I have a request:

http://test.dev/imgheaders/<img_hash>/<img_serialize>

What I want to achieve is, get from location <img_hash>, and check if
file exists, if it exists then serve the file. if file not exists pass
<img_serialize> to php fastcgi script and it will return the image.

Any suggestions on how to achieve this?

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Best regards
Tomasz Pajor