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Re: [libmicrohttpd] ZLib & MHD_create_response_from_fd_at_offset64: comp

From: Christian Grothoff
Subject: Re: [libmicrohttpd] ZLib & MHD_create_response_from_fd_at_offset64: compression on demand
Date: Mon, 7 Jan 2019 12:49:04 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.0

Hi Silvio,

Sorry, that won't work. To send compressed replies *and* use sendfile()
the only way would be to have the gzip'ed file already on disk. (You'll
still need to set the right content encoding, and you must then _also_
have an uncompressed version of the file on disk in case a client does
not support compression.)

Happy hacking!


On 1/5/19 12:23 AM, silvioprog wrote:
> Hello dudes,
> firstly, thanks Christian for indicating the MHD_fd* functions, I
> upgraded my library to use them! :-)
> Now I have a new challenge. I'm going to create two new examples for MHD
> (issue #4914), however, I have a question. Is there any chance to use
> zlib to compress data when creating a response via
> MHD_create_response_from_fd_at_offset64()? I tried that, but it seems
> its internal read() cannot  be intercepted (to compress data on demand
> using zlib's compress2()). I would like to "intercept" the internal
> MHD's file_reader() (response.c:572) to reuse it instead of rewriting a
> new one, because the original already handles the reading in any
> supported platform.
> Thanks in advance for any help!
> --
> Silvio Clécio

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