ufgeorge edited a comment on issue #1709:
URL: 
https://github.com/apache/incubator-pagespeed-ngx/issues/1709#issuecomment-682303142


   > The image 
https://course.soundshine.com.tw/shared_img/256/256F15651848520587.png gets a 
200 status from alibabacloud.
   > Maybe the rewrited image 
https://course.soundshine.com.tw/shared_img/256/256F15651848520587.png.pagespeed.ce.06-1T8jikK.png
 is requested to alibabacloud and it don“t have it?
   
   The original  img url 
https://doctrans-tw.oss-cn-shenzhen.aliyuncs.com/256/256F15651848520587.png is 
ali cloud storage url. So rewrite url 
https://course.soundshine.com.tw/shared_img/256/256F15651848520587.png still 
from ali cloud seems no issue.
   
   But 404 url is  
https://course.soundshine.com.tw/shared_img/256/256F15651848520587.png.pagespeed.ce.06-1T8jikK.png
 .
   It looks pagespeed rewrite not only url but also the img itself.
   Of course ali cloud will not have this img.
   I assume this rewrited img should be in pagespeed cache but not. So cause 
404.
   


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