[erlang-questions] gen_tcp very slow to fetch data

zabrane Mikael <>
Sat Nov 21 01:15:03 CET 2009


Thanks Robert. I just made a quick copy/past for the post and I forgot the
"~p" ;-)
So my problem is still there if you can help !!

2009/11/21 Robert Virding <>

> The call to io:format is wrong as it is missing an argument to print with
> ~p. So it will print the "BinData: " leader and then crash. I am guessing
> you meant it to be:
>
> io:fornat("BinData: ~p~n", [BinData]),
>
> You should have got a warning from the compiler.
>
> Robert
>
> 2009/11/21 zabrane Mikael <>
>
>> Hi List !
>>
>> While trying to learn how to write a simple TCP Web Server in Erlang which
>> only dump what it gets to stdout, I realize that time to time, the HTTP
>> requests get truncated when reaching the server. My main socket loop looks
>> like:
>>
>> -------------------------------------------
>> -define(TCP_OPTIONS,[binary, {packet, 0}, {active, false}, {reuseaddr,
>> true}]).
>> ...
>> loop_recv(Socket)
>>   case gen_tcp:recv(Socket, 0) of
>>        {ok, BinData} ->
>>             %% here, I'm assuming that all the HTTP request (Headers +
>> Body) is in "BinData". Hope I'm right.
>>             io:format("BinData: ~p~n", []),
>>             ok;
>>        NotOK ->
>>            error_logger:info_report([{"gen_tcp:recv/2", NotOK}]),
>>            error
>>    end.
>> -------------------------------------------
>>
>> For some requests, the "io:format" prints a truncated data (in BinData):
>>
>> <<"
>>
>> http://www.foo.tv/images/v30/LoaderV3.swf?loop=false&quality=high&request=357&HTTP/1.0
>> \r\nHost:
>> www.foo.tv\r\nUser-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5;
>> fr; rv:1.9.0.2) Gecko/2008090512 Firefox/3.0.2\r\nAccept: text/h">>
>>
>> As you can see, the request isn't complete "... Accept: text/h".
>>
>> Am I doing somthing wrong? How can I fix it please?
>>
>> Regards
>> Zabrane
>>
>>


More information about the erlang-questions mailing list