fixed error handling and added support for relative http redirects (which aren't allowed by the standard)

include/libtorrent/http_connection.hpp

@@ -158,6 +158,7 @@ private:
 	bool m_called;
 	std::string m_hostname;
 	std::string m_port;
+	std::string m_url;
 
 	// the current download limit, in bytes per second
 	// 0 is unlimited.

src/http_connection.cpp

@@ -114,6 +114,7 @@ void http_connection::get(std::string const& url, time_duration timeout, int pri
 		"\r\n";
 
 	sendbuffer = headers.str();
+	m_url = url;
 	start(hostname, boost::lexical_cast<std::string>(port), timeout, prio
 		, ps, ssl, handle_redirects, bind_addr);
 }
@@ -417,17 +418,44 @@ void http_connection::on_read(error_code const& e
 			if (code >= 300 && code < 400)
 			{
 				// attempt a redirect
-				std::string const& url = m_parser.header("location");
-				if (url.empty())
+				std::string const& location = m_parser.header("location");
+				if (location.empty())
 				{
 					// missing location header
-					callback(e);
+					callback(asio::error::fault);
+					close();
 					return;
 				}
 
 				error_code ec;
 				m_sock.close(ec);
+				using boost::tuples::ignore;
+				char const* error;
+				boost::tie(ignore, ignore, ignore, ignore, ignore, error)
+					= parse_url_components(location);
+				if (error == 0)
+				{
+					get(location, m_timeout, m_priority, &m_proxy, m_redirects - 1);
+				}
+				else
+				{
+					// some broken web servers send out relative paths
+					// in the location header.
+					std::string url = m_url;
+					// remove the leaf filename
+					std::size_t i = url.find_last_of('/');
+					if (i == std::string::npos)
+					{
+						url += '/';
+					}
+					else
+					{
+						url.resize(i + 1);
+					}
+					url += location;
+
 					get(url, m_timeout, m_priority, &m_proxy, m_redirects - 1);
+				}
 				return;
 			}
 	

test/setup_transfer.cpp

@@ -97,10 +97,11 @@ void start_web_server(int port, bool ssl)
 		"server.range-requests = \"enable\"\n"
 		"server.port = " << port << "\n"
 		"server.pid-file = \"./lighty" << port << ".pid\"\n"
-		"url.redirect = (\"^/redirect$\" => \""
-			<< (ssl?"https":"http") << "://127.0.0.1:" << port << "/test_file\", "
-			"\"^/infinite_redirect$\" => \""
-			<< (ssl?"https":"http") << "://127.0.0.1:" << port << "/infinite_redirect\")\n"
+		"url.redirect = ("
+			"\"^/redirect$\" => \"" << (ssl?"https":"http") << "://127.0.0.1:" << port << "/test_file\""
+			", \"^/infinite_redirect$\" => \"" << (ssl?"https":"http") << "://127.0.0.1:" << port << "/infinite_redirect\""
+			", \"^/relative/redirect$\" => \"../test_file\""
+			")\n"
 		"$HTTP[\"url\"] == \"/test_file.gz\" {\n"
 		"    setenv.add-response-header = ( \"Content-Encoding\" => \"gzip\" )\n"
 		"#    mimetype.assign = ()\n"

test/test_http_connection.cpp

@@ -104,6 +104,7 @@ void run_suite(std::string const& protocol, proxy_settings const& ps)
 		<< " proxy **********************\n" << std::endl;
 
 	typedef boost::optional<error_code> err;
+	run_test(protocol + "://127.0.0.1:8001/relative/redirect", 3216, 200, 2, error_code(), ps);
 	run_test(protocol + "://127.0.0.1:8001/redirect", 3216, 200, 2, error_code(), ps);
 	run_test(protocol + "://127.0.0.1:8001/infinite_redirect", 0, 301, 6, error_code(), ps);
 	run_test(protocol + "://127.0.0.1:8001/test_file", 3216, 200, 1, error_code(), ps);