129021 - header("Content-Encoding: gzip") doesn't decode right

Status: CLOSED INVALID

(Core :: Networking: HTTP, defect)

Description

[Gregor Richner]

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (Windows; U; WinNT4.0; en-US; rv:0.9.8) Gecko/20020204
BuildID:    2002020406

I have written a php page with
"header("Content-Encoding: gzip");"
and it works fine with opera5&6, netscape 4.7x, InetEx but is not decoded for
Mozilla and Netscape 6.2.1
It looks like someone forgot to put in a decode method for gzip or deflate... 
even if the browser keeps telling:
_SERVER["HTTP_ACCEPT_ENCODING"]gzip, deflate, compress;q=0.9 

there are two posibilities to resolve this problem:
1. remove the HTTP_ACCEPT_ENCODING line ... OR
2. put in the right decoding procedure/method 

CU
Gregor Richner

Reproducible: Always
Steps to Reproduce:
1.read description above
2.
3.

Actual Results:  read description above

Expected Results:  read description above

read description above

Comment 1

[timeless]

1. please provide a testcase
2. please don't give us ultimatums until someone has had time to analyze the 
problem (and even then, ultimatums are hardly welcome).

Comment 2

[Gregor Richner]

testcase PHP4 source:

<?php
if(strstr($HTTP_SERVER_VARS['HTTP_ACCEPT_ENCODING'],'gzip'))
{
// Start output buffering, and register compress_output() (see 
// below)

ob_start("compress_output");
// Tell the browser the content is compressed with gzip
header("Content-Encoding: gzip");
print ("<center><h3>This is a gzip-compressed text...</h3></center>");
}
else
if(strstr($HTTP_SERVER_VARS['HTTP_ACCEPT_ENCODING'],'x-gzip'))
{
// Start output buffering, and register compress_output() (see 
// below)
ob_start("compress_output");
// Tell the browser the content is compressed with x-gzip
header("Content-Encoding: x-gzip");
print ("<center><h3>This is a x-gzip-compressed text...</h3></center>");
}
else
{
print ("<center><h3>This is a uncompressed text... Text</h3></center>");
}
?>

Comment 3

[Boris Zbarsky [:bzbarsky]]

Are you using gzip?  Or deflate?  Or both?  We have issues with deflate, but
gzip should be working (there are plenty of pages out there where it does).  Is
there a live test page we can see this on?  (I have no PHP here).

Comment 4

[Darin Fisher]

reporter: are you trying to view the document, save it to a file, or feed it to
a helper app?  thx!

Comment 5

[Gregor Richner]

the script (Additional Comment #2) checks if the browser can gzip or x-gzip or nothing
and then it 
prints the appropriate text in the browser window (no other appication involved).

Comment 6

[Boris Zbarsky [:bzbarsky]]

So... does php3 support encoding like that?  I have a php3 setup I could test
on.  Failing that, is it possible to put a small testcase online so that I could
get a look at what we send to the server and what we get back?

Comment 7

[Gregor Richner]

sorry "ob_start" is not defined in php3 and this is needed to prevent php from sending headers 
before your header is send...
I am trying to put the above test case on a reachable server but I 
cannot promise that!

OR 
compile php and apache for yourself on Linux/UNIX it looks 
like

./configure --with-apache=../path/to/apachesrc --with-zlib=yes --with-xml --enable-trans-
sid --enable-inline-optimization --enable-magic-quotes --enable-sockets --enable-sysvsem --enable-
sysvshm --enable-shmop --enable-calendar --enable-memory-limit --enable-force-cgi-redirect --enable-
discard-path --enable-sigchild --with-openssl --with-imap-ssl

make

make 
install

./configure --activate-module=src/modules/php4/libphp4.a --
prefix=/usr/local/apache  --sbindir=/usr/sbin --enable-module=so

make 

make 
install

/usr/sbin/apachectl start

copy the Additional Comment #2 script to 
/usr/local/apache/htdocs/

you can also make the following script to see a testpage of the 
php installation:
<?php
phpinfo();
?>

download PHPsrc on 
http://www.php.net/
download APACHEsrc on http://www.apache.org/

CU
Gregor 
Richner

Comment 8

[Gregor Richner]

oops

I forgot to tell you to edit the /usr/local/apache/conf/httpd.conf

find the line 
beginning with
AddType application

then insert the following

AddType 
application/x-httpd-php .php .php4
AddType application/x-httpd-php-source .phps

CU 

Gregor Richner

PS: "make install" is one line

Comment 9

[Darin Fisher]

sent via email:

> Hi guys,
> 
> the bug mentioned at http://bugzilla.mozilla.org/show_bug.cgi?id=129021 is 
> not a bug.
> 
> I played up the PHP code on my domain, it does not compress any output, but 
> it sets a "Content-Encoding: gzip" header nevertheless. That's the reason, 
> why mozilla is confused. It is waiting for gzip-output but does only get 
> normal output.
> 
> You can test it with lynx on my domain 
> 
>     http://d42.de/falsezip.php
> 
> A call of "lynx -mime_header -source http://d42.de/falsezip.php" shows what 
> is actually happening:
> 
>   HTTP/1.1 200 OK
>   Date: Sun, 14 Apr 2002 00:13:50 GMT
>   Server: Apache/1.3.22 (Unix)
>   Content-Encoding: gzip
>                     ^^^^ <-- pretends to be gzip-encoding
>   X-Powered-By: PHP/4.1.1
>   Connection: close
>   Content-Type: text/html
> 
>   <center><h3>This is a gzip-compressed text...</h3></center>
>   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>   ^-- Just non-encoded output, no gzip at all
> 
> 
> So mozilla gets confused by gzip output which is no gzip output at all. I 
> also wrote a PHP script which does actually gzip the output, visible at 
> http://d42.de/truezip.php 
> 
> A call of "lynx -mime_header -source http://d42.de/truezip.php" shows what is 
> actually happening:
> 
>   HTTP/1.1 200 OK
>   Date: Sun, 14 Apr 2002 00:17:46 GMT
>   Server: Apache/1.3.22 (Unix)
>   Content-Encoding: gzip
>                     ^^^^ <- Says it will deliver compressed output
>   Vary: Accept-Encoding
>   X-Powered-By: PHP/4.1.1
>   Content-Length: 79
>   Connection: close
>   Content-Type: text/html
> 
>   ²INÍ+I-²³É0¶
>               ÉÈ,V¢D…ôªÌÝäüÜ‚¢ÔââÔ…’ÔŠ=== *¨.ÿÿΙå
>   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>   ^-- I can't read this, so it must be gzipped output.
> 
> Sorry, I fear I did everything wrong with mailing this comment, instead of 
> entering it into bugzilla, but I am tired, in a hurry and I did not really 
> understand how to use this bugzilla thing. I will look at it again when I am 
> less tired ;-). Gregor, can you enter this into Bugzilla for me?
> 
> Greetings
> Benjamin Schwenk

marking INVALID

Comment 10

[Gregor Richner]

I tried this out and have to agree with Benjamin Schwenk...

you have to put two lines in php.ini to make php able to compress data for ALL
php contents: 

output_buffering=ON
output_handler=ob_gzhandler


the handler is in php>=4.04

thanx
Gregor Richner