Lofesa commented on issue #1897:
URL: 
https://github.com/apache/incubator-pagespeed-mod/issues/1897#issuecomment-970653134


   I
   
   > 
   > 
   > For now I've added using the add_header for the cache control and it seems 
to show ok
   > 
   > I also added a header to the location directive for static files to make 
sure it's processed by nginx and not by apache.
   > 
   > 
![image](https://user-images.githubusercontent.com/20220341/142049801-ea566918-0922-414b-9681-8a0ae8d4f809.png)
   > 
   > I added a similar header in apache requests to differentiate to requests 
processed by apache and nginx
   > 
   > 
![image](https://user-images.githubusercontent.com/20220341/142049926-5963cfd2-ee72-4188-93be-424edb0d586f.png)
   > 
   > Should I add etag off too?
   > 
   > Expires directive is gone.
   > 
   > Of course the 4xx error is still there.
   
   I still viewing mixed cache-control header and ioweb-served-by
   Only  tested images, some have it, some apache and some nginx, and other 
don´t have the ioweb-served-by header.
   and 2 or 3 images returns 404.
   All this with pagespeed disabled ( url?PageSpeed=unplugged)
   
   All files on `https://subdomain.example.com/pub/static` comes from apache
   ```
   700040-babolat_all.jpg
   dog_dampener.jpg
   logo-etennis.ico
   ```
   returns 404
   
   More strange, image files served with ?PageSpeed=unplugged are not the same 
as served with ?PageSpeedFilters=+debug
   Whit unplugged I have these files with 404, with debug, no. Like a page 
cache with differen code for each url parameter.
   Whit unplugged I get files with etag headers from IPRO, but this no posible, 
pagespeed is disabled..
   
   Image +debug
   
   ![Captura de pantalla 2021-11-16 
211422](https://user-images.githubusercontent.com/22342793/142059171-20fe7c08-d92b-48a2-9970-8ae24cd6af59.jpg)
   
   
   Image unplugged
   
   ![Captura de pantalla 2021-11-16 
211512](https://user-images.githubusercontent.com/22342793/142059289-be6679e4-f83c-477d-9409-a3fe2b89f8a6.jpg)
   
   Don´t have ioweb-served-by
   
   ![Captura de pantalla 2021-11-16 
211554](https://user-images.githubusercontent.com/22342793/142059494-4893e5d8-c4b6-4e40-838d-3939127b0e91.jpg)
   
   
   Image served by apache, so proxy is in place and file is not under nginx 
location
   
   ![Captura de pantalla 2021-11-16 
211622](https://user-images.githubusercontent.com/22342793/142059643-b8934602-7081-4d76-9d3b-cf76e47e29ee.jpg)
   
   Image served unplugged (pagespeed totally off) but have haders from IPRO 
(the etag header)
   
   ![Captura de pantalla 2021-11-16 
211645](https://user-images.githubusercontent.com/22342793/142059832-54e97b5d-eb77-4343-b1a9-e3eb3124070f.jpg)
   
   This make me thinking images are cached somewhere and served with the 
headers they have been stored.
   
   
   


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