com/index.shtml
The shtml files are using virtual includes like this:
How can I get Etag response header to show up on shtml files?
Best Regards,
Geoff Millikan
Newbury Park, CA, USA 91320
http://www.t1shopper.com/
---== httpd.conf Apache 2.2.3 (RedHat5) ==---
FileETag All
AddType text/html .shtml
AddOutputFilter INCLUDES .shtml
--== Headers ==--
http://www.t1shopper.com/1KB.html
HTTP/1.x 200 OK
Date: Tue, 05 Jan 2010 19:01:40 GMT
Server: Apache
Last-Modified: Wed, 02 Jul 2008 23:12:50 GMT
Etag: "16904da-45112a1a44080"
Accept-Ranges: bytes
Cache-Control: max-age=15552000
Expires: Sun, 04 Jul 2010 19:01:21 GMT
Vary: Accept-Encoding,User-Agent
Content-Encoding: gzip
Content-Length: 41
Age: 19
Keep-Alive: timeout=3, max=100
Connection: Keep-Alive
Content-Type: text/html
http://www.t1shopper.com/index.shtml
HTTP/1.x 200 OK
Date: Tue, 05 Jan 2010 19:02:33 GMT
Server: Apache
Accept-Ranges: bytes
Cache-Control: max-age=15552000
Expires: Sun, 04 Jul 2010 19:02:33 GMT
Vary: Accept-Encoding,User-Agent
Content-Encoding: gzip
Content-Length: 7523
Keep-Alive: timeout=3, max=100
Connection: Keep-Alive
Content-Type: text/html
This couldn't possibly be a bug as Etag support started in 1.3.23 and SSI
before that!
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Re: ETag (entity tag) response header not being added
am 05.01.2010 20:36:39 von Eric Covener
On Tue, Jan 5, 2010 at 2:13 PM, Geoff Millikan wr=
ote:
> Dear List,
>
> Our ETag response header is being added successfully on all responses exc=
ept
> those files containing server side includes. =A0For example:
>
> ETag is being set:
> http://www.t1shopper.com/1KB.html
>
> Etag not set:
> http://www.t1shopper.com/index.shtml
>
> The shtml files are using virtual includes like this:
>
>
> How can I get Etag response header to show up on shtml files?
I think this is a long-standing limitation, since the etag can't be
easily precomputed for the overall response (all the included stuff
smushed together from potential exec's, etc)
--=20
Eric Covener
covener@gmail.com
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RE: ETag (entity tag) response header not being added to server side include"s
am 05.01.2010 23:50:56 von Geoff Millikan
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charset="us-ascii"
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> I think this is a long-standing limitation, since the etag can't be
> easily precomputed for the overall response (all the included stuff
> smushed together from potential exec's, etc)
I understand however the FileETag documentation doesn't even *hint* at such
a limitation.
By comparison, mod_disk_cache has no problem reading all the SSI stuff
together and then caching the page (as long as "include virtual" is used).
I think if mod_disk_cache can do it then so can FileETag. (For that matter,
FileETag could generate its Etag off the cached document!)
http://httpd.apache.org/docs/2.2/caching.html#overview
http://httpd.apache.org/docs/2.2/mod/core.html#fileetag
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Re: ETag (entity tag) response header not being added
am 06.01.2010 01:15:21 von Eric Covener
On Tue, Jan 5, 2010 at 5:50 PM, Geoff Millikan wrote:
>> I think this is a long-standing limitation, since the etag can't be
>> easily precomputed for the overall response (all the included stuff
>> smushed together from potential exec's, etc)
>
> I understand however the FileETag documentation doesn't even *hint* at such
> a limitation.
It should more clearly state that it generates ETags for static files
only. The resource in question is not really a static file.
> By comparison, mod_disk_cache has no problem reading all the SSI stuff
> together and then caching the page (as long as "include virtual" is used).
> I think if mod_disk_cache can do it then so can FileETag.
The cache doesn't know the full contents of the response until it's
all been written to the client via the output filters. You can't
calculate headers at the end of a response and still use them.
> (For that matter,
> FileETag could generate its Etag off the cached document!)
It's not a file.
--
Eric Covener
covener@gmail.com
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RE: ETag (entity tag) response header not being added to server side include"s
am 06.01.2010 02:03:30 von Geoff Millikan
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> [The Apache documentation] should more clearly state that
> it generates ETags for static files only. The resource in
> question is not really a static file.
I imagine there's nothing I can do to help get the 2.2 docs updated but if
there is, I'm happy to help.
> The cache doesn't know the full contents of the response until it's
> all been written to the client via the output filters. You can't
> calculate headers at the end of a response and still use them.
I understand the full contents of the item (and its headers) cannot be known
until it's cached - but then once cached, everything is known, headers
included I believe? This implies items served from cache could have an Etag
merged or appended to the already-known headers. Regardless, Apache
doesn't offer a way to add an Etag to dynamic content today. Rats.
Thanks,
Geoff
PS. The digest at http://httpd.markmail.org/search/?q=etag shows half a
dozen people trying to write custom applications to do this. Now if the
HTTP Project takes it on then the world saves untold CPU cycles/bandwidth or
maybe even bringing global peace. For that, I'll put up a couple hundred
bucks up to see the feature added - anyone on Apace dev reading this, just
let me know when it's in trunk and just email me your PayPal info. Or let me
know what beer you like - I'm good for a case shipped anywhere in the USA.
PPS. BTW Apache rocks. We indorse it publically so keep up the good work!
http://www.t1shopper.com/businesspartners.shtml#apache
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Re: ETag (entity tag) response header not being added
am 06.01.2010 13:31:12 von Eric Covener
On Tue, Jan 5, 2010 at 8:03 PM, Geoff Millikan wrote:
>> [The Apache documentation] should more clearly state that
>> it generates ETags for static files only. The resource in
>> question is not really a static file.
>
> I imagine there's nothing I can do to help get the 2.2 docs updated but if
> there is, I'm happy to help.
I updated the FileEtag documentation (shift-refresh on
http://httpd.apache.org/docs/2.2/mod/core.html#fileetag)
--
Eric Covener
covener@gmail.com
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RE: ETag (entity tag) response header not being added to server side include"s
am 06.01.2010 18:21:30 von Geoff Millikan
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Thanks. Apache 2.2 rocks and it's still rocking the free world after 15
years this February. Here's to another 15 years - keep up the good work
Apache Project!
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