http client"

Erik Reitsma EJ (RY/ETM) <>
Wed Oct 27 13:06:07 CEST 2004


I have had similar problems with the http client. I tried the client with a web server (pico) that closes the socket immediately after sending the result, even if there is not "Connection: close" header in the request. This makes the http client hang. If make wait for 100 ms before closing the socket, or the closing of the socket by the client, the client works. I have looked into it before, and I think the http client wants to close an already closed sockets, and propagates that "error" in some unexpected way.

*Erik.

> -----Original Message-----
> From: 
> [mailto:]On Behalf Of Ingela Anderton
> Sent: Wednesday, October 27, 2004 11:37 AM
> To: Anastasia Gornostaeva
> Cc: 
> Subject: "Re: http client"
> 
> 
> 
> Well, most of the time it works as expected  when I try it, but I
> actually happened to get the same crash as you got once. I do not
> yet know why, and right now I can not get it to happen again. I
> suspect it might be a timing dependent bug. The parsing of the
> response does not always follow the exact same path through the code,
> it the depends on the rate in which the response is received.
> I will look in to this.
> 
> 1> application:start(inets).
> ok
> 
> 2> http:request(get, {"http://www.compulenta.ru/rss.xml", 
> []}, [], []).
> {ok,{{"HTTP/1.0",200,"OK"},
>      [{"connection","close"},
>       {"content-type","text/xml; charset=windows-1251"},
>       {"date","Wed, 27 Oct 2004 09:19:52 GMT"},
>       {"server","Apache/1.3.29 (Unix) mod_deflate/1.0.21 
> rus/PL30.19"},
>       {"expires","Thu, 01 Jan 1970 00:00:01 GMT"},
>       {"last-modified","Wed, 27 Oct 2004 09:19:52 GMT"}],
>      "<?xml version=\"1.0\" 
> encoding=\"Windows-1251\"?>\n\n<rss 
> version=\"2.0\">\n\n<channel>\n <title>Êîìïüþëåíòà</title>\n 
> <link>http://www.compulenta.ru</link>\n <description>Íîâîñòè 
> êîìïüþòåðíîé èíäóñòðèè, íàóêè è òåõíèêè.</description>\n 
> <image>\n <title>Êîìïüþëåíòà</title>\n 
> <url>http://img.compulenta.ru/clenta/i/bigtitle.gif</url>\n 
> <link>http://www.compulenta.ru</link>\n <width>88</width>\n 
> <height>31</height>\n </image>\n\n\n\n <item>\n 
> <title>Ïîðòàòèâíûé ÌÐ3-ïëååð MPIO FG100 ñ äèçàéíîì 
> ìàãíèòîëû</title>\n 
> <link>http://www.compulenta.ru/2004/10/27/51292/?ref=rss</link
> >\n <description>Îò îäíîé ùåëî÷íîé áàòàðåéêè ñòàíäàðòà ÀÀ 
> íîâèíêà ñïîñîáíà ðàáîòàòü â òå÷åíèå 43 ÷àñîâ.</description>\n 
> <category></category>\n\n <enclosure 
> url=\"http://www.compulenta.ru/pubimages/21979.jpg\" 
> type=\"image/jpeg\"/>\n\n <pubDate>Wed, 27 Oct 2004 09:02:08 
> GMT</pubDate>\n </item>\n\n\n <item>\n <title>Ìîùíûé íîóòáóê 
> IBM ThinkPad G41</title>\n 
> <link>http://www.compulenta.ru/2004/10/27/51296!
> /?ref=rss</link>\n <description>Ëýïòîï, ïîñòðîåííûé íà áàçå 
> ïðîöåññîðà Mobile Intel Pentium 4, ïîñòóïèò â ïðîäàæó ïî öåíå 
> îò 1000 äîëëàðîâ ÑØÀ.</description>\n 
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> url=\"http://www.compulenta.ru/pubimages/21981.jpg\" 
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> äî 600 äîëëàðîâ.</description>\n <category></category>\n\n 
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> type=\"image/jpeg\"/>\n\n <pubDate>Wed, 27 Oct 2004 08:24:05 
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> 27 Oct 2004 08:17:07 GMT</pubDate>\n </item>\n\n\n <item>\n 
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> type=\"image/jpeg\"/>\n\n <pubDate>Wed, 27 Oct 2004 08:07:40 
> GMT</pubDate>\n </item>\n\n\n <item>\n <title>Ericsson 
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> ïåðåäà÷è äàííûõ HSDPA â ñåòè WCDMA ïîçâîëèò óâåëè÷èòü 
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> 9:25 GMT</pubDate>\n </item>\n\n\n <item>\n <title>Îïàñíàÿ óÿçâèìîñòü 
> â ñèñòåìå pGina</title>\n 
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> >\n <description>Äûðà â ñèñòåìå àóòåíòèôèêàöèè ïîçâîëÿåò 
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> 27 Oct 2004 07:40:02 GMT</pubDate>\n </item>\n\n\n <item>\n 
> <title>Western Digital íà÷èíàåò ïîñòàâêè 2,5-äþéìîâûõ æ¸ñòêèõ 
> äèñêîâ</title>\n 
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> </description>\n <category>Æåëåçî/Âèí÷åñòåðû</category>\n\n 
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> type=\"image/jpeg\"/>\n\n <pubDate>Wed, 27 Oct 2004 06:35:23 
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> /?ref=rss</link>\n <description>Òðîÿí ðàçìåðîì îêîëî 19 êá 
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> category>\n\n <enclosure 
> url=\"http://www.compulenta.ru/pubimages/21977.jpg\" 
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> äëÿ õðàíåíèÿ ôàéëîâ â èíòåðíåòå</title>\n 
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> <link>http://www.compulenta.ru/2004/10/26/51280/?ref=rss</link
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> Êåððè çàìàõèâàåòñÿ íà DMCA?</title>\n 
> <link>http://www.compulenta.ru/2004/10/26/51275/?ref=rss</link
> >\n <description>Äæîí Êåððè ñêàçàë, ÷òî îí ìîæåò ïîääåðæàòü 
> âíåñåíèå ñóùåñòâåííûõ "îñëàáëÿþùèõ" ïîïðàâîê â 
> íåïîïóëÿðíûé çàêîí DMCA. </description>\n 
> <category>Ïðàâî/DMCA è CBDTPA</category>\n\n <enclosure 
> url=\"http://www.compulenta.ru/pubimages/21963.jpg\" 
> type=\"image/jpeg\"/>\n\n <pubDate>Tue, 26 Oct 2004 15:14:50 
> GMT</pubDate>\n </item>\n\n\n <item>\n <title>Íîâûé òèï 
> òðàíñëÿöèè öèôðîâîãî êîíòåíòà PodCasting íàáèðàåò 
> îáîðîòû</title>\n <link>http!
> ://www.compulenta.ru/2004/10/26/51267/?ref=rss</link>\n <description>P
> odCasting - ýòî íîâûé ñïîñîá ðàñïðîñòðàíåíèÿ ìóçûêè, â îñíîâå 
> êîòîðãî ëåæèò òåõíîëîãèÿ RSS, òàê ÷òî â òåîðèè íîâûé ìåòîä 
> ïðèãîäåí íå òîëüêî äëÿ òðàíñëÿöèè çâóêà.</description>\n 
> <category>Èíòåðíåò/Èíòåðíåò-ðàäèî</category>\n\n 
> <pubDate>Tue, 26 Oct 2004 14:46:53 GMT</pubDate>\n 
> </item>\n\n\n <item>\n <title>Êóðñ àêöèé Google ñòàâèò íîâûå 
> ðåêîðäû</title>\n 
> <link>http://www.compulenta.ru/2004/10/26/51270/?ref=rss</link
> >\n <description>Ïîñëå îïóáëèêîâàíèÿ êâàðòàëüíîãî îò÷åòà êóðñ 
> öåííûõ áóìàã Google íà áèðæå Nasdaq íà÷àë ðåçêî ðàñòè è â 
> ïîíåäåëüíèê äîñòèã ïèêà â $194,43 çà àêöèþ.</description>\n 
> <category>Èíòåðíåò/Ïîèñêîâûå ñèñòåìû/Google</category>\n\n 
> <enclosure url=\"http://www.compulenta.ru/pubimages/.jpg\" 
> type=\"image/jpeg\"/>\n\n <pubDate>Tue, 26 Oct 2004 14:00:30 
> GMT</pubDate>\n </item>\n\n\n <item>\n <title>GTA 3: San 
> Andreas îçâó÷èëè çâ¸çäû Ãîëëèâóäà</title>\n 
> <link>http://www.compulenta.ru/2004/10/26/51273/?ref=rss</link
> >\n <description>Ñýìþåëü Äæåêñîí, Ice-T, Ïèòåð Ô!
> îíäà è Äæåéìñ Âóäñ - âîò ëèøü ñàìûå ãðîìêèå èìåíà èç ÷èñëà 
> àêò¸ðîâ è ìóçûêàíòîâ, îçâó÷èâàâøèõ íîâóþ èãðó ñåðèè 
> GTA.</description>\n <category>Èãðû/Grand Theft Auto 
> </category>\n\n <enclosure 
> url=\"http://www.compulenta.ru/pubimages/21962.jpg\" 
> type=\"image/jpeg\"/>\n\n <pubDate>Tue, 26 Oct 2004 13:39:22 
> GMT</pubDate>\n </item>\n\n\n <item>\n <title>Â Adobe Reader 
> ïîÿâèòñÿ ïîèñê îò Yahoo</title>\n 
> <link>http://www.compulenta.ru/2004/10/26/51271/?ref=rss</link
> >\n <description>Íîâàÿ ïàíåëü â Adobe Reader ðàñøèðèò 
> ôóíêöèîíàëüíûå âîçìîæíîñòè ïðîãðàììû, ñíàáäèò åå ïîèñêîì îò 
> Yahoo è äîñòóïîì ê îíëàéíîâûì ñåðâèñàì Adobe.</description>\n 
> <category>Áèçíåñ</category>\n\n <pubDate>Tue, 26 Oct 2004 
> 13:11:12 GMT</pubDate>\n </item>\n\n</channel>\n</rss>\n"}}
> 3> 
> 
> 
> > Hello.
> > 
> > 1> application:start(inets).
> > ok
> > 2> http:request(get, {"http://www.compulenta.ru/rss.xml", 
> []}, [], []).
> > 
> > =ERROR REPORT==== 22-Oct-2004::17:02:11 ===
> > ** Generic server <0.44.0> terminating 
> > ** Last message in was {tcp,#Port<0.107>,
> >                             
> <<72,84,84,80,47,49,46,49,32,50,48,48,32,79,75,13,10
> > ...
> > ** Reason for termination == 
> > ** {{badmatch,{noreply,{state,{request,
> >                                   #Ref<0.0.0.225>,
> > ...
> >     [{httpc_handler,handle_http_body,2},
> >      {gen_server,handle_msg,6},
> >      {proc_lib,init_p,5}]}
> > 
> > ahd erlanng shell is locked forewer. Erlang r10b.
> > A simple question: where i'm wrong?
> > Or please advise me a ready-to-use packet for fetching via http/ftp.
> > 
> > ermine
>  
> -- 
> /Ingela
> 
> Ericsson AB - OTP team
> 
> 
> 
> 
> 
> 



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