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As a user, if I ask for a DOC I want a DOC. If your service gives me a zip, it's not what I asked for. As a programmer, this is quite simple to solve as others have said how (store gzipped and serve with correct headers).

Understood, we will change that.

You can store it gziped on your disks, just add 'Content-Encoding' and 'Content-Type' headers while returning it and remove .zip extension.

fixed

I do conversions like this as part of an app, and I never save to disk - I create the file in memory, and return it directly to the HTTP response as a file download. What stack are you running that makes you save to disk? (Because that also would be a deal-breaker for using this on confidential documents, if you ever allow uploads)

For upload we could do file i/o in memory, our stack allow us. But right now if we did it in memory we would run out of memory.