slice module not handling 416

[Piers Haken]

i'm trying to use the slice module to cache large files, as described here:

https://guo365.github.io/study/nginx.org/en/docs/admin-guide/Web%20content%20cache.html#slice

however, the slice module _always_ requests the full slice range regardless of the size of the file, and the servers that i'm proxying return "416 The requested range is not satisfiable" which seems to be the correct response as defined in https://tools.ietf.org/html/rfc7233#section-4.4.

I cannot change the behavior of those proxied servers, and i really need this to work. is there something else i can do to work around this?
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