/*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.http.examples.conn;
import org.apache.http.Header;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.HttpVersion;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.routing.HttpRoute;
import org.apache.http.conn.scheme.PlainSocketFactory;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.scheme.SocketFactory;
import org.apache.http.conn.ClientConnectionRequest;
import org.apache.http.conn.ManagedClientConnection;
import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;
import org.apache.http.message.BasicHttpRequest;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.protocol.HttpContext;
import org.apache.http.protocol.BasicHttpContext;
/**
* How to open a direct connection using
* {@link ClientConnectionManager ClientConnectionManager}.
* This exemplifies the <i>opening</i> of the connection only.
* The subsequent message exchange in this example should not
* be used as a template.
*
*
*
* @since 4.0
*/
public class ManagerConnectDirect {
/**
* The default parameters.
* Instantiated in {@link #setup setup}.
*/
private static HttpParams defaultParameters = null;
/**
* The scheme registry.
* Instantiated in {@link #setup setup}.
*/
private static SchemeRegistry supportedSchemes;
/**
* Main entry point to this example.
*
* @param args ignored
*/
public final static void main
(String[] args
)
final HttpHost target = new HttpHost("jakarta.apache.org", 80, "http");
setup(); // some general setup
ClientConnectionManager clcm = createManager();
HttpRequest req = createRequest(target);
HttpContext ctx = createContext();
System.
out.
println("preparing route to " + target
); HttpRoute route = new HttpRoute
(target, null, supportedSchemes.getScheme(target).isLayered());
System.
out.
println("requesting connection for " + route
); ClientConnectionRequest connRequest = clcm.requestConnection(route, null);
ManagedClientConnection conn = connRequest.getConnection(0, null);
try {
System.
out.
println("opening connection"); conn.open(route, ctx, getParams());
System.
out.
println("sending request"); conn.sendRequestHeader(req);
// there is no request entity
conn.flush();
System.
out.
println("receiving response header"); HttpResponse rsp = conn.receiveResponseHeader();
System.
out.
println("----------------------------------------"); System.
out.
println(rsp.
getStatusLine()); Header[] headers = rsp.getAllHeaders();
for (int i=0; i<headers.length; i++) {
System.
out.
println(headers
[i
]); }
System.
out.
println("----------------------------------------");
System.
out.
println("closing connection"); conn.close();
} finally {
if (conn.isOpen()) {
System.
out.
println("shutting down connection"); try {
conn.shutdown();
System.
out.
println("problem during shutdown"); x.
printStackTrace(System.
out); }
}
System.
out.
println("releasing connection"); clcm.releaseConnection(conn, -1, null);
}
} // main
private final static ClientConnectionManager createManager() {
return new ThreadSafeClientConnManager(getParams(), supportedSchemes);
}
/**
* Performs general setup.
* This should be called only once.
*/
private final static void setup() {
// Register the "http" protocol scheme, it is required
// by the default operator to look up socket factories.
supportedSchemes = new SchemeRegistry();
supportedSchemes.register(new Scheme("http", sf, 80));
// Prepare parameters.
// Since this example doesn't use the full core framework,
// only few parameters are actually required.
HttpParams params = new BasicHttpParams();
HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
HttpProtocolParams.setUseExpectContinue(params, false);
defaultParameters = params;
} // setup
private final static HttpParams getParams() {
return defaultParameters;
}
/**
* Creates a request to execute in this example.
* In a real application, request interceptors should be used
* to add the required headers.
*
* @param target the target server for the request
*
* @return a request without an entity
*/
private final static HttpRequest createRequest(HttpHost target) {
HttpRequest req = new BasicHttpRequest
("OPTIONS", "*", HttpVersion.HTTP_1_1);
req.addHeader("Host", target.getHostName());
return req;
}
/**
* Creates a context for executing a request.
* Since this example doesn't really use the execution framework,
* the context can be left empty.
*
* @return a new, empty context
*/
private final static HttpContext createContext() {
return new BasicHttpContext(null);
}
} // class ManagerConnectDirect