Title: Zero Lenght File with CSS optimization
Last modified: August 21, 2016
---
# Zero Lenght File with CSS optimization
* Resolved [birdy](https://wordpress.org/support/users/ozum/)
* (@ozum)
* [12 years, 11 months ago](https://wordpress.org/support/topic/zero-lenght-file-with-css-optimization/)
* Hello,
* First of all, thanks for your hard work with this plugin.
* I’m using your plugin (3.7.1) in two hosts. In one of them it works very well,
but I couldn’t use CSS optimization on wpengine.com (see [http://ozum.wpengine.com](http://ozum.wpengine.com))
* On both host I have the same site (exact clone).
* On FTP I see 3 css cache files (25 Bytes, 71 Bytes, Zero Byte). It should many
KB. When I try to optimize JS it generates js file correctly. So there isn’t
permission issue.
* define(“AUTOPTIMIZE_LEGACY_MINIFIERS”,”true”); trick didn’t work either.
* Strangely plugin works very well on a fresh installed site on wpengine, but stops
after migration. I tried to disable all plugins except autoptimize and same thing
happened.
* In summary:
1. On host A: With full site: WORKS 2. On wpengine: Default fresh
WP install + autoptimize: WORKS 3. On wpengine: After migration full site: CSS
DOES NOT WORK, JS WORKS 4. On wpengine: After migration full site, disable all
plugins: CSS DOES NOT WORK, JS WORKS 5. On wpengine: Default fresh WP install
+ autoptimize install + migrate full site without plugins/autoptimize and without
cache folder: CSS DOES NOT WORK, JS WORKS
* Can you please help,
* Regards,
* [http://wordpress.org/plugins/autoptimize/](http://wordpress.org/plugins/autoptimize/)
Viewing 15 replies - 1 through 15 (of 17 total)
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* Plugin Author [Frank Goossens](https://wordpress.org/support/users/futtta/)
* (@futtta)
* [12 years, 11 months ago](https://wordpress.org/support/topic/zero-lenght-file-with-css-optimization/#post-4321044)
* That’s very weird, nothing comes to mind really. Can you check permissions on
your CSS-files (and directories in which those live)?
* Thread Starter [birdy](https://wordpress.org/support/users/ozum/)
* (@ozum)
* [12 years, 11 months ago](https://wordpress.org/support/topic/zero-lenght-file-with-css-optimization/#post-4321047)
* After cleared cache confirming there is no file then refreshed page:
* (I shortened file names for easy read.)
File Permission Group Owner Size cache
775 33 33 cache/autoptimize 775 33 33 cache/autoptimize/XXX.js 664 33 33 137KB(
correct) cache/autoptimize/AAA.css 664 33 33 71B (broken) cache/autoptimize/BBB.
css 664 33 33 0 (broken)
* Plugin Author [Frank Goossens](https://wordpress.org/support/users/futtta/)
* (@futtta)
* [12 years, 11 months ago](https://wordpress.org/support/topic/zero-lenght-file-with-css-optimization/#post-4321050)
* OK, and how about the “source css”-files (i.e. those that autoptimize aggregates)?
* Thread Starter [birdy](https://wordpress.org/support/users/ozum/)
* (@ozum)
* [12 years, 11 months ago](https://wordpress.org/support/topic/zero-lenght-file-with-css-optimization/#post-4321053)
* I disabled autoptimize, so you can see them with firebug.
* I have three sites:
[http://www.fortibase.com](http://www.fortibase.com) (autoptimize
enabled and works well) ozum.wpengine.com (autoptimize disabled you can see all
css) murat.wpengine.com (autoptimize enabled without any other plugin, so fewest
CSS)
* Plugin Author [Frank Goossens](https://wordpress.org/support/users/futtta/)
* (@futtta)
* [12 years, 11 months ago](https://wordpress.org/support/topic/zero-lenght-file-with-css-optimization/#post-4321065)
* 1. can you temporarily disable AO on fortibase.com as well?
2. can you check
the rights on the “source css”-files?
* Thread Starter [birdy](https://wordpress.org/support/users/ozum/)
* (@ozum)
* [12 years, 11 months ago](https://wordpress.org/support/topic/zero-lenght-file-with-css-optimization/#post-4321075)
* 1. I disabled AO on frotibase.com
2. I checked theme’s css permissions are 664
* On wpengine I temporarily switched to thirteen theme and AO worked for CSS. When
I switch back to Kickstart theme it stopped working. But as I told you same theme
works on other host.
* Plugin Author [Frank Goossens](https://wordpress.org/support/users/futtta/)
* (@futtta)
* [12 years, 11 months ago](https://wordpress.org/support/topic/zero-lenght-file-with-css-optimization/#post-4321116)
* 1. you can switch AO back on on fortibase.com
2. are all autoptimized CSS-files
empty on murat.wpengine.com?
* up until now I have absolutely no idea what is going on, I’m afraid. The combination
of wepengine + kickstart seems to be troubling for AO, but …
* I’ll go over the code to see if I can add some extra error-handling in the near
future, but you might have to live without CSS optimization on wpengine for now.
* Thread Starter [birdy](https://wordpress.org/support/users/ozum/)
* (@ozum)
* [12 years, 11 months ago](https://wordpress.org/support/topic/zero-lenght-file-with-css-optimization/#post-4321123)
* No, there are 3 CSS.
* 2 of them is very short 25 Bytes and 71 bytes with contents below:
1. html{margin-
top:28px !important}* html body{margin-top:28px !important} 2. #wpadminbar{display:
none}
* Those are same in both working and non-working site. So I assume they created
correctly.
* Third one is zero byte, which should 150-200 KB according to working site.
* Thank you for your kind help and for this great plugin.
* Benchmarks based on my experiences:
For CSS, I have better results than I have
with W3 Total cache. W3TC created more files/requests. For JS AO created less
files/requests than W3TC, but my site didn’t worked well with AO, but woked with
W3TC. However I use Cloudflare for JS, because their rocketloader is fascinating.
* Thread Starter [birdy](https://wordpress.org/support/users/ozum/)
* (@ozum)
* [12 years, 11 months ago](https://wordpress.org/support/topic/zero-lenght-file-with-css-optimization/#post-4321135)
* I trapped the problem in one statement:
* I use a child theme. In the child theme’s style.css I call parent theme’s style.
css with following standard statement:
* [@import](https://wordpress.org/support/users/import/) url(“../kickstart/style.
css”);
* If I delete [@import](https://wordpress.org/support/users/import/) statement,
AO works as expected. This happens only on wpengine.com. In other host, this
does not cause any problems.
* Plugin Author [Frank Goossens](https://wordpress.org/support/users/futtta/)
* (@futtta)
* [12 years, 11 months ago](https://wordpress.org/support/topic/zero-lenght-file-with-css-optimization/#post-4321156)
* Given that it works on your other host (and it should, imports are indeed managed
in wp-content/plugins/autoptimize/classes/autoptimizeStyles.php starting from
line 157, I test with multiple themes, many of which do CSS imports), my gut
feeling says must have something to do with rights somehow anyhow …
* If you’re familiar with PHP, you could add some debugging in autoptimizeStyles.
php to see what is going on, e.g.;
* ```
$this->ao_logger("import CSS url: ".$url);
```
* on line 167 or
* ```
$this->ao_logger("import CSS path: ".$path);
```
* a couple of lines below. Those debug-calls should create a file in /wp-content,
which might help in understanding where things fail?
* Plugin Author [Frank Goossens](https://wordpress.org/support/users/futtta/)
* (@futtta)
* [12 years, 10 months ago](https://wordpress.org/support/topic/zero-lenght-file-with-css-optimization/#post-4321259)
* I’ve just pushed a first test-version of 1.7.2 to the plugin repository. It _should_
fix the CSS-import problem. You can [download the test-version here](http://downloads.wordpress.org/plugin/autoptimize.zip).
Looking forward to your feedback!
* Plugin Author [Frank Goossens](https://wordpress.org/support/users/futtta/)
* (@futtta)
* [12 years, 10 months ago](https://wordpress.org/support/topic/zero-lenght-file-with-css-optimization/#post-4321261)
* 1.7.2 is now released, hope it fixes the weird zero-length problem on WPEngine.
* Thread Starter [birdy](https://wordpress.org/support/users/ozum/)
* (@ozum)
* [12 years, 10 months ago](https://wordpress.org/support/topic/zero-lenght-file-with-css-optimization/#post-4321267)
* Dear futtta,
* Since I don’t know PHP I cannot test autoptimizeStyles.php.
* I tested 1.7.2, and unfortunately 1.7.2 does not solve zero-length problem on
WPEngine.
* Anyone else having same problem, here is my temporary solution:
* I removed [@import](https://wordpress.org/support/users/import/) url(“../kickstart/
style.css”); from CSS files and requested that file from PHP generated HTML files
like:
* /../kickstart/
style.css” type=”text/css” />
* Although it is not a best practice for WordPress, autoptimize works well with
this on wpengine. This problem doesn’t appear on other hosts, so I can live with
that solution.
* Plugin Author [Frank Goossens](https://wordpress.org/support/users/futtta/)
* (@futtta)
* [12 years, 10 months ago](https://wordpress.org/support/topic/zero-lenght-file-with-css-optimization/#post-4321268)
* Thanks for the feedback Ozum.
* Pretty disappointed the extra checks for import-rules in 1.7.2 did not fix this.
No idea what WPengine is so different at WPengine that imports don’t work there(
and hence no idea how to solve).
* Good to know there is a workaround, thanks for that (I’ll add a reference to
it in the FAQ)!
* Thread Starter [birdy](https://wordpress.org/support/users/ozum/)
* (@ozum)
* [12 years, 10 months ago](https://wordpress.org/support/topic/zero-lenght-file-with-css-optimization/#post-4321269)
* Thank you for your effort.
* For your F.A.Q.
* I added that line to header.php and some themes have header-xxx.php where xxx
is several types of header files. One should add the line below all of the header
files and add his/her theme name instead of [THEME FOLDER HERE]
* /../[THEME
FOLDER HERE]/style.css” type=”text/css” />
* Regards,
Viewing 15 replies - 1 through 15 (of 17 total)
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## Tags
* [wpengine](https://wordpress.org/support/topic-tag/wpengine/)
* 17 replies
* 2 participants
* Last reply from: [Frank Goossens](https://wordpress.org/support/users/futtta/)
* Last activity: [12 years, 9 months ago](https://wordpress.org/support/topic/zero-lenght-file-with-css-optimization/page/2/#post-4321280)
* Status: resolved