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* to you under the Apache License, Version 2.0 (the
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* KIND, either express or implied. See the License for the
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*
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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.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.params.SyncBasicHttpParams;
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 {
/**
* Main entry point to this example.
*
* @param args ignored
*/
public final static void main(String[] args) throws Exception {
HttpHost target = new HttpHost("www.apache.org", 80, "http");
// Register the "http" protocol scheme, it is required
// by the default operator to look up socket factories.
SchemeRegistry supportedSchemes = new SchemeRegistry();
SocketFactory sf = PlainSocketFactory.getSocketFactory();
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 SyncBasicHttpParams();
HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
HttpProtocolParams.setUseExpectContinue(params, false);
ClientConnectionManager clcm = new ThreadSafeClientConnManager(supportedSchemes);
HttpRequest req = new BasicHttpRequest("OPTIONS", "*", HttpVersion.HTTP_1_1);
req.addHeader("Host", target.getHostName());
HttpContext ctx = new BasicHttpContext();
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, params);
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();
} catch (Exception ex) {
System.out.println("problem during shutdown");
ex.printStackTrace();
}
}
System.out.println("releasing connection");
clcm.releaseConnection(conn, -1, null);
}
}
}