Beast.HTTP:

New classes are introduced to represent HTTP messages and their
associated bodies. The parser interface is reworked to use CRTP,
error codes, and trait checks.

New classes:

* basic_headers

  Models field/value pairs in a HTTP message.

* message

  Models a HTTP message, body behavior defined by template argument.
  Parsed message carries metadata generated during parsing.

* parser

  Produces parsed messages.

* empty_body, string_body, basic_streambuf_body

  Classes used to represent content bodies in various ways.

New functions:

* read, async_read, write, async_write

  Read and write HTTP messages on a socket.

New concepts:

* Body: Represents the HTTP Content-Body.
* Field: A HTTP header field.
* FieldSequence: A forward sequence of fields.
* Reader: Parses a Body from a stream of bytes.
* Writer: Serializes a Body to buffers.

basic_parser changes:

* add write methods which throw exceptions instead
* error_code passed via parameter instead of return value
* fold private member calls into existing callbacks
* basic_parser uses CRTP instead of virtual members
* add documentation on Derived requirements for CRTP

impl/http-parser changes:

* joyent renamed to nodejs to reflect upstream changes

examples/http_crawl.cpp

@@ -0,0 +1,67 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of Beast: https://github.com/vinniefalco/Beast
+    Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#include "http_stream.h"
+#include "urls_large_data.h"
+
+#include <boost/asio.hpp>
+#include <iostream>
+
+using namespace beast::http;
+using namespace boost::asio;
+
+template<class String>
+void
+err(error_code const& ec, String const& what)
+{
+    std::cerr << what << ": " << ec.message() << std::endl;
+}
+
+int main(int, char const*[])
+{
+    io_service ios;
+    for(auto const& host : urls_large_data())
+    {
+        try
+        {
+            ip::tcp::resolver r(ios);
+            auto it = r.resolve(
+                ip::tcp::resolver::query{host, "http"});
+            stream<ip::tcp::socket> hs(ios);
+            connect(hs.lowest_layer(), it);
+            auto ep = hs.lowest_layer().remote_endpoint();
+            request<empty_body> req({method_t::http_get, "/", 11});
+            req.headers.insert("Host", host +
+                std::string(":") + std::to_string(ep.port()));
+            req.headers.insert("User-Agent", "beast/http");
+            hs.write(req);
+            response<string_body> resp;
+            hs.read(resp);
+            std::cout << resp;
+        }
+        catch(boost::system::system_error const& ec)
+        {
+            std::cerr << host << ": " << ec.what();
+        }
+        catch(...)
+        {
+            std::cerr << host << ": unknown exception" << std::endl;
+        }
+    }
+}