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Re: Program hanging on recv()

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From	Rainer Weikusat <rweikusat@mssgmbh.com>
Newsgroups	comp.os.linux.development.apps
Subject	Re: Program hanging on recv()
Date	Mon, 04 Feb 2013 19:43:19 +0000
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Ramon <ramif_47.invalid@yahoo.co.uk> writes:
> What I'm actually doing is just downloading an XML page to memory
> using the HTTP
> protocol. (e.g. http://weather.yahooapis.com/forecastrss?w=2502265)

[...]

> *Question*:  Is it possible to know the size of the page to download
> beforehand?

If you're only interested in using the TCP connection for a single
request-reply exchange, send a HTTP1.0 request without a Connection:
header or with Connection: close as connection header and call
shutdown(sockfd, SHUT_WR) on you socket after sending the complete
request. The server is then required/ supposed to mark the end of the
reply by closing the connection so you can just read until EOF.

Otherwise, there are (AFAIK) two additional cases to deal with:

	- length of the content is provided in form a a Content-Length
          header

	- so-called 'chunked transfer coding' (reply is send in chunks
          each of which is preceded by a chunk length)

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Thread

Program hanging on recv() Ramon <ramif_47.invalid@yahoo.co.uk> - 2013-02-03 19:18 +0100
  Re: Program hanging on recv() Richard Kettlewell <rjk@greenend.org.uk> - 2013-02-03 21:38 +0000
    Re: Program hanging on recv() Ramon <ramif_47.invalid@yahoo.co.uk> - 2013-02-03 23:05 +0100
      Re: Program hanging on recv() Lew Pitcher <lpitcher@teksavvy.com> - 2013-02-03 17:50 -0500
      Re: Program hanging on recv() Richard Kettlewell <rjk@greenend.org.uk> - 2013-02-03 23:16 +0000
      Re: Program hanging on recv() Jasen Betts <jasen@xnet.co.nz> - 2013-02-04 11:10 +0000
        Re: Program hanging on recv() Ramon <ramif_47.invalid@yahoo.co.uk> - 2013-02-04 21:21 +0100
      Re: Program hanging on recv() Rainer Weikusat <rweikusat@mssgmbh.com> - 2013-02-04 19:43 +0000

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