[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

[bugzilla]

https://bz.apache.org/bugzilla/show_bug.cgi?id=45023

--- Comment #30 from klokhuiswer...@gmail.com ---
the issue with Comment 26 seems to me that if you send a request with
`if-none-match: "0-5debc62fd30dd-br"` it'll respond with `etag:
"0-5debc62fd30dd"` (which is missing the `-br` part)

it seems to me that something like the following solves it

SetEnvIf If-None-Match '^"((.*)-(gzip))"$' gzip
SetEnvIf If-None-Match '^"((.*)-(br))"$' br
RequestHeader edit "If-None-Match" '^"((.*)-(gzip|br))"$' '"$1", "$2"'
Header edit "ETag" '^"(.*)"$' '"$1-gzip"' env=gzip
Header edit "ETag" '^"(.*)"$' '"$1-br"' env=br

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[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

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Rainer Canavan  changed:

   What|Removed |Added

URL|https://www.1word4pics.com/ |
   Keywords|APIBug  |

--- Comment #32 from Rainer Canavan  ---
Undo spam change

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[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

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EricBaugh  changed:

   What|Removed |Added

URL||https://www.1word4pics.com/
   Keywords|RFC |APIBug

--- Comment #31 from EricBaugh  ---
I also applied this on my website https://www.1word4pics.com/ which was pretty
much easier than what it looks right now. The positive effects of these were
massive and did a great job for me as well

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[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

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--- Comment #30 from Gamers Dunia  ---
Wow , really got helped by this on my site
https://gamersdunia.com/coin-master-daily-free-spins-link-today/

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[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

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--- Comment #29 from Jake Baugh  ---
Thank you for sharing this, it really helped me improving my site performance.
https://www.coinmasterspinlinks.com/

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[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

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--- Comment #28 from Olivier Mehani  ---
The updated solution from Comment 26 fixed the issue (didn't try Comment 22).

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[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

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--- Comment #27 from Olivier Mehani  ---
I think I'm seeing the same issue with
* Apache 2.4.39
* HTTP/2
* GZipped transfer

When I first retrieve the URL, I get an ETag with '-gzip' appended.

$ curl -I 'https://example.net/file.png'  --compressed
HTTP/2 200
date: Fri, 02 Aug 2019 00:12:51 GMT
server: Apache/2.4.39 (Unix) LibreSSL/2.9.1 mod_chroot/0.5
last-modified: Fri, 02 Aug 2019 00:08:49 GMT
etag: "11b104-4fa0-58f1729a20024-gzip"
accept-ranges: bytes
cache-control: max-age=31536000
expires: Sat, 01 Aug 2020 00:12:51 GMT
vary: Accept-Encoding
content-encoding: gzip
strict-transport-security: max-age=15768000;
content-length: 18360
content-type: image/png

Any subsequent requests for that full ETag result in a 200 with the data being
re-transfered.

$ curl -I 'https://example.net/file.png'  --compressed -H 'If-None-Match:
"11b104-4fa0-58f1729a20024-gzip"'
HTTP/2 200
date: Fri, 02 Aug 2019 00:12:55 GMT
server: Apache/2.4.39 (Unix) LibreSSL/2.9.1 mod_chroot/0.5
last-modified: Fri, 02 Aug 2019 00:08:49 GMT
etag: "11b104-4fa0-58f1729a20024-gzip"
accept-ranges: bytes
cache-control: max-age=31536000
expires: Sat, 01 Aug 2020 00:12:55 GMT
vary: Accept-Encoding
content-encoding: gzip
strict-transport-security: max-age=15768000;
content-length: 18360
content-type: image/png

If I remove the '-gzip' suffix, I get the expected 304 response.

$ curl -I 'https://example.net/file.png'  --compressed -H 'If-None-Match:
"11b104-4fa0-58f1729a20024"'
HTTP/2 304
date: Fri, 02 Aug 2019 00:12:58 GMT
server: Apache/2.4.39 (Unix) LibreSSL/2.9.1 mod_chroot/0.5
etag: "11b104-4fa0-58f1729a20024"
expires: Sat, 01 Aug 2020 00:12:58 GMT
cache-control: max-age=31536000

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[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

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https://bz.apache.org/bugzilla/show_bug.cgi?id=45023

--- Comment #26 from Jacques Distler  ---
With a minor modification, the workaround in Comment 22 works for both
mod_deflate and mod_brotli :

RequestHeader edit "If-None-Match" '^"((.*)-(gzip|br))"$' '"$1", "$2"'

(using the default AddSuffix setting for both modules' ETag handling).

Seems to me that this should just be incorporated into the
"If-None-Match"-handling code in the server, rather than relying on users to
monkey with their httpd.config file.

But what do I know ?

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[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

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--- Comment #25 from Arjen de Korte  ---
(In reply to Martin Heide from comment #21)
> (In reply to Eric Covener from comment #17)
> > It's a copout, but I've made this configurable in r1586542 with a default
> > for now of maintaining the 2.4 behavior.
> 
> Hi Eric,
> will your workaround of r1586542 make it into some Apache 2.4 release? I saw
> that it 
> is integrated in 2.5, but it is not mentioned in the 2.4 docs.
> I tried the DeflateAlterETag directive, but it does not seem to available in
> Ubuntu 14.04 LTS (Apache 2.4.7).
> 
> Since you only added a directive, this cannot break any existing server
> configurations, so it should be available in 2.4, too!

*tap*tap*tap*, is this thing on?

Why do we have BrotliAlterETag in 2.4, but DeflateAlterETag not and is r1586542
still waiting to be backported?

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[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

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d...@ulupov.com changed:

   What|Removed |Added

 CC|d...@ulupov.com |

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[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

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https://bz.apache.org/bugzilla/show_bug.cgi?id=45023

Rainer Canavan  changed:

   What|Removed |Added

 Status|RESOLVED|REOPENED
 Resolution|MOVED   |---

--- Comment #24 from Rainer Canavan  ---
Undo spam change.

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[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

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moh.riza  changed:

   What|Removed |Added

 Resolution|--- |MOVED
 Status|REOPENED|RESOLVED

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[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

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Rainer Jung  changed:

   What|Removed |Added

   Priority|P5  |P2
   Severity|blocker |regression
  Component|All |mod_deflate
Version|2.2.4   |2.2.8
 Status|RESOLVED|REOPENED
 Resolution|WORKSFORME  |---
   Keywords||RFC

--- Comment #23 from Rainer Jung  ---
Undo spam change

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[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

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Kevin  changed:

   What|Removed |Added

   Severity|regression  |blocker
 Resolution|--- |WORKSFORME
   Priority|P2  |P5
   Keywords|RFC |
Version|2.2.8   |2.2.4
 Status|REOPENED|RESOLVED
  Component|mod_deflate |All

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[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

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Szőgyényi Gábor  changed:

   What|Removed |Added

 CC||szg0...@freemail.hu

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[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

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herr.er...@gmail.com changed:

   What|Removed |Added

 CC||herr.er...@gmail.com

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[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

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--- Comment #22 from joost.dekeij...@gmail.com ---
Am I correct to read in
http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.26 that the
If-None-Match header can contain mulitple ETAG values?

If so, maybe an alternative version of rahuls workaround could be:

RequestHeader edit "If-None-Match" '^"((.*)-gzip)"$' '"$1", "$2"'

With above line, I think there is no need to modify the outgoing Header and the
modefied RequestHeader works in with or without deflation

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[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

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https://issues.apache.org/bugzilla/show_bug.cgi?id=45023

--- Comment #21 from Martin Heide martin.he...@faroeurope.com ---
(In reply to Eric Covener from comment #17)
 It's a copout, but I've made this configurable in r1586542 with a default
 for now of maintaining the 2.4 behavior.

Hi Eric,
will your workaround of r1586542 make it into some Apache 2.4 release? I saw
that it 
is integrated in 2.5, but it is not mentioned in the 2.4 docs.
I tried the DeflateAlterETag directive, but it does not seem to available in
Ubuntu 14.04 LTS (Apache 2.4.7).

Since you only added a directive, this cannot break any existing server
configurations, so it should be available in 2.4, too!

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[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

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https://issues.apache.org/bugzilla/show_bug.cgi?id=45023

--- Comment #19 from Jesús Cea j...@jcea.es ---
Eric, I am graceful for the new directive, but why not implementing a better
ETAG verification instead of altering the ETAG generation?.

If you get an etag with a -gzip suffix, you just verify the etag without that
suffix. You could link this to the accept-encoding header, maybe.

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[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

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--- Comment #20 from Eric Covener cove...@gmail.com ---
(In reply to Jesús Cea from comment #19)
 Eric, I am graceful for the new directive, but why not implementing a better
 ETAG verification instead of altering the ETAG generation?.

My immediate concern is the unnecessary difference between 2.2 and 2.4,
allowing the 2.2 behavior in 2.4 is a lot simpler to tackle then adding some
third behavior (I admitted before it was a copout)

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[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

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Yann Ylavic ylavic@gmail.com changed:

   What|Removed |Added

 CC||j...@jcea.es

--- Comment #18 from Yann Ylavic ylavic@gmail.com ---
*** Bug 56354 has been marked as a duplicate of this bug. ***

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[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

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--- Comment #17 from Eric Covener cove...@gmail.com ---
It's a copout, but I've made this configurable in r1586542 with a default for
now of maintaining the 2.4 behavior.

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[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

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--- Comment #17 from Jackie Rosen jackie.ro...@hushmail.com ---
*** Bug 260998 has been marked as a duplicate of this bug. ***
Seen from the domain http://volichat.com
Page where seen: http://volichat.com/adult-chat-rooms
Marked for reference. Resolved as fixed @bugzilla.

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[Bug 45023] DEFLATE preventing 304 NOT MODIFIED response

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Eric Covener cove...@gmail.com changed:

   What|Removed |Added

 Status|RESOLVED|REOPENED
 Resolution|FIXED   |---

--- Comment #16 from Eric Covener cove...@gmail.com ---
Was this ever resolved in trunk/2.4?

Alias /deflate /home/covener/SRC/httpd-trunk/built/htdocs/index.html
Location /deflate
SetOutputFilter DEFLATE
/location


$ wget  --header=Accept-Encoding: gzip -S http://localhost/deflate
-O/dev/null 21 |grep ETag
  ETag: 58c5-4b26c6f28ce80-gzip

$ wget --header='If-None-Match: 58c5-4b26c6f28ce80-gzip' 
--header=Accept-Encoding: gzip -S http://localhost/deflate -O/dev/null 21
--2013-06-23 13:39:47--  http://localhost/deflate
Resolving localhost (localhost)... 127.0.0.1
Connecting to localhost (localhost)|127.0.0.1|:80... connected.
HTTP request sent, awaiting response... 
  HTTP/1.1 200 OK
  Date: Sun, 23 Jun 2013 17:39:47 GMT
  Server: Apache/2.5.0-dev (Unix) OpenSSL/1.0.1c
  Last-Modified: Wed, 23 Nov 2011 20:04:58 GMT
  ETag: 58c5-4b26c6f28ce80-gzip
  Accept-Ranges: bytes
  Vary: Accept-Encoding
  Content-Encoding: gzip
  Content-Length: 206
  Keep-Alive: timeout=5, max=100
  Connection: Keep-Alive
  Content-Type: text/html

covener@cov-w520:~/SRC/httpd-trunk$ wget --header='If-None-Match:
58c5-4b26c6f28ce80'  --header=Accept-Encoding: gzip -S
http://localhost/deflate -O/dev/null 21|grep HTTP/1.1
  HTTP/1.1 304 Not Modified

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d...@ulupov.com changed:

   What|Removed |Added

 CC||d...@ulupov.com




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--- Comment #15 from hacke...@gmail.com  2009-04-13 11:25:53 PST ---
I'm still experiencing this with 2.2.11-2ubuntu2 -- but adding these 2 lines
are suggested by rahul works:

RequestHeader  edit If-None-Match ^(.*)-gzip$ $1
Header  edit ETag ^(.*[^g][^z][^i][^p])$ $1-gzip

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Roy T. Fielding field...@apache.org changed:

   What|Removed |Added

 Status|NEW |RESOLVED
 Resolution||FIXED




--- Comment #14 from Roy T. Fielding field...@apache.org  2009-04-03 18:41:47 
PST ---
This bug was added in 2.2.8 in a failed attempt to address Bug 39727.
Since a real fix will require extensive changes, I have reverted the
change in 

  http://svn.apache.org/viewvc?view=revrevision=761835

Note: if you are patching a released version of the source code,
then extract the patch from the original change

  http://svn.apache.org/viewvc?view=revrevision=608849

and use patch -R to apply it in reverse.

Meanwhile, the original bug will still be tracked as issue 39727.

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Taco van den Broek [EMAIL PROTECTED] changed:

   What|Removed |Added

 CC||[EMAIL PROTECTED]
   ||l




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Franklin Tse [EMAIL PROTECTED] changed:

   What|Removed |Added

 Depends on||39727
   Severity|normal  |regression
  Component|Core|mod_deflate
 OS/Version|Linux   |All
   Platform|PC  |All




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Sidharth Kshatriya [EMAIL PROTECTED] changed:

   What|Removed |Added

 CC||[EMAIL PROTECTED]




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--- Comment #8 from Sidharth Kshatriya [EMAIL PROTECTED]  2008-09-18 08:23:02 
PST ---
Hello!

I'm also facing the same problem -- I had been scratching my head for sometime
before I found this bug report. I have to reduce my page size urgently and not
having gzip on is not really an option for me.

I'm not really comfortable having a customized compiled version of apache2 on
my system and the regular expression hack will also slow things down (will
it?).

Any alternative ideas? When might this bug be fixed?

Thanks,

Sidharth


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--- Comment #9 from Sidharth Kshatriya [EMAIL PROTECTED]  2008-09-18 08:27:57 
PST ---
I had a look at ap_hook_post_read_request attachment...seems like I can get
away with just compiling mod_deflate.c

I'm using Apache 2.2.8. Can anyone help me on where I can get the correct
source for the corresponding mod_deflate and how I can compile mod_deflate?

Thanks for your help!

Sidharth


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--- Comment #10 from Sidharth Kshatriya [EMAIL PROTECTED]  2008-09-18 
09:19:28 PST ---
Hi, 

Sorry for flooding this mailing list.

In this thread there is Rahul's mod_deflate patch and there are some patches in
this bug thread:

https://issues.apache.org/bugzilla/show_bug.cgi?id=39727
(mostly by Nick Kew)

Which one is the best solution?

Thanks,

Sidharth


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--- Comment #11 from rahul [EMAIL PROTECTED]  2008-09-18 10:27:15 PST ---
You will need both. This patch expects the other to have been applied (this is
already applied on trunk).
Also please use the [EMAIL PROTECTED] for questions.


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--- Comment #12 from Sidharth Kshatriya [EMAIL PROTECTED]  2008-09-18 
11:03:49 PST ---
Thanks for your response Rahul.

Unfortunately I am new to all of this. I applied Nick's patch to my
mod_deflate.c but I got patching errors...his patch is assuming a slightly
different mod_deflate.c from mine.

Would really appreciate if you were able to direct me to the place (or even
better just gave me the patched mod_deflate.c version) that I could just
compile.

[ASIDE: I am using apxs2 -c mod_deflate.c

with LDFLAGS=-lz set in /usr/bin/aprconfig

I notice that my original mod_deflate.so depends on libpthread. When I apply
your patch to my file and compile, I don't get dependency with libpthread.]

Please tell me if I would need to do any additional transformations to the file
you would provide me (assuming you can :-) ).

Thanks a Ton!

Sidharth
[Attaching the mod_deflate that I have. This I obtained by issuing
sudo apt-get install apache2-src 
on ubuntu. This is version 2.2.8 Apache]


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--- Comment #13 from Sidharth Kshatriya [EMAIL PROTECTED]  2008-09-18 
11:10:32 PST ---
Created an attachment (id=22605)
 -- (https://issues.apache.org/bugzilla/attachment.cgi?id=22605)
mod_deflate as found in apache2-src package on ubuntu version 2.2.8-1ubuntu0.3


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Maxime Ritter [EMAIL PROTECTED] changed:

   What|Removed |Added

 CC||[EMAIL PROTECTED]




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Franklin Tse [EMAIL PROTECTED] changed:

   What|Removed |Added

 CC||[EMAIL PROTECTED]




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rahul [EMAIL PROTECTED] changed:

   What|Removed |Added

  Attachment #22453|0   |1
is obsolete||




--- Comment #7 from rahul [EMAIL PROTECTED]  2008-08-21 08:13:07 PST ---
Created an attachment (id=22468)
 -- (https://issues.apache.org/bugzilla/attachment.cgi?id=22468)
use ap_hook_post_read_request instead of input filter

Incorporate suggested changes by Nick


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rahul [EMAIL PROTECTED] changed:

   What|Removed |Added

   Keywords||RFC




--- Comment #4 from rahul [EMAIL PROTECTED]  2008-08-19 05:36:44 PST ---
There is a workaround, 
If you are serving from a location say /js
You can use a configuration like below to switch ETag: $1-gzip to $1 

Location /js
RequestHeader  edit If-None-Match ^(.*)-gzip$ $1
Header  edit ETag ^(.*[^g][^z][^i][^p])$ $1-gzip
/Location

(Perhaps this should be done from mod_deflate as input filter
with the condition that if Client requests with Accept-Encoding: gzip
only then modify If*match headers to their un-gzip values.)

(Also the current value of ETag (+gzip) is not RFC compliant, since RFC
mandates
a quoted string as the value of ETag. As the noted by john, -gzip should be
inside quotes.)


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--- Comment #5 from rahul [EMAIL PROTECTED]  2008-08-19 06:41:51 PST ---
Created an attachment (id=22453)
 -- (https://issues.apache.org/bugzilla/attachment.cgi?id=22453)
A POC slightly better than the above conf lines,

Adds an input filter ETAG that can be used like below, along with DEFLATE
to let apache recognize ($1)-gzip as $1

AddInputFilter ETAG .txt
AddOutputFilterByType DEFLATE text/plain


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--- Comment #6 from John Siracusa [EMAIL PROTECTED]  2008-08-19 07:47:26 PST 
---
Both the workaround in comment #4 and the patch in comment #5 appear to work. 
Neither are real fixes for the bug, however.  (But I'm glad I have something
to work with until a real fix arrives, so thanks rahul!)


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John Siracusa [EMAIL PROTECTED] changed:

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 CC||[EMAIL PROTECTED]




--- Comment #3 from John Siracusa [EMAIL PROTECTED]  2008-06-24 07:32:39 PST 
---
This bug nearly defeats the purpose of mod_deflate.  I turned mod_deflate on
with the intent of saving bandwidth when sending JavaScript and CSS files. 
Instead, I'm using *more* bandwidth for every request but the first. 
(Previously, subsequent requests would result in small, no-content 304
responses.  Now the compressed JS and CSS files are sent every time.)

BTW, the change that appends -gzip to the etag (revision 607219, I think) is
a bit wacky in its own right in that it appends outside the double quotes. 
IOW, if the original header is:

Etag: 5954c6-10f4-449d11713aac0

the modified header ends up as:

Etag: 5954c6-10f4-449d11713aac0-gzip

when it probably should be:

Etag: 5954c6-10f4-449d11713aac0-gzip

with the -gzip inside the quotes.  I altered the code to do this, but it had
no affect on this 304 bug.  I just wanted to note it here so the situation is
avoided when this bug is fixed for real.


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