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gzip ob_gzhandler cannot be used twice

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In a bid to make my site faster I thought I would do as the site tests suggest and implement gzip page compression.

I have checked to see that gzip is enabled. Check.

I have added the following code to my .htaccess file. (I also tried the AddOutputFilterByType DEFLATE text/plain but that didn't seem to work, which may be down to the fact that I hadn't added <? ob_start("ob_gzhandler"); ?> at that time)

<ifModule mod_gzip.c>
mod_gzip_on Yes
mod_gzip_dechunk Yes
mod_gzip_item_include file \.(html?|txt|css|js|php|pl)$
mod_gzip_item_include mime ^application/x-javascript.*
mod_gzip_item_include mime ^text/.*
mod_gzip_item_exclude rspheader ^Content-Encoding:.*gzip.*
mod_gzip_item_exclude mime ^image/.*
mod_gzip_item_include handler ^cgi-script$

Added this code in my php: <? ob_start("ob_gzhandler"); ?>

However I get the following error:

ob_start(): failed to create buffer in /somefolder/anotherfolder on line 2, referer: https://www.google.com/
...mod_fcgid: stderr: PHP Warning:  ob_start(): output handler 'ob_gzhandler' cannot be used twice...

Took me ages to find the fact that I needed the <? ob_start("ob_gzhandler"); ?> in my pages. Annoyingly, most sites tell you to just add the mod_gzip code to .htaccess file.

Any ideas?

Edited by thunderousity
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Ah ok - Done a bit more reading. I thought the ob_gzhandler indicated to the server to run gzip for that page.

I have removed both the mod_gzip text from the .htaccess file and the ob_gz_handler part from the page.

I removed the mod_gzip text from the .htaccess file as it still wasn't compressing according to whatsmyip gzip test

I added the following Deflate text to the .htaccess file instead to see if this would work but still no compression.  

AddOutputFilterByType DEFLATE text/plain
AddOutputFilterByType DEFLATE text/html
AddOutputFilterByType DEFLATE text/xml
AddOutputFilterByType DEFLATE text/css
AddOutputFilterByType DEFLATE application/xml
AddOutputFilterByType DEFLATE application/xhtml+xml
AddOutputFilterByType DEFLATE application/rss+xml
AddOutputFilterByType DEFLATE application/javascript
AddOutputFilterByType DEFLATE application/x-javascript

Using Chrome dev tools I checked the response headers and there is no content-encoding being returned despite Accept- encoding being present in the request header section and returning 'gzip, deflate'.

Edited by thunderousity
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I would add the gzip stuff back to htaccess.  You want to enable that.  The server should negotiate with the browser to determine what to use, you wouldn't want the server to always use gzip if the browser didn't support it.

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