curl-library

From: Serge van den Broek <SVandenbroek_at_isabel.be> Date: Mon, 19 Jul 2004 09:17:20 +0200 · > While sitting here slowly working this into my sources, I miss the man page!

--
Casey O'Donnell
RPI STS Department - Graduate Student
http://homepage.mac.com/codonnell/
http://homepage.mac.com/codonnell/wxblogger/
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Message: 2
Date: Sat, 17 Jul 2004 11:17:47 -0400
From: "Roland Krikava" <list-subs_at_bluedigits.com>
Subject: Re: libcurl - No timeout
To: "libcurl development" <curl-library_at_cool.haxx.se>
Message-ID: <000801c46c11$391ef330$3601a8c0_at_greybird>
Content-Type: text/plain;	charset="iso-8859-1"
----- Original Message ----- 
From: "Daniel Stenberg" <daniel-curl_at_haxx.se>
To: "libcurl development" <curl-library_at_cool.haxx.se>
Sent: Saturday, July 17, 2004 4:02 AM
Subject: Re: libcurl - No timeout
> On Fri, 16 Jul 2004, Roland Krikava wrote:
>
> > The connection will however timeout after a few minutes.
>
> Yes, since Apache will close it down. You could write your own server
though
> that does this and never times out. Neiter will libcurl in that case.
>
> > Any suggestions on how to troubleshoot this, and avoid setting timeouts
that
> > kill legitimate connections?
>
> First off, what is a "legitimate connection" and how can libcurl tell?
If data is available for reading, I would call this legitimate.  Large files
that take a long time to download could outlast any CURLOPT_TIMEOUT.  If,
however, this timeout was used instead to timeout on inactive connections,
this problem would be avoided.
>
> I suggest you either use the CURLOPT_LOW_SPEED_LIMIT option or you use the
> progress callback to figure out yourself when you think the connection is
no
> longer interesting.
I will look into it, thanks.
>
> -- 
>       Daniel Stenberg -- http://curl.haxx.se -- http://daniel.haxx.se
>        Dedicated custom curl help for hire: http://haxx.se/curl.html
>
>
------------------------------
Message: 3
Date: Sat, 17 Jul 2004 11:47:40 -0400
From: "Roland Krikava" <list-subs_at_bluedigits.com>
Subject: libcurl - Script to create ca-bundle.crt from Mozilla's
	certdata.txt
To: "libcurl development" <curl-library_at_cool.haxx.se>
Message-ID: <001c01c46c15$65b1ca40$3601a8c0_at_greybird>
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Message: 4
Date: Sun, 18 Jul 2004 09:28:54 +0200 (CEST)
From: Daniel Stenberg <daniel-curl_at_haxx.se>
Subject: Re: libcurl - No timeout
To: libcurl development <curl-library_at_cool.haxx.se>
Message-ID: <Pine.LNX.4.60.0407180921590.6299_at_yvahk3.pbagnpgbe.fr>
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
On Sat, 17 Jul 2004, Roland Krikava wrote:
>> First off, what is a "legitimate connection" and how can libcurl tell?
>
> If data is available for reading, I would call this legitimate.
Data is not available all the time, hardly on any connections. There are 
always periods when no data is available. The lengths of those periods can of 
course vary between milliseconds to hours, days or even weeks. The periods of 
no-data-available doesn't make the connection ilegitimate, only slow.
> Large files that take a long time to download could outlast any 
> CURLOPT_TIMEOUT.
Of course, CURLOPT_TIMEOUT is a very rough tool.
> If, however, this timeout was used instead to timeout on inactive 
> connections, this problem would be avoided.
So what is an "inactive connection" ? libcurl can't tell if the server is 
slow, the network is slow or if the server actually decided to stop sending 
data (without disconnecting).
But then, libcurl offers a method to kill connections with very little 
through-put, if you think that is a good idea. Or you can do your own 
heuristics in one of the callbcks libcurl calls.
-- 
      Daniel Stenberg -- http://curl.haxx.se -- http://daniel.haxx.se
       Dedicated custom curl help for hire: http://haxx.se/curl.html
------------------------------
Message: 5
Date: Sun, 18 Jul 2004 09:30:40 +0200 (CEST)
From: Daniel Stenberg <daniel-curl_at_haxx.se>
Subject: Re: curl_easy_perform
To: libcurl development <curl-library_at_cool.haxx.se>
Message-ID: <Pine.LNX.4.60.0407180723520.6299_at_yvahk3.pbagnpgbe.fr>
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
On Sat, 17 Jul 2004, Karl wrote:
> When using threads and libcurl, if one thread is running curl_easy_perform 
> and for whatever reason that takes some time (say host not responding), can 
> another thread terminate that attempt
No. But a thread can signal the other thread and then you can make your 
callback(s) return to abort the transfer. It will at least make the transfer 
stop as soon as possible.
> , or do we have to wait for the perform to fail.
Return the proper code from your callback and it'll stop.
-- 
      Daniel Stenberg -- http://curl.haxx.se -- http://daniel.haxx.se
       Dedicated custom curl help for hire: http://haxx.se/curl.html
------------------------------
Message: 6
Date: Sun, 18 Jul 2004 09:36:37 +0200 (CEST)
From: Daniel Stenberg <daniel-curl_at_haxx.se>
Subject: Re: curl-multi: Pausing download with connection open
To: libcurl development <curl-library_at_cool.haxx.se>
Message-ID: <Pine.LNX.4.60.0407180931580.6299_at_yvahk3.pbagnpgbe.fr>
Content-Type: TEXT/PLAIN; CHARSET=US-ASCII; FORMAT=flowed
On Sat, 17 Jul 2004, Richard Atterer wrote:
>> I'm open for suggestions and patches on how such a pausing would be 
>> controlled.
>
> Hmm, libcurl could maintain a "paused" flag for each easy handle, and when 
> that flag is set, the handle's sockets could no longer be returned in the 
> fd_set result of curl_multi_fdset().
Yes that would work, and then connections marked as paused wouldn't be checked 
for receiving or sending data.
> Also, it's possible that the application will run out of connections sooner 
> if there's some kind of limit... What does CURLOPT_MAXCONNECTS apply to, 
> overall open connections, connections to a single host, or overall open, but 
> unused connections?
Maximum number of open connections in an easy handle's connection "pool". They 
are used to allow connection re-use when subsequent requests are made.
-- 
      Daniel Stenberg -- http://curl.haxx.se -- http://daniel.haxx.se
       Dedicated custom curl help for hire: http://haxx.se/curl.html
------------------------------
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