tikhomirov@687: /*
tikhomirov@687:  * Copyright (c) 2013 TMate Software Ltd
tikhomirov@687:  *  
tikhomirov@687:  * This program is free software; you can redistribute it and/or modify
tikhomirov@687:  * it under the terms of the GNU General Public License as published by
tikhomirov@687:  * the Free Software Foundation; version 2 of the License.
tikhomirov@687:  *
tikhomirov@687:  * This program is distributed in the hope that it will be useful,
tikhomirov@687:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
tikhomirov@687:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
tikhomirov@687:  * GNU General Public License for more details.
tikhomirov@687:  *
tikhomirov@687:  * For information on how to redistribute this software under
tikhomirov@687:  * the terms of a license other than GNU General Public License
tikhomirov@687:  * contact TMate Software at support@hg4j.com
tikhomirov@687:  */
tikhomirov@687: package org.tmatesoft.hg.internal.remote;
tikhomirov@687: 
tikhomirov@687: import static org.tmatesoft.hg.util.LogFacility.Severity.Info;
tikhomirov@687: 
tikhomirov@687: import java.io.BufferedReader;
tikhomirov@697: import java.io.ByteArrayInputStream;
tikhomirov@687: import java.io.FilterOutputStream;
tikhomirov@687: import java.io.IOException;
tikhomirov@687: import java.io.InputStream;
tikhomirov@687: import java.io.InputStreamReader;
tikhomirov@687: import java.io.OutputStream;
tikhomirov@697: import java.io.SequenceInputStream;
tikhomirov@687: import java.net.HttpURLConnection;
tikhomirov@687: import java.net.MalformedURLException;
tikhomirov@687: import java.net.URL;
tikhomirov@687: import java.net.URLConnection;
tikhomirov@687: import java.security.cert.CertificateException;
tikhomirov@687: import java.security.cert.X509Certificate;
tikhomirov@687: import java.util.Collection;
tikhomirov@687: import java.util.List;
tikhomirov@687: import java.util.Map;
tikhomirov@687: import java.util.prefs.BackingStoreException;
tikhomirov@687: import java.util.prefs.Preferences;
tikhomirov@687: 
tikhomirov@687: import javax.net.ssl.HttpsURLConnection;
tikhomirov@687: import javax.net.ssl.SSLContext;
tikhomirov@687: import javax.net.ssl.TrustManager;
tikhomirov@687: import javax.net.ssl.X509TrustManager;
tikhomirov@687: 
tikhomirov@687: import org.tmatesoft.hg.core.HgRemoteConnectionException;
tikhomirov@687: import org.tmatesoft.hg.core.Nodeid;
tikhomirov@687: import org.tmatesoft.hg.core.SessionContext;
tikhomirov@687: import org.tmatesoft.hg.internal.PropertyMarshal;
tikhomirov@687: import org.tmatesoft.hg.repo.HgRemoteRepository.Range;
tikhomirov@687: import org.tmatesoft.hg.repo.HgRuntimeException;
tikhomirov@687: 
tikhomirov@687: /**
tikhomirov@687:  * 
tikhomirov@687:  * @author Artem Tikhomirov
tikhomirov@687:  * @author TMate Software Ltd.
tikhomirov@687:  */
tikhomirov@687: public class HttpConnector implements Connector {
tikhomirov@687: 	private URL url;
tikhomirov@687: 	private SSLContext sslContext;
tikhomirov@687: 	private String authInfo;
tikhomirov@687: 	private boolean debug;
tikhomirov@687: 	private SessionContext sessionCtx;
tikhomirov@687: 	//
tikhomirov@687: 	private HttpURLConnection conn;
tikhomirov@687: 
tikhomirov@687: 	public void init(URL url, SessionContext sessionContext, Object globalConfig) throws HgRuntimeException {
tikhomirov@687: 		this.url = url;
tikhomirov@687: 		sessionCtx = sessionContext;
tikhomirov@687: 		debug = new PropertyMarshal(sessionCtx).getBoolean("hg4j.remote.debug", false);
tikhomirov@687: 		if (url.getUserInfo() != null) {
tikhomirov@687: 			String ai = null;
tikhomirov@687: 			try {
tikhomirov@687: 				// Hack to get Base64-encoded credentials
tikhomirov@687: 				Preferences tempNode = Preferences.userRoot().node("xxx");
tikhomirov@687: 				tempNode.putByteArray("xxx", url.getUserInfo().getBytes());
tikhomirov@687: 				ai = tempNode.get("xxx", null);
tikhomirov@687: 				tempNode.removeNode();
tikhomirov@687: 			} catch (BackingStoreException ex) {
tikhomirov@687: 				sessionContext.getLog().dump(getClass(), Info, ex, null);
tikhomirov@687: 				// IGNORE
tikhomirov@687: 			}
tikhomirov@687: 			authInfo = ai;
tikhomirov@687: 		} else {
tikhomirov@687: 			authInfo = null;
tikhomirov@687: 		}
tikhomirov@687: 	}
tikhomirov@687: 	
tikhomirov@687: 	public void connect() throws HgRemoteConnectionException, HgRuntimeException {
tikhomirov@687: 		if ("https".equals(url.getProtocol())) {
tikhomirov@687: 			try {
tikhomirov@687: 				sslContext = SSLContext.getInstance("SSL");
tikhomirov@687: 				class TrustEveryone implements X509TrustManager {
tikhomirov@687: 					public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
tikhomirov@687: 						if (debug) {
tikhomirov@687: 							System.out.println("checkClientTrusted:" + authType);
tikhomirov@687: 						}
tikhomirov@687: 					}
tikhomirov@687: 					public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
tikhomirov@687: 						if (debug) {
tikhomirov@687: 							System.out.println("checkServerTrusted:" + authType);
tikhomirov@687: 						}
tikhomirov@687: 					}
tikhomirov@687: 					public X509Certificate[] getAcceptedIssuers() {
tikhomirov@687: 						return new X509Certificate[0];
tikhomirov@687: 					}
tikhomirov@687: 				};
tikhomirov@687: 				sslContext.init(null, new TrustManager[] { new TrustEveryone() }, null);
tikhomirov@687: 			} catch (Exception ex) {
tikhomirov@687: 				throw new HgRemoteConnectionException("Can't initialize secure connection", ex);
tikhomirov@687: 			}
tikhomirov@687: 		} else {
tikhomirov@687: 			sslContext = null;
tikhomirov@687: 		}
tikhomirov@687: 	}
tikhomirov@687: 
tikhomirov@687: 	public void disconnect() throws HgRemoteConnectionException, HgRuntimeException {
tikhomirov@687: 		// TODO Auto-generated method stub
tikhomirov@687: 
tikhomirov@687: 	}
tikhomirov@687: 
tikhomirov@687: 	public void sessionBegin() throws HgRemoteConnectionException, HgRuntimeException {
tikhomirov@687: 		// TODO Auto-generated method stub
tikhomirov@687: 
tikhomirov@687: 	}
tikhomirov@687: 
tikhomirov@687: 	public void sessionEnd() throws HgRemoteConnectionException, HgRuntimeException {
tikhomirov@687: 		if (conn != null) {
tikhomirov@687: 			conn.disconnect();
tikhomirov@687: 			conn = null;
tikhomirov@687: 		}
tikhomirov@687: 	}
tikhomirov@687: 	
tikhomirov@687: 	public String getServerLocation() {
tikhomirov@687: 		if (url.getUserInfo() == null) {
tikhomirov@687: 			return url.toExternalForm();
tikhomirov@687: 		}
tikhomirov@687: 		if (url.getPort() != -1) {
tikhomirov@687: 			return String.format("%s://%s:%d%s", url.getProtocol(), url.getHost(), url.getPort(), url.getPath());
tikhomirov@687: 		} else {
tikhomirov@687: 			return String.format("%s://%s%s", url.getProtocol(), url.getHost(), url.getPath());
tikhomirov@687: 		}
tikhomirov@687: 	}
tikhomirov@687: 
tikhomirov@687: 	public String getCapabilities() throws HgRemoteConnectionException {
tikhomirov@687: 		// say hello to server, check response
tikhomirov@687: 		try {
tikhomirov@687: 			URL u = new URL(url, url.getPath() + "?cmd=hello");
tikhomirov@687: 			HttpURLConnection c = setupConnection(u.openConnection());
tikhomirov@687: 			c.connect();
tikhomirov@687: 			if (debug) {
tikhomirov@687: 				dumpResponseHeader(u);
tikhomirov@687: 			}
tikhomirov@687: 			BufferedReader r = new BufferedReader(new InputStreamReader(c.getInputStream(), "US-ASCII"));
tikhomirov@687: 			String line = r.readLine();
tikhomirov@687: 			c.disconnect();
tikhomirov@687: 			final String capsPrefix = CMD_CAPABILITIES + ':';
tikhomirov@687: 			if (line != null && line.startsWith(capsPrefix)) {
tikhomirov@687: 				return line.substring(capsPrefix.length()).trim();
tikhomirov@687: 			}
tikhomirov@687: 			// for whatever reason, some servers do not respond to hello command (e.g. svnkit)
tikhomirov@687: 			// but respond to 'capabilities' instead. Try it.
tikhomirov@687: 			// TODO [post-1.0] tests needed
tikhomirov@687: 			u = new URL(url, url.getPath() + "?cmd=capabilities");
tikhomirov@687: 			c = setupConnection(u.openConnection());
tikhomirov@687: 			c.connect();
tikhomirov@687: 			if (debug) {
tikhomirov@687: 				dumpResponseHeader(u);
tikhomirov@687: 			}
tikhomirov@687: 			r = new BufferedReader(new InputStreamReader(c.getInputStream(), "US-ASCII"));
tikhomirov@687: 			line = r.readLine();
tikhomirov@687: 			c.disconnect();
tikhomirov@687: 			if (line != null && line.startsWith(capsPrefix)) {
tikhomirov@687: 				return line.substring(capsPrefix.length()).trim();
tikhomirov@687: 			}
tikhomirov@687: 			return new String();
tikhomirov@687: 		} catch (MalformedURLException ex) {
tikhomirov@687: 			throw new HgRemoteConnectionException("Bad URL", ex).setRemoteCommand(CMD_HELLO).setServerInfo(getServerLocation());
tikhomirov@687: 		} catch (IOException ex) {
tikhomirov@687: 			throw new HgRemoteConnectionException("Communication failure", ex).setRemoteCommand(CMD_HELLO).setServerInfo(getServerLocation());
tikhomirov@687: 		}
tikhomirov@687: 	}
tikhomirov@687: 
tikhomirov@687: 	public InputStream heads() throws HgRemoteConnectionException, HgRuntimeException {
tikhomirov@687: 		try {
tikhomirov@687: 			URL u = new URL(url, url.getPath() + "?cmd=heads");
tikhomirov@687: 			conn = setupConnection(u.openConnection());
tikhomirov@687: 			conn.connect();
tikhomirov@687: 			if (debug) {
tikhomirov@687: 				dumpResponseHeader(u);
tikhomirov@687: 			}
tikhomirov@687: 			return conn.getInputStream();
tikhomirov@687: 		} catch (MalformedURLException ex) {
tikhomirov@687: 			throw new HgRemoteConnectionException("Bad URL", ex).setRemoteCommand(CMD_HEADS).setServerInfo(getServerLocation());
tikhomirov@687: 		} catch (IOException ex) {
tikhomirov@687: 			throw new HgRemoteConnectionException("Communication failure", ex).setRemoteCommand(CMD_HEADS).setServerInfo(getServerLocation());
tikhomirov@687: 		}
tikhomirov@687: 	}
tikhomirov@687: 
tikhomirov@687: 	public InputStream between(Collection<Range> ranges) throws HgRemoteConnectionException, HgRuntimeException {
tikhomirov@687: 		StringBuilder sb = new StringBuilder(20 + ranges.size() * 82);
tikhomirov@687: 		sb.append("pairs=");
tikhomirov@687: 		for (Range r : ranges) {
tikhomirov@687: 			r.append(sb);
tikhomirov@687: 			sb.append('+');
tikhomirov@687: 		}
tikhomirov@687: 		if (sb.charAt(sb.length() - 1) == '+') {
tikhomirov@687: 			// strip last space 
tikhomirov@687: 			sb.setLength(sb.length() - 1);
tikhomirov@687: 		}
tikhomirov@687: 		try {
tikhomirov@687: 			boolean usePOST = ranges.size() > 3;
tikhomirov@687: 			URL u = new URL(url, url.getPath() + "?cmd=between" + (usePOST ? "" : '&' + sb.toString()));
tikhomirov@687: 			conn = setupConnection(u.openConnection());
tikhomirov@687: 			if (usePOST) {
tikhomirov@687: 				conn.setRequestMethod("POST");
tikhomirov@687: 				conn.setRequestProperty("Content-Length", String.valueOf(sb.length()/*nodeids are ASCII, bytes == characters */));
tikhomirov@687: 				conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
tikhomirov@687: 				conn.setDoOutput(true);
tikhomirov@687: 				conn.connect();
tikhomirov@687: 				OutputStream os = conn.getOutputStream();
tikhomirov@687: 				os.write(sb.toString().getBytes());
tikhomirov@687: 				os.flush();
tikhomirov@687: 				os.close();
tikhomirov@687: 			} else {
tikhomirov@687: 				conn.connect();
tikhomirov@687: 			}
tikhomirov@687: 			if (debug) {
tikhomirov@687: 				System.out.printf("%d ranges, method:%s \n", ranges.size(), conn.getRequestMethod());
tikhomirov@687: 				dumpResponseHeader(u);
tikhomirov@687: 			}
tikhomirov@687: 			return conn.getInputStream();
tikhomirov@687: 		} catch (MalformedURLException ex) {
tikhomirov@687: 			throw new HgRemoteConnectionException("Bad URL", ex).setRemoteCommand(CMD_BETWEEN).setServerInfo(getServerLocation());
tikhomirov@687: 		} catch (IOException ex) {
tikhomirov@687: 			throw new HgRemoteConnectionException("Communication failure", ex).setRemoteCommand(CMD_BETWEEN).setServerInfo(getServerLocation());
tikhomirov@687: 		}
tikhomirov@687: 	}
tikhomirov@687: 
tikhomirov@687: 	public InputStream branches(List<Nodeid> nodes) throws HgRemoteConnectionException, HgRuntimeException {
tikhomirov@687: 		StringBuilder sb = appendNodeidListArgument("nodes", nodes, null);
tikhomirov@687: 		try {
tikhomirov@687: 			URL u = new URL(url, url.getPath() + "?cmd=branches&" + sb.toString());
tikhomirov@687: 			conn = setupConnection(u.openConnection());
tikhomirov@687: 			conn.connect();
tikhomirov@687: 			if (debug) {
tikhomirov@687: 				dumpResponseHeader(u);
tikhomirov@687: 			}
tikhomirov@687: 			return conn.getInputStream();
tikhomirov@687: 		} catch (MalformedURLException ex) {
tikhomirov@687: 			throw new HgRemoteConnectionException("Bad URL", ex).setRemoteCommand(CMD_BRANCHES).setServerInfo(getServerLocation());
tikhomirov@687: 		} catch (IOException ex) {
tikhomirov@687: 			throw new HgRemoteConnectionException("Communication failure", ex).setRemoteCommand(CMD_BRANCHES).setServerInfo(getServerLocation());
tikhomirov@687: 		}
tikhomirov@687: 	}
tikhomirov@687: 
tikhomirov@687: 	public InputStream changegroup(List<Nodeid> roots) throws HgRemoteConnectionException, HgRuntimeException {
tikhomirov@687: 		StringBuilder sb = appendNodeidListArgument("roots", roots, null);
tikhomirov@687: 		try {
tikhomirov@687: 			URL u = new URL(url, url.getPath() + "?cmd=changegroup&" + sb.toString());
tikhomirov@687: 			conn = setupConnection(u.openConnection());
tikhomirov@687: 			conn.connect();
tikhomirov@687: 			if (debug) {
tikhomirov@687: 				dumpResponseHeader(u);
tikhomirov@687: 			}
tikhomirov@697: 			InputStream cg = conn.getInputStream();
tikhomirov@697: 			InputStream prefix = new ByteArrayInputStream("HG10GZ".getBytes()); // didn't see any other that zip
tikhomirov@697: 			return new SequenceInputStream(prefix, cg);
tikhomirov@697: 		} catch (MalformedURLException ex) {
tikhomirov@697: 			// although there's little user can do about this issue (URLs are constructed by our code)
tikhomirov@697: 			// it's still better to throw it as checked exception than RT because url is likely malformed due to parameters
tikhomirov@697: 			// and this may help user to understand the cause (and e.g. change them)
tikhomirov@687: 			throw new HgRemoteConnectionException("Bad URL", ex).setRemoteCommand("changegroup").setServerInfo(getServerLocation());
tikhomirov@687: 		} catch (IOException ex) {
tikhomirov@687: 			throw new HgRemoteConnectionException("Communication failure", ex).setRemoteCommand("changegroup").setServerInfo(getServerLocation());
tikhomirov@687: 		}
tikhomirov@687: 	}
tikhomirov@687: 
tikhomirov@687: 	//
tikhomirov@687: 	// FIXME consider HttpURLConnection#setChunkedStreamingMode() as described at
tikhomirov@687: 	// http://stackoverflow.com/questions/2793150/how-to-use-java-net-urlconnection-to-fire-and-handle-http-requests
tikhomirov@687: 	public OutputStream unbundle(long outputLen, List<Nodeid> remoteHeads) throws HgRemoteConnectionException, HgRuntimeException {
tikhomirov@687: 		StringBuilder sb = appendNodeidListArgument(CMD_HEADS, remoteHeads, null);
tikhomirov@687: 		try {
tikhomirov@687: 			final URL u = new URL(url, url.getPath() + "?cmd=unbundle&" + sb.toString());
tikhomirov@687: 			conn = setupConnection(u.openConnection());
tikhomirov@687: 			conn.setRequestMethod("POST");
tikhomirov@687: 			conn.setDoOutput(true);
tikhomirov@687: 			conn.setRequestProperty("Content-Type", "application/mercurial-0.1");
tikhomirov@687: 			conn.setRequestProperty("Content-Length", String.valueOf(outputLen));
tikhomirov@687: 			conn.connect();
tikhomirov@687: 			return new FilterOutputStream(conn.getOutputStream()) {
tikhomirov@687: 				public void close() throws IOException {
tikhomirov@687: 					super.close();
tikhomirov@687: 					if (debug) {
tikhomirov@687: 						dumpResponseHeader(u);
tikhomirov@687: 						dumpResponse();
tikhomirov@687: 					}
tikhomirov@687: 					try {
tikhomirov@687: 						checkResponseOk("Push", CMD_UNBUNDLE);
tikhomirov@687: 					} catch (HgRemoteConnectionException ex) {
tikhomirov@687: 						IOException e = new IOException(ex.getMessage());
tikhomirov@687: 						// not e.initCause(ex); as HgRemoteConnectionException is just a message holder
tikhomirov@687: 						e.setStackTrace(ex.getStackTrace());
tikhomirov@687: 						throw e;
tikhomirov@687: 					}
tikhomirov@687: 				}
tikhomirov@687: 			};
tikhomirov@687: 		} catch (MalformedURLException ex) {
tikhomirov@687: 			throw new HgRemoteConnectionException("Bad URL", ex).setRemoteCommand(CMD_UNBUNDLE).setServerInfo(getServerLocation());
tikhomirov@687: 		} catch (IOException ex) {
tikhomirov@687: 			// FIXME consume c.getErrorStream as http://docs.oracle.com/javase/6/docs/technotes/guides/net/http-keepalive.html suggests
tikhomirov@687: 			throw new HgRemoteConnectionException("Communication failure", ex).setRemoteCommand(CMD_UNBUNDLE).setServerInfo(getServerLocation());
tikhomirov@687: 		}
tikhomirov@687: 	}
tikhomirov@687: 
tikhomirov@687: 	public InputStream pushkey(String opName, String namespace, String key, String oldValue, String newValue) throws HgRemoteConnectionException, HgRuntimeException {
tikhomirov@687: 		try {
tikhomirov@687: 			final String p = String.format("%s?cmd=pushkey&namespace=%s&key=%s&old=%s&new=%s", url.getPath(), namespace, key, oldValue, newValue);
tikhomirov@687: 			URL u = new URL(url, p);
tikhomirov@687: 			conn = setupConnection(u.openConnection());
tikhomirov@687: 			conn.setRequestMethod("POST");
tikhomirov@687: 			conn.connect();
tikhomirov@687: 			if (debug) {
tikhomirov@687: 				dumpResponseHeader(u);
tikhomirov@687: 			}
tikhomirov@687: 			checkResponseOk(opName, "pushkey");
tikhomirov@687: 			return conn.getInputStream();
tikhomirov@687: 		} catch (MalformedURLException ex) {
tikhomirov@687: 			throw new HgRemoteConnectionException("Bad URL", ex).setRemoteCommand("pushkey").setServerInfo(getServerLocation());
tikhomirov@687: 		} catch (IOException ex) {
tikhomirov@687: 			throw new HgRemoteConnectionException("Communication failure", ex).setRemoteCommand("pushkey").setServerInfo(getServerLocation());
tikhomirov@687: 		}
tikhomirov@687: 	}
tikhomirov@687: 
tikhomirov@687: 	public InputStream listkeys(String namespace, String actionName) throws HgRemoteConnectionException, HgRuntimeException {
tikhomirov@687: 		try {
tikhomirov@687: 			URL u = new URL(url, url.getPath() + "?cmd=listkeys&namespace=" + namespace);
tikhomirov@687: 			conn = setupConnection(u.openConnection());
tikhomirov@687: 			conn.connect();
tikhomirov@687: 			if (debug) {
tikhomirov@687: 				dumpResponseHeader(u);
tikhomirov@687: 			}
tikhomirov@687: 			checkResponseOk(actionName, "listkeys");
tikhomirov@687: 			return conn.getInputStream();
tikhomirov@687: 		} catch (MalformedURLException ex) {
tikhomirov@687: 			throw new HgRemoteConnectionException("Bad URL", ex).setRemoteCommand(CMD_LISTKEYS).setServerInfo(getServerLocation());
tikhomirov@687: 		} catch (IOException ex) {
tikhomirov@687: 			throw new HgRemoteConnectionException("Communication failure", ex).setRemoteCommand(CMD_LISTKEYS).setServerInfo(getServerLocation());
tikhomirov@687: 		}
tikhomirov@687: 	}
tikhomirov@687: 	
tikhomirov@687: 	private void checkResponseOk(String opName, String remoteCmd) throws HgRemoteConnectionException, IOException {
tikhomirov@687: 		if (conn.getResponseCode() != 200) {
tikhomirov@687: 			String m = conn.getResponseMessage() == null ? "unknown reason" : conn.getResponseMessage();
tikhomirov@687: 			String em = String.format("%s failed: %s (HTTP error:%d)", opName, m, conn.getResponseCode());
tikhomirov@687: 			throw new HgRemoteConnectionException(em).setRemoteCommand(remoteCmd).setServerInfo(getServerLocation());
tikhomirov@687: 		}
tikhomirov@687: 	}
tikhomirov@687: 
tikhomirov@687: 	private HttpURLConnection setupConnection(URLConnection urlConnection) {
tikhomirov@687: 		urlConnection.setRequestProperty("User-Agent", "hg4j/1.0.0");
tikhomirov@687: 		urlConnection.addRequestProperty("Accept", "application/mercurial-0.1");
tikhomirov@687: 		if (authInfo != null) {
tikhomirov@687: 			urlConnection.addRequestProperty("Authorization", "Basic " + authInfo);
tikhomirov@687: 		}
tikhomirov@687: 		if (sslContext != null) {
tikhomirov@687: 			((HttpsURLConnection) urlConnection).setSSLSocketFactory(sslContext.getSocketFactory());
tikhomirov@687: 		}
tikhomirov@687: 		return (HttpURLConnection) urlConnection;
tikhomirov@687: 	}
tikhomirov@687: 	
tikhomirov@687: 	private StringBuilder appendNodeidListArgument(String key, List<Nodeid> values, StringBuilder sb) {
tikhomirov@687: 		if (sb == null) {
tikhomirov@687: 			sb = new StringBuilder(20 + values.size() * 41);
tikhomirov@687: 		}
tikhomirov@687: 		sb.append(key);
tikhomirov@687: 		sb.append('=');
tikhomirov@687: 		for (Nodeid n : values) {
tikhomirov@687: 			sb.append(n.toString());
tikhomirov@687: 			sb.append('+');
tikhomirov@687: 		}
tikhomirov@687: 		if (sb.charAt(sb.length() - 1) == '+') {
tikhomirov@687: 			// strip last space 
tikhomirov@687: 			sb.setLength(sb.length() - 1);
tikhomirov@687: 		}
tikhomirov@687: 		return sb;
tikhomirov@687: 	}
tikhomirov@687: 
tikhomirov@687: 	private void dumpResponseHeader(URL u) {
tikhomirov@687: 		System.out.printf("Query (%d bytes):%s\n", u.getQuery().length(), u.getQuery());
tikhomirov@687: 		System.out.println("Response headers:");
tikhomirov@687: 		final Map<String, List<String>> headerFields = conn.getHeaderFields();
tikhomirov@687: 		for (String s : headerFields.keySet()) {
tikhomirov@687: 			System.out.printf("%s: %s\n", s, conn.getHeaderField(s));
tikhomirov@687: 		}
tikhomirov@687: 	}
tikhomirov@687: 	
tikhomirov@687: 	private void dumpResponse() throws IOException {
tikhomirov@687: 		if (conn.getContentLength() > 0) {
tikhomirov@687: 			final Object content = conn.getContent();
tikhomirov@687: 			System.out.println(content);
tikhomirov@687: 		}
tikhomirov@687: 	}
tikhomirov@687: }