eldk opened a new issue #1850: Intermittent 404 errors with Invalid resource 
signature
URL: https://github.com/apache/incubator-pagespeed-mod/issues/1850
 
 
   Hello,
   
   I've some intermittent 404 for pictures.
   
   Logs in pagespeed console message history : 
   
   ```
   [Thu, 20 Dec 2018 13:08:43 GMT] [Info] [4569] Need to check cache size 
against target 4194304000
   [Thu, 20 Dec 2018 13:08:44 GMT] [Info] [4569] Invalid resource signature for 
https://www.domain.tld/edupict/www/images/xbandeau_la_maille_images.jpg.pagespeed.ic.Not8aSW8hh5obJN_uvmC.jpg
 provided. Expected 8sJtkrQCNg Received 5obJN_uvmC
   [Thu, 20 Dec 2018 13:08:44 GMT] [Warning] [4569] Fetch failed for 
https://www.domain.tld/edupict/www/images/xbandeau_la_maille_images.jpg.pagespeed.ic.Not8aSW8hh5obJN_uvmC.jpg,
 status=404
   [Thu, 20 Dec 2018 13:08:44 GMT] [Warning] [4569] 
https://www.domain.tld/edupict/www/images/xbandeau_la_maille_images.jpg.pagespeed.ic.Not8aSW8hh5obJN_uvmC.jpg
 resource_404_count: not found (404)
   ```
   
   Curl -I 
https://www.domain.tld/edupict/www/images/xbandeau_la_maille_images.jpg.pagespeed.ic.Not8aSW8hh5obJN_uvmC.jpg
   ```
   HTTP/1.1 200 OK
   Date: Thu, 20 Dec 2018 13:34:16 GMT
   Server: Apache/2.4.37
   Upgrade: h2,h2c
   Connection: Upgrade
   Link: 
<https://www.domain.tld/edupict/www/images/bandeau_la_maille_images.jpg>; 
rel="canonical"
   Expires: Sun, 15 Dec 2019 03:34:09 GMT
   Cache-Control: max-age=31536000
   Etag: W/"0"
   Last-Modified: Sat, 15 Dec 2018 03:34:09 GMT
   X-Original-Content-Length: 19884
   Content-Length: 19863
   Content-Type: image/jpeg
   ```
   Pagespeed conf : 
   ```
   ModPagespeedLoadFromFile "https://www.domain.tld/edupict/www/images/"; \
                            
"/home/www.domain.tld/public_html/edupict/www/images/"
   ```
   
   
   To reproduce : 
   - reload the page until a picture load gives a 404 error.
   - reload once again and no more 404 error
   
   - When the 404 error happened : 
   
   There is the "Invalid resource signature" message in logs.
   
   - When reload and 200 response is  given: 
   
   Picture is loaded with key that previous request said invalid.
   
   
   
   
   
   
   
   
   

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