Re: [Boost-users] asio problem with detecting http header end

Subject: Re: [Boost-users] asio problem with detecting http header end
From: Leo Cacciari (leo.cacciari_at_[hidden])
Date: 2011-07-31 07:09:40

Il 07/30/2011 08:39 PM, Igor R ha scritto:
>> I use Boost.ASIO for receiving Twitter JSON data. I use this code:
>> boost::asio::write( p_socket, l_request );
>>
>> boost::asio::streambuf l_response;
>>
>> boost::asio::read_until(p_socket, l_response, "\r\n\r\n");
> 
> 
> Read the manual:
> http://www.boost.org/doc/libs/1_47_0/doc/html/boost_asio/reference/read_until/overload3.html
> 

I would also suggest that you look to the http server examples in the
documentation. The problem of reading an http response, as your client
should do, is no different  from reading an http request as the server
in the examples does (also parsing it is little different, thus reading
the examples would benefit you for this).

As an aside, let me remark that your approach was flawed also from the
http point of view. Think what would happen if the server, for any
reason whatsoever, sent you a message without a body... The empty line
is intended as a _separator_, not as a _termiantor_ i.e. if there is no
body there is no CRLF alone on its line, because there is nothing to
separate! Thus in that case your call will lock forever waiting for a
sequence which would never come (well, it would not lock truly forever
as the server would close the connection ad you'll end up with an
unexpected connection error, but you still would have problems)

-- 
Leo Cacciari
Aliae nationes servitutem pati possunt populi romani est propria libertas