[GitHub] [incubator-pagespeed-mod] MrTschi commented on issue #1944: XMLHttpRequest got not rewritten

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MrTschi commented on issue #1944: XMLHttpRequest got not rewritten
URL: 
https://github.com/apache/incubator-pagespeed-mod/issues/1944#issuecomment-529103192
 
 
   @Lofesa thanks for your help.
   What still confuses me is the fact, that normal images got rewritten by 
pagespeed when requested as "XMLHttpRequest" but divs with style 
"background-image" with image-url will not get optimized:
   
   **Simulate AJAX-Request with curl:**
   ```
   $ curl --silent 
'https://www.living-zone.de/widgets/emotion/index/emotionId/19/controllerName/index'
 -XGET -H 'X-Requested-With: XMLHttpRequest'
   ```
   Result: Pagespeed does not rewrite background images
   ```
   [...]
   <div [...] 
style="background-image:url(https://www.living-zone.de/media/image/2c/4f/02/Gartebnmobel-topseller.jpg)">
   [...]
   ```
   But rewrites normal <img> images so it does something:
   ```
   <img 
src="https://www.living-zone.de/media/image/84/f9/9a/xedelstahl_essgruppe_bilbao_8_160_220_schwarz_01_420x420.jpg.pagespeed.ic.bm9NefcOzU.jpg";
 [...]/>
   ```
   
   **"Normal" page calls without the XMLHttpRequest header will work:**
   ```
   $ curl --silent 
'https://www.living-zone.de/widgets/emotion/index/emotionId/19/controllerName/index'
 -XGET |grep background-image
   ```
   Result: Pagespeed will also rewrite background images:
   ```
   [...]
   <div [...] 
style="background-image:url(https://www.living-zone.de/media/image/7f/26/d6/xGartenmobel-Ausverkauf.jpg.pagespeed.ic.WKw6ZP9R7j.jpg)">
   [...]
   ```

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