image_filter_jpeg_quality based on size

Antonio P.P. Almeida appa at
Tue Mar 20 09:08:55 UTC 2012

> Let me rephrase my Q :-)
> Can I find out the file size in a location directive?
> -Quintin

Using set_by_lua (

location ~* \.(?:gif|jpe?g|png)$ {
    set_by_lua $img_file_size '
      function fsize (file)
        local current = file:seek()      -- get current position
        local size = file:seek("end")    -- get file size
        file:seek("set", current)        -- restore position
        return size

Untested. This will give you the file size on the variable $img_file_size.


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