Apache output compression doesn't work when Content-Length is set
I have this minimal code that outputs some text:
<?php
$output = "";
for ($i = 0; $i < 7000; $i++)
$output .= ($i % 2) ? "Foo " : "Bar ";
header("Content-Length: ".strlen($output));
echo $output;
exit;
Using Apache 2.2.34 on my web server, and I'm unable to compress the output via .htaccess (see below).
But if I simply remove this header("Content-Length… line, suddenly the output is compressed as expected and the appropriate headers are sent (Content-Encoding: gzip, Vary: Accept-Encoding, Transfer-Encoding: chunked).
My .htaccess uses the AddOutputFilterByType and Filter* directives, I’ve tried both independently as well:
AddOutputFilterByType DEFLATE "text/html"
<IfModule filter_module>
FilterDeclare COMPRESS
FilterProvider COMPRESS DEFLATE Content-Type $text/html
FilterProvider COMPRESS DEFLATE resp=Content-Type /text/(css|javascript|plain|xml|x-component)/
FilterProvider COMPRESS DEFLATE resp=Content-Type /application/(javascript|json|xml|x-javascript)/
FilterChain COMPRESS
FilterProtocol COMPRESS change=yes;byteranges=no
</IfModule>
I'm not experiencing this issue in my local working environment, where I'm using Apache 2.4 (sadly I can't upgrade the server).
EDIT: In my case, the problem is solved, see my comments below.
php apache .htaccess http-headers http-compression
asked Nov 15 '18 at 7:35
NiavlysNiavlys
9251716
add a comment |
I have this minimal code that outputs some text:
<?php
$output = "";
for ($i = 0; $i < 7000; $i++)
$output .= ($i % 2) ? "Foo " : "Bar ";
header("Content-Length: ".strlen($output));
echo $output;
exit;
Using Apache 2.2.34 on my web server, and I'm unable to compress the output via .htaccess (see below).
But if I simply remove this header("Content-Length… line, suddenly the output is compressed as expected and the appropriate headers are sent (Content-Encoding: gzip, Vary: Accept-Encoding, Transfer-Encoding: chunked).
My .htaccess uses the AddOutputFilterByType and Filter* directives, I’ve tried both independently as well:
AddOutputFilterByType DEFLATE "text/html"
<IfModule filter_module>
FilterDeclare COMPRESS
FilterProvider COMPRESS DEFLATE Content-Type $text/html
FilterProvider COMPRESS DEFLATE resp=Content-Type /text/(css|javascript|plain|xml|x-component)/
FilterProvider COMPRESS DEFLATE resp=Content-Type /application/(javascript|json|xml|x-javascript)/
FilterChain COMPRESS
FilterProtocol COMPRESS change=yes;byteranges=no
</IfModule>
I'm not experiencing this issue in my local working environment, where I'm using Apache 2.4 (sadly I can't upgrade the server).
EDIT: In my case, the problem is solved, see my comments below.
php apache .htaccess http-headers http-compression
asked Nov 15 '18 at 7:35
NiavlysNiavlys
9251716
[Self-answer as a comment, because it's not really an answer] I suspect this behaviour is deliberate, considering the Content-length header is supposed to indicate the compressed size, not the uncompressed size as is the case here.
– Niavlys
Dec 2 '18 at 15:14
The reason I started experiencing this issue is because I switched to Slim using PHP-DI's Slim-Bridge (github.com/PHP-DI/Slim-Bridge), and the default configuration sets theaddContentLengthHeaderto true, forcing Slim to add the Content-Length header to the uncompressed content before handing it to Apache. The fix was as simple as adding"settings.addContentLengthHeader" => falsein my definitions array.
– Niavlys
Dec 2 '18 at 15:15
add a comment |
I have this minimal code that outputs some text:
<?php
$output = "";
for ($i = 0; $i < 7000; $i++)
$output .= ($i % 2) ? "Foo " : "Bar ";
header("Content-Length: ".strlen($output));
echo $output;
exit;
Using Apache 2.2.34 on my web server, and I'm unable to compress the output via .htaccess (see below).
But if I simply remove this header("Content-Length… line, suddenly the output is compressed as expected and the appropriate headers are sent (Content-Encoding: gzip, Vary: Accept-Encoding, Transfer-Encoding: chunked).
My .htaccess uses the AddOutputFilterByType and Filter* directives, I’ve tried both independently as well:
AddOutputFilterByType DEFLATE "text/html"
<IfModule filter_module>
FilterDeclare COMPRESS
FilterProvider COMPRESS DEFLATE Content-Type $text/html
FilterProvider COMPRESS DEFLATE resp=Content-Type /text/(css|javascript|plain|xml|x-component)/
FilterProvider COMPRESS DEFLATE resp=Content-Type /application/(javascript|json|xml|x-javascript)/
FilterChain COMPRESS
FilterProtocol COMPRESS change=yes;byteranges=no
</IfModule>
I'm not experiencing this issue in my local working environment, where I'm using Apache 2.4 (sadly I can't upgrade the server).
EDIT: In my case, the problem is solved, see my comments below.
php apache .htaccess http-headers http-compression
asked Nov 15 '18 at 7:35
NiavlysNiavlys
9251716
I have this minimal code that outputs some text:
<?php
$output = "";
for ($i = 0; $i < 7000; $i++)
$output .= ($i % 2) ? "Foo " : "Bar ";
header("Content-Length: ".strlen($output));
echo $output;
exit;
Using Apache 2.2.34 on my web server, and I'm unable to compress the output via .htaccess (see below).
But if I simply remove this header("Content-Length… line, suddenly the output is compressed as expected and the appropriate headers are sent (Content-Encoding: gzip, Vary: Accept-Encoding, Transfer-Encoding: chunked).
My .htaccess uses the AddOutputFilterByType and Filter* directives, I’ve tried both independently as well:
AddOutputFilterByType DEFLATE "text/html"
<IfModule filter_module>
FilterDeclare COMPRESS
FilterProvider COMPRESS DEFLATE Content-Type $text/html
FilterProvider COMPRESS DEFLATE resp=Content-Type /text/(css|javascript|plain|xml|x-component)/
FilterProvider COMPRESS DEFLATE resp=Content-Type /application/(javascript|json|xml|x-javascript)/
FilterChain COMPRESS
FilterProtocol COMPRESS change=yes;byteranges=no
</IfModule>
I'm not experiencing this issue in my local working environment, where I'm using Apache 2.4 (sadly I can't upgrade the server).
EDIT: In my case, the problem is solved, see my comments below.
php apache .htaccess http-headers http-compression
php apache .htaccess http-headers http-compression
asked Nov 15 '18 at 7:35
NiavlysNiavlys
9251716
asked Nov 15 '18 at 7:35
NiavlysNiavlys
9251716
edited Dec 2 '18 at 15:18
Niavlys
asked Nov 15 '18 at 7:35
NiavlysNiavlys
9251716
asked Nov 15 '18 at 7:35
NiavlysNiavlys
9251716
asked Nov 15 '18 at 7:35
NiavlysNiavlys
9251716
9251716
[Self-answer as a comment, because it's not really an answer] I suspect this behaviour is deliberate, considering the Content-length header is supposed to indicate the compressed size, not the uncompressed size as is the case here.
– Niavlys
Dec 2 '18 at 15:14
The reason I started experiencing this issue is because I switched to Slim using PHP-DI's Slim-Bridge (github.com/PHP-DI/Slim-Bridge), and the default configuration sets theaddContentLengthHeaderto true, forcing Slim to add the Content-Length header to the uncompressed content before handing it to Apache. The fix was as simple as adding"settings.addContentLengthHeader" => falsein my definitions array.
– Niavlys
Dec 2 '18 at 15:15
add a comment |
[Self-answer as a comment, because it's not really an answer] I suspect this behaviour is deliberate, considering the Content-length header is supposed to indicate the compressed size, not the uncompressed size as is the case here.
– Niavlys
Dec 2 '18 at 15:14
The reason I started experiencing this issue is because I switched to Slim using PHP-DI's Slim-Bridge (github.com/PHP-DI/Slim-Bridge), and the default configuration sets theaddContentLengthHeaderto true, forcing Slim to add the Content-Length header to the uncompressed content before handing it to Apache. The fix was as simple as adding"settings.addContentLengthHeader" => falsein my definitions array.
– Niavlys
Dec 2 '18 at 15:15
[Self-answer as a comment, because it's not really an answer] I suspect this behaviour is deliberate, considering the Content-length header is supposed to indicate the compressed size, not the uncompressed size as is the case here.
– Niavlys
Dec 2 '18 at 15:14
[Self-answer as a comment, because it's not really an answer] I suspect this behaviour is deliberate, considering the Content-length header is supposed to indicate the compressed size, not the uncompressed size as is the case here.
– Niavlys
Dec 2 '18 at 15:14
The reason I started experiencing this issue is because I switched to Slim using PHP-DI's Slim-Bridge (github.com/PHP-DI/Slim-Bridge), and the default configuration sets the
addContentLengthHeader to true, forcing Slim to add the Content-Length header to the uncompressed content before handing it to Apache. The fix was as simple as adding "settings.addContentLengthHeader" => false in my definitions array.– Niavlys
Dec 2 '18 at 15:15
The reason I started experiencing this issue is because I switched to Slim using PHP-DI's Slim-Bridge (github.com/PHP-DI/Slim-Bridge), and the default configuration sets the
addContentLengthHeader to true, forcing Slim to add the Content-Length header to the uncompressed content before handing it to Apache. The fix was as simple as adding "settings.addContentLengthHeader" => false in my definitions array.– Niavlys
Dec 2 '18 at 15:15
add a comment |
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[Self-answer as a comment, because it's not really an answer] I suspect this behaviour is deliberate, considering the Content-length header is supposed to indicate the compressed size, not the uncompressed size as is the case here.
– Niavlys
Dec 2 '18 at 15:14
The reason I started experiencing this issue is because I switched to Slim using PHP-DI's Slim-Bridge (github.com/PHP-DI/Slim-Bridge), and the default configuration sets the
addContentLengthHeaderto true, forcing Slim to add the Content-Length header to the uncompressed content before handing it to Apache. The fix was as simple as adding"settings.addContentLengthHeader" => falsein my definitions array.– Niavlys
Dec 2 '18 at 15:15