So the questions - is it possible to serve partial http requests in mod_perl handlers?
Absolutely, there is nothing special about partial requests
If yes, can you give a hint on what module does it (in order to see how it implements it)?
Read the RFC. A client requests a range of bytes, the server (your handler) sends the bytes requested, or returns an error, all with the required headers (refer to the RFC for those).
The biggest problems I see is forcing apache to return proper status code and accept my Content-Range headers.
Why? Just try it.
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