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POBoost ASIO async_read_some
 

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  1. POBoost ASIO async_read_some
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    <p>I am having difficulties in implementing a simple TCP server. The following code is taken from <a href="http://www.boost.org/doc/libs/1_49_0/doc/html/boost_asio/examples.html" rel="nofollow">boost::asio examples</a>, "Http Server 1" to be precise.</p> <pre><code>void connection::start() { socket_.async_read_some( boost::asio::buffer(buffer_), boost::bind( &amp;connection::handle_read, shared_from_this(), boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred ) ); } void connection::handle_read(const boost::system::error_code&amp; e, std::size_t bytes_transferred) { if (!e &amp;&amp; bytes_transferred) { std::cout &lt;&lt; " " &lt;&lt; bytes_transferred &lt;&lt;"b" &lt;&lt; std::endl; data_.append(buffer_.data(), buffer_.data()+bytes_transferred); //(1) what here? socket_.async_read_some( boost::asio::buffer(buffer_), boost::bind( &amp;connection::handle_read, shared_from_this(), boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred ) ); } else// if (e != boost::asio::error::operation_aborted) { std::cout &lt;&lt; data_ &lt;&lt; std::endl; connection_manager_.stop(shared_from_this()); } } </code></pre> <p>In the original code the <code>buffer_</code> is big enough to keep the entire request. It's not what I need. I've changed the size to 32bytes. </p> <p>The server compiles and listens at port 80 of localhost, so I try to connect to it via my web browser.</p> <p>Now if the statement (1) is commented-out, then only the first 32bytes of the request are read and the connection hangs. Web browser keeps waiting for the response, the server does.. I dont know what.</p> <p>If (1) is uncommented, then the entire request is read (and appeded to <code>data_</code>), but it never stops - I have to cancel the request in my browser and only then does the <code>else { }</code> part run - I see my request on stdout.</p> <p><strong>Question 1:</strong> How should I handle a large request?<br/> <strong>Question 2:</strong> How should I cache the request (currently I append the buffer to a string)?<br/> <strong>Question 3:</strong> How can I tell that the request is over? In HTTP there always is a response, so my web-browser keeps waiting for it and doesnt close the connection, but how can my server know that the request is over (and perhaps close it or reply some "200 OK")?</p>
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