[openssl-users] BIO_read hangs, how can I know if the server wants to send data?

Hanno Böck hanno at hboeck.de
Tue Apr 26 16:48:08 UTC 2016

On Tue, 26 Apr 2016 18:31:31 +0200
Rainer Jung <rainer.jung at kippdata.de> wrote:

> The second pattern looks like "Transfer-Encoding: chunked". In this 
> mode, a response is sent in chunks and each chunk is preceded by a
> hex number telling how big the next chunk is. The last chunk is
> followed by a "0" indicating no more chunks are expected. So the "2"
> is the size of the chunk size (two hex digits), next comes the chunk
> itself.
> That sort of encoding is typically used for dynamic content, when the 
> final size of the response is not known in advance to avoid needing
> to buffer the whole response before sending it. It does not use a 
> content-length header. Another case might be a transformation during 
> response delivery that changes the size in a way that is not easy to 
> calculate in advance, like compression.

Thanks, that was it. if I look at the data coming that's exactly how it
looks like. (I still wonder why apache does that - for a 404 error
page - but at least now I know what's going on)

Hanno Böck

mail/jabber: hanno at hboeck.de
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