httpcomponents-client/RELEASE_NOTES.txt

Changes since 4.0 Alpha 4
-------------------

* Fixed request re-generation logic when retrying a failed request.
  Auto-generated headers will no accumulate.
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-424] Preemptive authentication no longer limited to BASIC
  scheme only. HttpClient can be customized to authenticate preemptively
  with DIGEST scheme.
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-670] Pluggable hostname resolver.
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-719] Clone support for HTTP request and cookie objects.
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-776] Fixed concurrency issues with AbstractPoolEntry.
  Contributed by Sam Berlin <sberlin at gmail.com>

* Resolved a long standing problem with HttpClient not taking into account
  the user context when pooling / re-using connections. HttpClient now
  correctly handles stateful / user specific connections such as persistent 
  NTLM connections and SSL connections with client side authentication. 
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-773] Improved handling of the 'expires' attribute by the
  'Best Match' cookie spec.
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* Partial NTLM support (requires an external NTLM engine). For details see
  NTLM_SUPPORT.txt
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* Redesigned local execution context management.
  Contributed by Oleg Kalnichevski <olegk at apache.org>

--------------------------------------

Release 4.0 Alpha 4
-------------------

ALPHA4 marks the completion of the overhaul of the connection management 
code in HttpClient. All known shortcomings of the old HttpClient 3.x 
connection management API have been addressed.

NTLM authentication remains the only missing major feature in the new 
codeline that prevents us from moving awards the API freeze.

There has been a number of important bug fixes since ALPHA3. All upstream 
projects are encouraged to upgrade to the latest release.

-------------------

HttpClient 3.x features that have NOT yet been ported:
-------------------

* NTLM authentication scheme

-------------------

Changelog:
-------------------

* [HTTPCLIENT-765] String.toLowerCase() / toUpperCase() should specify 
  Locale.ENGLISH
  Contributed by Sebastian Bazley <sebb at apache.org>

* [HTTPCLIENT-769] Do not pool connection marked non-reusable.
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-763] Fixed problem with AbstractClientConnAdapter#abortConnection() 
  not releasing the connection if called from the main execution thread while 
  there is no blocking I/O operation.
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-652] Added optional state attribute to managed client connections. 
  This enables connection managers to correctly handle stateful connections.
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-673] Revised max connections per route configuration
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-753] Class Scheme and related classes moved to a separate package
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-757] Improved request wrapping in the DefaultClientRequestDirector. 
  This also fixed the problem with the default proxy set at the client level 
  having no effect. 
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-734] Request abort will unblock the thread waiting for a connection
  Contributed by Sam Berlin <sberlin at gmail.com>

* [HTTPCLIENT-759] Ensure release of connections back to the connection manager 
  on exceptions.
  Contributed by Sam Berlin <sberlin at gmail.com>

* [HTTPCLIENT-758] Fixed the use of generics in AbstractHttpClient
  #removeRequestInterceptorByClass and #removeResponseInterceptorByClass
  Contributed by Johannes Koch <johannes.koch at fit.fraunhofer.de>

* [HTTPCLIENT-749] HttpParams beans
  Contributed by Stojce Dimski <sdmiski at yahoo.it>

* [HTTPCLIENT-755] Workaround for known bugs in java.net.URI.resolve()
  Bug ID: 4708535
  Contributed by Johannes Koch <johannes.koch at fit.fraunhofer.de>

HttpClient API changes (generated by JarDiff 0.2)
--------------------------------------
Class removed: 
  public org.apache.http.client.methods.UrlEncodedFormEntity extends org.apache.http.entity.AbstractHttpEntity
Class removed: 
  public org.apache.http.client.utils.URLUtils extends java.lang.Object
Class removed: 
  public abstract org.apache.http.conn.LayeredSocketFactory extends java.lang.Object implements org.apache.http.conn.SocketFactory
Class removed: 
  public final org.apache.http.conn.PlainSocketFactory extends java.lang.Object implements org.apache.http.conn.SocketFactory
Class removed: 
  public final org.apache.http.conn.Scheme extends java.lang.Object
Class removed: 
  public final org.apache.http.conn.SchemeRegistry extends java.lang.Object
Class removed: 
  public abstract org.apache.http.conn.SocketFactory extends java.lang.Object
Class removed: 
  public org.apache.http.conn.util.SocketUtils extends java.lang.Object
Class removed: 
  public org.apache.http.impl.client.RoutedRequest.Impl extends java.lang.Object implements org.apache.http.impl.client.RoutedRequest
Class added: 
  public org.apache.http.auth.params.AuthParamBean extends org.apache.http.params.HttpAbstractParamBean
Class added: 
  public org.apache.http.client.entity.UrlEncodedFormEntity extends org.apache.http.entity.StringEntity
Class added: 
  public org.apache.http.client.params.ClientParamBean extends org.apache.http.params.HttpAbstractParamBean
Class added: 
  public org.apache.http.client.protocol.ClientContextConfigurer extends java.lang.Object
Class added: 
  public org.apache.http.client.utils.URIUtils extends java.lang.Object
Class added: 
  public org.apache.http.client.utils.URLEncodedUtils extends java.lang.Object
Class added: 
  public abstract org.apache.http.conn.ClientConnectionRequest extends java.lang.Object
Class added: 
  public final org.apache.http.conn.MultihomePlainSocketFactory extends java.lang.Object implements org.apache.http.conn.scheme.SocketFactory
Class added: 
  public org.apache.http.conn.params.ConnConnectionParamBean extends org.apache.http.params.HttpAbstractParamBean
Class added: 
  public org.apache.http.conn.params.ConnManagerParamBean extends org.apache.http.params.HttpAbstractParamBean
Class added: 
  public abstract org.apache.http.conn.params.ConnPerRoute extends java.lang.Object
Class added: 
  public final org.apache.http.conn.params.ConnPerRouteBean extends java.lang.Object implements org.apache.http.conn.params.ConnPerRoute
Class added: 
  public org.apache.http.conn.params.ConnRouteParamBean extends org.apache.http.params.HttpAbstractParamBean
Class added: 
  public abstract org.apache.http.conn.scheme.LayeredSocketFactory extends java.lang.Object implements org.apache.http.conn.scheme.SocketFactory
Class added: 
  public final org.apache.http.conn.scheme.PlainSocketFactory extends java.lang.Object implements org.apache.http.conn.scheme.SocketFactory
Class added: 
  public final org.apache.http.conn.scheme.Scheme extends java.lang.Object
Class added: 
  public final org.apache.http.conn.scheme.SchemeRegistry extends java.lang.Object
Class added: 
  public abstract org.apache.http.conn.scheme.SocketFactory extends java.lang.Object
Class added: 
  public org.apache.http.cookie.params.CookieSpecParamBean extends org.apache.http.params.HttpAbstractParamBean
Class added: 
  public org.apache.http.impl.conn.tsccm.Aborter extends java.lang.Object
Class added: 
  public abstract org.apache.http.impl.conn.tsccm.PoolEntryRequest extends java.lang.Object
Class added: 
  public org.apache.http.impl.conn.tsccm.WaitingThreadAborter extends java.lang.Object
Class changed: org.apache.http.auth.AuthSchemeRegistry
  Methods added:
    public synchronized void setItems(java.util.Map);

Class changed: org.apache.http.client.ClientRequestDirector
  Methods removed:
    public abstract org.apache.http.conn.ManagedClientConnection getConnection();

  Method changed:
  old:
    public abstract org.apache.http.HttpResponse execute(org.apache.http.HttpHost, org.apache.http.HttpRequest, org.apache.http.protocol.HttpContext) throws org.apache.http.HttpException, java.io.IOException, java.lang.InterruptedException;

  new:
    public abstract org.apache.http.HttpResponse execute(org.apache.http.HttpHost, org.apache.http.HttpRequest, org.apache.http.protocol.HttpContext) throws org.apache.http.HttpException, java.io.IOException;

Class changed: org.apache.http.client.HttpClient
  Method changed:
  old:
    public abstract org.apache.http.HttpResponse execute(org.apache.http.HttpHost, org.apache.http.HttpRequest) throws org.apache.http.HttpException, java.io.IOException, java.lang.InterruptedException;

  new:
    public abstract org.apache.http.HttpResponse execute(org.apache.http.HttpHost, org.apache.http.HttpRequest) throws org.apache.http.HttpException, java.io.IOException;

  Method changed:
  old:
    public abstract org.apache.http.HttpResponse execute(org.apache.http.HttpHost, org.apache.http.HttpRequest, org.apache.http.protocol.HttpContext) throws org.apache.http.HttpException, java.io.IOException, java.lang.InterruptedException;

  new:
    public abstract org.apache.http.HttpResponse execute(org.apache.http.HttpHost, org.apache.http.HttpRequest, org.apache.http.protocol.HttpContext) throws org.apache.http.HttpException, java.io.IOException;

  Method changed:
  old:
    public abstract org.apache.http.HttpResponse execute(org.apache.http.client.methods.HttpUriRequest) throws org.apache.http.HttpException, java.io.IOException, java.lang.InterruptedException;

  new:
    public abstract org.apache.http.HttpResponse execute(org.apache.http.client.methods.HttpUriRequest) throws org.apache.http.HttpException, java.io.IOException;

  Method changed:
  old:
    public abstract org.apache.http.HttpResponse execute(org.apache.http.client.methods.HttpUriRequest, org.apache.http.protocol.HttpContext) throws org.apache.http.HttpException, java.io.IOException, java.lang.InterruptedException;

  new:
    public abstract org.apache.http.HttpResponse execute(org.apache.http.client.methods.HttpUriRequest, org.apache.http.protocol.HttpContext) throws org.apache.http.HttpException, java.io.IOException;

Class changed: org.apache.http.client.methods.AbortableHttpRequest
  Methods added:
    public abstract void setConnectionRequest(org.apache.http.conn.ClientConnectionRequest) throws java.io.IOException;

  Method changed:
  old:
    public abstract void setReleaseTrigger(org.apache.http.conn.ConnectionReleaseTrigger);

  new:
    public abstract void setReleaseTrigger(org.apache.http.conn.ConnectionReleaseTrigger) throws java.io.IOException;

Class changed: org.apache.http.conn.ClientConnectionManager
  Methods removed:
    public abstract org.apache.http.conn.ManagedClientConnection getConnection(org.apache.http.conn.routing.HttpRoute) throws java.lang.InterruptedException;
    public abstract org.apache.http.conn.ManagedClientConnection getConnection(org.apache.http.conn.routing.HttpRoute, long, java.util.concurrent.TimeUnit) throws org.apache.http.conn.ConnectionPoolTimeoutException, java.lang.InterruptedException;
    public abstract org.apache.http.params.HttpParams getParams();
    public abstract org.apache.http.conn.SchemeRegistry getSchemeRegistry();

  Methods added:
    public abstract org.apache.http.conn.scheme.SchemeRegistry getSchemeRegistry();
    public abstract org.apache.http.conn.ClientConnectionRequest requestConnection(org.apache.http.conn.routing.HttpRoute, java.lang.Object);

Class changed: org.apache.http.conn.ClientConnectionManagerFactory
  Methods removed:
    public abstract org.apache.http.conn.ClientConnectionManager newInstance(org.apache.http.params.HttpParams, org.apache.http.conn.SchemeRegistry);

  Methods added:
    public abstract org.apache.http.conn.ClientConnectionManager newInstance(org.apache.http.params.HttpParams, org.apache.http.conn.scheme.SchemeRegistry);

Class changed: org.apache.http.conn.ManagedClientConnection
  Methods added:
    public abstract java.lang.Object getState();
    public abstract void setState(java.lang.Object);

Class changed: org.apache.http.conn.OperatedClientConnection
  Methods removed:
    public abstract void announce(java.net.Socket);
    public abstract void open(java.net.Socket, org.apache.http.HttpHost, boolean, org.apache.http.params.HttpParams) throws java.io.IOException;

  Methods added:
    public abstract void openCompleted(boolean, org.apache.http.params.HttpParams) throws java.io.IOException;
    public abstract void opening(java.net.Socket, org.apache.http.HttpHost) throws java.io.IOException;

Class changed: org.apache.http.conn.params.ConnManagerPNames
  Fields removed:
    public final static java.lang.String MAX_HOST_CONNECTIONS = http.connection-manager.max-per-host;

  Fields added:
    public final static java.lang.String MAX_CONNECTIONS_PER_ROUTE = http.conn-manager.max-per-route;

  Field changed:
  old:
    public final static java.lang.String MAX_TOTAL_CONNECTIONS = http.connection-manager.max-total;

  new:
    public final static java.lang.String MAX_TOTAL_CONNECTIONS = http.conn-manager.max-total;

Class changed: org.apache.http.conn.params.HttpConnectionManagerParams
  Methods removed:
    public static int getDefaultMaxConnectionsPerHost(org.apache.http.params.HttpParams);
    public static int getMaxConnectionsPerHost(org.apache.http.params.HttpParams, org.apache.http.conn.routing.HttpRoute);
    public static void setDefaultMaxConnectionsPerHost(org.apache.http.params.HttpParams, int);
    public static void setMaxConnectionsPerHost(org.apache.http.params.HttpParams, org.apache.http.conn.routing.HttpRoute, int);

  Methods added:
    public static org.apache.http.conn.params.ConnPerRoute getMaxConnectionsPerRoute(org.apache.http.params.HttpParams);
    public static void setMaxConnectionsPerRoute(org.apache.http.params.HttpParams, org.apache.http.conn.params.ConnPerRoute);

  Fields removed:
    public final static int DEFAULT_MAX_HOST_CONNECTIONS = 2;

  Class descriptor changed:
  old:
    public final org.apache.http.conn.params.HttpConnectionManagerParams extends java.lang.Object
  new:
    public final org.apache.http.conn.params.HttpConnectionManagerParams extends java.lang.Object implements org.apache.http.conn.params.ConnManagerPNames
Class changed: org.apache.http.conn.ssl.SSLSocketFactory
  Class descriptor changed:
  old:
    public org.apache.http.conn.ssl.SSLSocketFactory extends java.lang.Object implements org.apache.http.conn.LayeredSocketFactory
  new:
    public org.apache.http.conn.ssl.SSLSocketFactory extends java.lang.Object implements org.apache.http.conn.scheme.LayeredSocketFactory
Class changed: org.apache.http.conn.util.InetAddressUtils
  Methods removed:
    public InetAddressUtils();

Class changed: org.apache.http.cookie.CookieSpecRegistry
  Methods added:
    public synchronized void setItems(java.util.Map);

Class changed: org.apache.http.impl.client.AbstractHttpClient
  Methods added:
    protected org.apache.http.client.ClientRequestDirector createClientRequestDirector(org.apache.http.conn.ClientConnectionManager, org.apache.http.ConnectionReuseStrategy, org.apache.http.conn.routing.HttpRoutePlanner, org.apache.http.protocol.HttpProcessor, org.apache.http.client.HttpRequestRetryHandler, org.apache.http.client.RedirectHandler, org.apache.http.client.AuthenticationHandler, org.apache.http.client.AuthenticationHandler, org.apache.http.params.HttpParams);

  Method changed:
  old:
    public final org.apache.http.HttpResponse execute(org.apache.http.HttpHost, org.apache.http.HttpRequest) throws org.apache.http.HttpException, java.io.IOException, java.lang.InterruptedException;

  new:
    public final org.apache.http.HttpResponse execute(org.apache.http.HttpHost, org.apache.http.HttpRequest) throws org.apache.http.HttpException, java.io.IOException;

  Method changed:
  old:
    public final org.apache.http.HttpResponse execute(org.apache.http.HttpHost, org.apache.http.HttpRequest, org.apache.http.protocol.HttpContext) throws org.apache.http.HttpException, java.io.IOException, java.lang.InterruptedException;

  new:
    public final org.apache.http.HttpResponse execute(org.apache.http.HttpHost, org.apache.http.HttpRequest, org.apache.http.protocol.HttpContext) throws org.apache.http.HttpException, java.io.IOException;

  Method changed:
  old:
    public final org.apache.http.HttpResponse execute(org.apache.http.client.methods.HttpUriRequest) throws org.apache.http.HttpException, java.io.IOException, java.lang.InterruptedException;

  new:
    public final org.apache.http.HttpResponse execute(org.apache.http.client.methods.HttpUriRequest) throws org.apache.http.HttpException, java.io.IOException;

  Method changed:
  old:
    public final org.apache.http.HttpResponse execute(org.apache.http.client.methods.HttpUriRequest, org.apache.http.protocol.HttpContext) throws org.apache.http.HttpException, java.io.IOException, java.lang.InterruptedException;

  new:
    public final org.apache.http.HttpResponse execute(org.apache.http.client.methods.HttpUriRequest, org.apache.http.protocol.HttpContext) throws org.apache.http.HttpException, java.io.IOException;

Class changed: org.apache.http.impl.client.DefaultClientRequestDirector
  Methods removed:
    protected org.apache.http.conn.ManagedClientConnection allocateConnection(org.apache.http.conn.routing.HttpRoute, long) throws org.apache.http.HttpException, org.apache.http.conn.ConnectionPoolTimeoutException, java.lang.InterruptedException;
    protected org.apache.http.impl.client.RoutedRequest determineRoute(org.apache.http.HttpHost, org.apache.http.HttpRequest, org.apache.http.protocol.HttpContext) throws org.apache.http.HttpException;
    public org.apache.http.conn.ManagedClientConnection getConnection();
    protected org.apache.http.impl.client.RoutedRequest handleResponse(org.apache.http.impl.client.RoutedRequest, org.apache.http.HttpRequest, org.apache.http.HttpResponse, org.apache.http.protocol.HttpContext) throws org.apache.http.HttpException, java.io.IOException;

  Methods added:
    protected org.apache.http.conn.routing.HttpRoute determineRoute(org.apache.http.HttpHost, org.apache.http.HttpRequest, org.apache.http.protocol.HttpContext) throws org.apache.http.HttpException;
    protected org.apache.http.impl.client.RoutedRequest handleResponse(org.apache.http.impl.client.RoutedRequest, org.apache.http.HttpResponse, org.apache.http.protocol.HttpContext) throws org.apache.http.HttpException, java.io.IOException;

  Method changed:
  old:
    public org.apache.http.HttpResponse execute(org.apache.http.HttpHost, org.apache.http.HttpRequest, org.apache.http.protocol.HttpContext) throws org.apache.http.HttpException, java.io.IOException, java.lang.InterruptedException;

  new:
    public org.apache.http.HttpResponse execute(org.apache.http.HttpHost, org.apache.http.HttpRequest, org.apache.http.protocol.HttpContext) throws org.apache.http.HttpException, java.io.IOException;

Class changed: org.apache.http.impl.client.RoutedRequest
  Methods removed:
    public abstract org.apache.http.HttpRequest getRequest();

  Methods added:
    public RoutedRequest(org.apache.http.impl.client.RequestWrapper, org.apache.http.conn.routing.HttpRoute);
    public final org.apache.http.impl.client.RequestWrapper getRequest();

  Fields added:
    protected final org.apache.http.impl.client.RequestWrapper request;
    protected final org.apache.http.conn.routing.HttpRoute route;

  Class descriptor changed:
  old:
    public abstract org.apache.http.impl.client.RoutedRequest extends java.lang.Object
  new:
    public org.apache.http.impl.client.RoutedRequest extends java.lang.Object
  Method changed:
  old:
    public abstract org.apache.http.conn.routing.HttpRoute getRoute();

  new:
    public final org.apache.http.conn.routing.HttpRoute getRoute();

Class changed: org.apache.http.impl.conn.AbstractPoolEntry
  Methods removed:
    protected AbstractPoolEntry(org.apache.http.conn.OperatedClientConnection, org.apache.http.conn.routing.HttpRoute);
    protected abstract org.apache.http.conn.ClientConnectionOperator getOperator();

  Methods added:
    protected AbstractPoolEntry(org.apache.http.conn.ClientConnectionOperator, org.apache.http.conn.routing.HttpRoute);
    public java.lang.Object getState();
    public void setState(java.lang.Object);

  Fields removed:
    protected org.apache.http.conn.routing.HttpRoute plannedRoute;

  Fields added:
    protected final org.apache.http.conn.ClientConnectionOperator connOperator;
    protected volatile org.apache.http.conn.routing.HttpRoute route;
    protected volatile java.lang.Object state;

  Field changed:
  old:
    protected org.apache.http.conn.OperatedClientConnection connection;

  new:
    protected volatile org.apache.http.conn.OperatedClientConnection connection;

  Field changed:
  old:
    protected org.apache.http.conn.routing.RouteTracker tracker;

  new:
    protected volatile org.apache.http.conn.routing.RouteTracker tracker;

Class changed: org.apache.http.impl.conn.AbstractPooledConnAdapter
  Methods added:
    public java.lang.Object getState();
    public void setState(java.lang.Object);

  Field changed:
  old:
    protected org.apache.http.impl.conn.AbstractPoolEntry poolEntry;

  new:
    protected volatile org.apache.http.impl.conn.AbstractPoolEntry poolEntry;

Class changed: org.apache.http.impl.conn.DefaultClientConnection
  Methods removed:
    public void announce(java.net.Socket);
    public void open(java.net.Socket, org.apache.http.HttpHost, boolean, org.apache.http.params.HttpParams) throws java.io.IOException;

  Methods added:
    public void openCompleted(boolean, org.apache.http.params.HttpParams) throws java.io.IOException;
    public void opening(java.net.Socket, org.apache.http.HttpHost);

Class changed: org.apache.http.impl.conn.DefaultClientConnectionOperator
  Methods removed:
    public DefaultClientConnectionOperator(org.apache.http.conn.SchemeRegistry);

  Methods added:
    public DefaultClientConnectionOperator(org.apache.http.conn.scheme.SchemeRegistry);

Class changed: org.apache.http.impl.conn.DefaultHttpRoutePlanner
  Methods removed:
    public DefaultHttpRoutePlanner(org.apache.http.conn.SchemeRegistry);

  Methods added:
    public DefaultHttpRoutePlanner(org.apache.http.conn.scheme.SchemeRegistry);

Class changed: org.apache.http.impl.conn.ProxySelectorRoutePlanner
  Methods removed:
    public ProxySelectorRoutePlanner(org.apache.http.conn.SchemeRegistry, java.net.ProxySelector);

  Methods added:
    public ProxySelectorRoutePlanner(org.apache.http.conn.scheme.SchemeRegistry, java.net.ProxySelector);

Class changed: org.apache.http.impl.conn.SingleClientConnManager
  Methods removed:
    public SingleClientConnManager(org.apache.http.params.HttpParams, org.apache.http.conn.SchemeRegistry);
    protected org.apache.http.conn.ClientConnectionOperator createConnectionOperator(org.apache.http.conn.SchemeRegistry);
    public org.apache.http.conn.ManagedClientConnection getConnection(org.apache.http.conn.routing.HttpRoute);
    public final org.apache.http.conn.ManagedClientConnection getConnection(org.apache.http.conn.routing.HttpRoute, long, java.util.concurrent.TimeUnit);
    public org.apache.http.params.HttpParams getParams();
    public org.apache.http.conn.SchemeRegistry getSchemeRegistry();

  Methods added:
    public SingleClientConnManager(org.apache.http.params.HttpParams, org.apache.http.conn.scheme.SchemeRegistry);
    protected org.apache.http.conn.ClientConnectionOperator createConnectionOperator(org.apache.http.conn.scheme.SchemeRegistry);
    protected void finalize() throws java.lang.Throwable;
    public org.apache.http.conn.ManagedClientConnection getConnection(org.apache.http.conn.routing.HttpRoute, java.lang.Object);
    public org.apache.http.conn.scheme.SchemeRegistry getSchemeRegistry();
    public final org.apache.http.conn.ClientConnectionRequest requestConnection(org.apache.http.conn.routing.HttpRoute, java.lang.Object);

  Fields removed:
    protected org.apache.http.params.HttpParams params;

Class changed: org.apache.http.impl.conn.SingleClientConnManager.PoolEntry
  Methods removed:
    protected SingleClientConnManager.PoolEntry(org.apache.http.impl.conn.SingleClientConnManager, org.apache.http.conn.OperatedClientConnection);
    protected org.apache.http.conn.ClientConnectionOperator getOperator();

  Methods added:
    protected SingleClientConnManager.PoolEntry(org.apache.http.impl.conn.SingleClientConnManager);

Class changed: org.apache.http.impl.conn.tsccm.AbstractConnPool
  Methods removed:
    protected AbstractConnPool(org.apache.http.conn.ClientConnectionManager);
    public abstract org.apache.http.impl.conn.tsccm.BasicPoolEntry getEntry(org.apache.http.conn.routing.HttpRoute, long, java.util.concurrent.TimeUnit, org.apache.http.conn.ClientConnectionOperator) throws org.apache.http.conn.ConnectionPoolTimeoutException, java.lang.InterruptedException;

  Methods added:
    protected AbstractConnPool();
    public final org.apache.http.impl.conn.tsccm.BasicPoolEntry getEntry(org.apache.http.conn.routing.HttpRoute, java.lang.Object, long, java.util.concurrent.TimeUnit) throws org.apache.http.conn.ConnectionPoolTimeoutException, java.lang.InterruptedException;
    public abstract org.apache.http.impl.conn.tsccm.PoolEntryRequest requestPoolEntry(org.apache.http.conn.routing.HttpRoute, java.lang.Object);

  Fields removed:
    protected org.apache.http.impl.conn.tsccm.AbstractConnPool.ConnMgrRef connManager;
    protected org.apache.http.params.HttpParams params;

Class changed: org.apache.http.impl.conn.tsccm.BasicPoolEntry
  Methods removed:
    protected org.apache.http.conn.ClientConnectionOperator getOperator();

Class changed: org.apache.http.impl.conn.tsccm.ConnPoolByRoute
  Methods removed:
    public ConnPoolByRoute(org.apache.http.conn.ClientConnectionManager);
    public org.apache.http.impl.conn.tsccm.BasicPoolEntry getEntry(org.apache.http.conn.routing.HttpRoute, long, java.util.concurrent.TimeUnit, org.apache.http.conn.ClientConnectionOperator) throws org.apache.http.conn.ConnectionPoolTimeoutException, java.lang.InterruptedException;
    protected org.apache.http.impl.conn.tsccm.BasicPoolEntry getFreeEntry(org.apache.http.impl.conn.tsccm.RouteSpecificPool);

  Methods added:
    public ConnPoolByRoute(org.apache.http.conn.ClientConnectionOperator, org.apache.http.params.HttpParams);
    protected org.apache.http.impl.conn.tsccm.BasicPoolEntry getEntryBlocking(org.apache.http.conn.routing.HttpRoute, java.lang.Object, long, java.util.concurrent.TimeUnit, org.apache.http.impl.conn.tsccm.WaitingThreadAborter) throws org.apache.http.conn.ConnectionPoolTimeoutException, java.lang.InterruptedException;
    protected org.apache.http.impl.conn.tsccm.BasicPoolEntry getFreeEntry(org.apache.http.impl.conn.tsccm.RouteSpecificPool, java.lang.Object);
    public org.apache.http.impl.conn.tsccm.PoolEntryRequest requestPoolEntry(org.apache.http.conn.routing.HttpRoute, java.lang.Object);

  Fields added:
    protected final int maxTotalConnections;
    protected final org.apache.http.conn.ClientConnectionOperator operator;

Class changed: org.apache.http.impl.conn.tsccm.RouteSpecificPool
  Methods removed:
    public RouteSpecificPool(org.apache.http.conn.routing.HttpRoute);
    public org.apache.http.impl.conn.tsccm.BasicPoolEntry allocEntry();

  Methods added:
    public RouteSpecificPool(org.apache.http.conn.routing.HttpRoute, int);
    public org.apache.http.impl.conn.tsccm.BasicPoolEntry allocEntry(java.lang.Object);
    public int getCapacity();
    public final int getMaxEntries();

  Fields added:
    protected final int maxEntries;

Class changed: org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager
  Methods removed:
    public ThreadSafeClientConnManager(org.apache.http.params.HttpParams, org.apache.http.conn.SchemeRegistry);
    protected org.apache.http.conn.ClientConnectionOperator createConnectionOperator(org.apache.http.conn.SchemeRegistry);
    protected org.apache.http.impl.conn.tsccm.AbstractConnPool createConnectionPool();
    public org.apache.http.conn.ManagedClientConnection getConnection(org.apache.http.conn.routing.HttpRoute) throws java.lang.InterruptedException;
    public org.apache.http.conn.ManagedClientConnection getConnection(org.apache.http.conn.routing.HttpRoute, long, java.util.concurrent.TimeUnit) throws org.apache.http.conn.ConnectionPoolTimeoutException, java.lang.InterruptedException;
    public org.apache.http.params.HttpParams getParams();
    public org.apache.http.conn.SchemeRegistry getSchemeRegistry();

  Methods added:
    public ThreadSafeClientConnManager(org.apache.http.params.HttpParams, org.apache.http.conn.scheme.SchemeRegistry);
    protected org.apache.http.conn.ClientConnectionOperator createConnectionOperator(org.apache.http.conn.scheme.SchemeRegistry);
    protected org.apache.http.impl.conn.tsccm.AbstractConnPool createConnectionPool(org.apache.http.params.HttpParams);
    protected void finalize() throws java.lang.Throwable;
    public org.apache.http.conn.scheme.SchemeRegistry getSchemeRegistry();
    public org.apache.http.conn.ClientConnectionRequest requestConnection(org.apache.http.conn.routing.HttpRoute, java.lang.Object);

  Fields removed:
    protected org.apache.http.params.HttpParams params;

Class changed: org.apache.http.impl.conn.tsccm.WaitingThread
  Methods added:
    public void interrupt();

API diff generated by JarDiff http://www.osjava.org/jardiff/

--------------------------------------

Release 4.0 Alpha 3
-------------------

ALPHA3 release brings another round of API refinements and improvements in 
functionality. As of this release HttpClient requires Java 5 compatible 
runtime environment and takes full advantage of generics and new concurrency
primitives.     

This release also introduces new default cookie policy that selects a cookie 
specification depending on the format of cookies sent by the target host. 
It is no longer necessary to know beforehand what kind of HTTP cookie support 
the target host provides. HttpClient is now able to pick up either a lenient 
or a strict cookie policy depending on the compliance level of the target host.

Another notable improvement is a completely reworked support for multipart 
entities based on Apache mime4j library.

-------------------

HttpClient 3.x features that have NOT yet been ported:
-------------------

* NTLM authentication scheme

-------------------

Changelog:
-------------------

* [HTTPCLIENT-742] common interface for HttpRoute and RouteTracker
  Contributed by Roland Weber <rolandw at apache.org>

* [HTTPCLIENT-741] Fixed concurrency issues in AbstractClientConnAdapter.
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-726] testcase for spurious wakeups in ThreadSafeClientConnManager
  Contributed by Roland Weber <rolandw at apache.org>

* [HTTPCLIENT-643] Automatic connect fail-over for multi-home remote servers.
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-735] unsetting of DEFAULT_PROXY and FORCED_ROUTE in hierarchies
  Contributed by Roland Weber <rolandw at apache.org>

* [HTTPCLIENT-723] route planner based on java.net.ProxySelector
  Contributed by Roland Weber <rolandw at apache.org>

* [HTTPCLIENT-740] don't start connection GC thread in pool constructor
  Contributed by Roland Weber <rolandw at apache.org>

* [HTTPCLIENT-736] route planners use SchemeRegistry instead of ConnManager
  Contributed by Roland Weber <rolandw at apache.org>

* [HTTPCLIENT-730] Fixed rewriting of URIs containing escaped characters
  Contributed by Sam Berlin <sberlin at gmail.com> and 
  Oleg Kalnichevski <olegk at apache.org>
 
* [HTTPCLIENT-667] Added 'Meta' cookie policy that selects a cookie 
  specification depending on the format of the cookie(s).
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-729] Move HttpRoute and related classes to routing package.
  Contributed by Roland Weber <rolandw at apache.org>

* [HTTPCLIENT-725] Use TimeUnit arguments for timeouts in connection manager.
  Contributed by Roland Weber <rolandw at apache.org>

* [HTTPCLIENT-677] Connection manager no longer uses Thread.interrupt().
  Contributed by Roland Weber <rolandw at apache.org>

* [HTTPCLIENT-716] Allow application-defined routes.
  Contributed by Roland Weber <rolandw at apache.org>

* [HTTPCLIENT-712] Improve HttpRoute API
  Contributed by Roland Weber <rolandw at apache.org>

* [HTTPCLIENT-711] Bad route computed for redirected requests
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-715] Remove RoutedRequest from API
  Contributed by Roland Weber <rolandw at apache.org>

* [HTTPCLIENT-705] Fixed incorrect handling of URIs with null path component.
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-688] HttpOptions#getAllowedMethods can now handle multiple 
  Allow headers.
  Contributed by Andrea Selva <selva.andre at gmail.com>

--------------------------------------

Release 4.0 Alpha 2
-------------------

ALPHA2 release is another milestone in the redesign of HttpClient. It includes 
a number of improvements since ALPHA1, among which are improved connection 
pooling, support for proxy chains, redesigned HTTP state and authentication
credentials management API, improved RFC 2965 cookie specification.   

-------------------

HttpClient 3.x features that have NOT yet been ported
-------------------
* NTLM authentication scheme

* Support for multipart MIME coded entities  

-------------------

Changelog
-------------------

* [HTTPCLIENT-698] Resolve non-absolute redirect URIs relative to 
  the request URI
  Contributed by Johannes Koch <johannes.koch at fit.fraunhofer.de>

* [HTTPCLIENT-697] Throw a more intelligible exception when connection
  to a remote host cannot be established.
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-689] Caching of SimpleDateFormat in DateUtils
  Contributed by Daniel Müller <strider at digitalstrider.com>

* [HTTPCLIENT-689] stackable parameters in AbstractHttpClient
  Contributed by Roland Weber <rolandw at apache.org>

* [HTTPCLIENT-477] Use distinct instances of the authentication handler 
  interface for authentication with target and proxy hosts
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-690] ManagedClientConnection provides access to SSLSession
  Contributed by Roland Weber <rolandw at apache.org>

* [HTTPCLIENT-692] ClientConnectionManager throws InterruptedException
  Contributed by Roland Weber <rolandw at apache.org>

* [HTTPCORE-116] moved parameter names to interfaces
  Contributed by Roland Weber <rolandw at apache.org>

* [HTTPCLIENT-649] support for proxy chains in HttpConn
  Contributed by Roland Weber <rolandw at apache.org>

* [HTTPCLIENT-636] refactor ThreadSafeClientConnManager in separate package
  Contributed by Roland Weber <rolandw at apache.org>

* [HTTPCLIENT-669] new HttpRoutePlanner interface and implementation
  Contributed by Andrea Selva <selva.andre at gmail.com>

* [HTTPCLIENT-653] detached connection wrapper no longer prevents
  garbage collection of ThreadSafeClientConnManager
  Contributed by Roland Weber <rolandw at apache.org>

* [HTTPCLIENT-674] use org.apache.http.util.VersionInfo instead of a local one
  Contributed by Roland Weber <rolandw at apache.org>

* [HTTPCLIENT-666] Replaced HttpState with CredentialsProvier and CookieStore interfaces 
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCORE-100] revised HttpContext hierarchy
  Contributed by Roland Weber <rolandw at apache.org>

* [HTTPCLIENT-618] eliminate class HostConfiguration
  Contributed by Roland Weber <rolandw at apache.org>

* [HTTPCLIENT-672] re-sync with API changes in core alpha6-SNAPSHOT
  Contributed by Roland Weber <rolandw at apache.org>

--------------------------------------

Release 4.0 Alpha 1
-------------------

HttpClient 4.0 represents a complete, ground-up redesign and almost a complete
rewrite of the HttpClient 3.x codeline. This release finally addresses several
design flaws that existed since the 1.0 release and could not be fixed without
a major code overhaul and breaking API compatibility.

The HttpClient 4.0 API is still very experimental and is bound to change
during the course of the ALPHA development phase. Several important features
have not yet been ported to the new API.

Architectural changes
---------------------

* Redesign of the HttpClient internals addressing all known
  major architectural shortcomings of the 3.x codeline

* Cleaner, more flexible and expressive API   

* Better performance and smaller memory footprint due to a more 
  efficient HTTP transport based on HttpCore. HttpClient 4.0 is 
  expected to be 10% to 25% faster than HttpClient 3.x codeline

* More modular structure   

* Pluggable redirect and authentication handlers   

* Support for protocol incerceptors

* Improved connection management 

* Improved support for sending requests via a proxy or a chain of 
  proxies 

* Improved handling redirects of entity enclosing requests

* More flexible SSL context customization 

* Reduced intermediate garbage in the process of
  generating HTTP requests and parsing HTTP responses 

-------------------

HttpClient 3.x features that have NOT yet been ported
-------------------
* NTLM authentication scheme

* RFC2965 cookie policy (Cookie2)

* Support for multipart MIME coded entities  

-------------------

Changelog
-------------------

The following is a list of contributions tracked in JIRA.
Note that this is not a complete list of contributions or changes.
Since the API was redesigned completely, tracking everything outside
of the source code repository would have been too burdensome.

* [HTTPCLIENT-655] User-Agent string no longer violates RFC
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-541] Virtual host API redesign
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-614] Allow for different strategies when checking
  CN of x509 certificates
  Contributed by Julius Davies <juliusdavies at gmail.com>

* [HTTPCLIENT-136] Fixed inadequate proxy support
  Long standing architectural problem. Issue opened on 19/Dec/2002.
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-63] Support for pluggable redirect and authentication handlers
  Long standing architectural problem. Issue opened on 15/Jul/2002. 
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-245] Fixed redirect handling. HttpClient can now automatically
  handle redirects of entity enclosing requests. 
  Long standing architectural problem. Issue opened on 14/Jul/2003.
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-613] HTTPS connections now verify CN of x509 certificates
  Contributed by Julius Davies <juliusdavies at gmail.com>

* [HTTPCLIENT-497] Wire/header logger names consistent with class loggers
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-484] AuthSSLProtocolSocketFactory in the main distribution
  Contributed by Oleg Kalnichevski <olegk at apache.org>

* [HTTPCLIENT-589] Do not consume the remaining response content if
  the connection is to be closed
  Contributed by Roland Weber <rolandw at apache.org>

* [HTTPCLIENT-475] Support for unconnected sockets. HTTP requests can now be
  aborted while network socket is still being connected.
  Contributed by Roland Weber <rolandw at apache.org>