Repeated requests on same HttpURLConnection

Is it possible to use the same HttpURLConnection to send similar repeated requests (parameters differing slightly based on the result of the previous request)? I end up getting a java.net.ProtocolException, so it seems like it's not possible.
If not, I understand that HTTP is inherently one-for-one in terms of requests and responses, but I would think the same connection could still be used. Any explanations out there concerning this?
The code I have works when I reestablish the connection every time, but I'd obviously like to not have to do it that way.
Thanks,
Ken

The reason you can't do this is because TCP (the upper half of TCP/IP, HTTP's transport protocol) is by definition a stateless protocol and therefore prohibits it. "Stateless" means that the connection only lives as long as necessary to transmit the request, process it, and return the response. That's why cookies are necessary to maintain user sessions in web applications.
To understand why this is necessary for the health of the Internet, imagine if every request to a web server left the connection open - the web server would soon get completely bogged down by open connections and crash! There is no way to guarantee that every client is going to close the connection, so it is better to enforce it at the protocol level.

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Multiple HTTP requests through same connection

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i am new to atg.
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Delete overlapping requests of same DTP from cube

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i want to delete over lapping requests of same DTP in cube, but here while i am searching for the DTP in process variant, the system is not showing the DTP(it is active).
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Problem while sending/Receiving request using the HttpURLConnection obj

Hi,
We are facing the problem while passing the request in Weblogic.
Looks like there is some problem with Weblogic while sending/Receiving the request using the HttpURLConnection object.
Currently we are migrating 2 applications to WebLogic. Application1 to application2 request should pass.
Below is some example we tried:
"When we send a request to our code using the SSOAdaptor code (which handles the request/session in our application) which is on the SunOne server the request parameters are received by our code successfully. And also in Create User Functionality of application1 we are sending a request to webpass(which is on Sunone Server) using the HttpURLConnection object and the SOAP request is received successfully by the Webpass."
Looks like when we send request (using HttpURLConnection) from a server other than Weblogic to a servlet in a Weblogic the request parameters are received with out issues.
Where as when the request is sent from WebLogic to WebLogic the request parameters are missing some how.
Is there any issue in Weblogic? Please helpus on this.
Thanks,
Nagesh
Edited by: user9307541 on Mar 15, 2010 5:08 AM

Hi,
Please find below scenario for testing.
We have tested the SSOAdaptor code (it is the fucntion name which will send the data from source) locally by hittiing the WPS adaptor URL in a Java client program(TestRequest.java) and the request parameters were reaching the WPS Adapter successfully.
Then we have written two test servlets to test the communication between SSOAdaptor(TestServlet.java) and WPS adaptor(WPSServlet.java).
Functionality of TestSevlet: It is sending a request to WPSServelt similar to the way we are doing it in SSOAdaptor.
Functionality of WPSServlet: It will receive the request parameters and write the parameter Map to console.
We have deployed and these two servlets(in a single webapplication) on Tomcat server and the request parameters are reaching the WPSServlet successfully.
Output on Tomcat server:
before sending request
**********************Inside WPS Servlet -- the request Map is:{TypeAcc=[Ljava.lang.String;@14e3f41, ServiceName=[Ljava.lang.String;@1acd47, GMEPortalUserID=[Ljava.lang.String;@19b04e2, UserID=[Ljava.lang.String;@5dcec6, Country=[Ljava.lang.String;@b25b9d}
after sending request
After this we have deployed these two servlets (with in a single webapplication) on the Weblogic server in Dev machine(path: /apps/usmport/domains/usmport/servers/usmport_admin/upload/ssoAdaptor/WEB-INF/classes/com/gm/gmeportal/security/adaptor) and
now the request parameters are not reaching the WPSServlet.
Output on Weblogic Server:
before sending request
**********************Inside WPS Servlet -- the request Map is:{}
after sending request
Looks like there is some problem with Weblogic while sending/Receiving the request using the HttpURLConnection object.
When we send a request to WPSAdaptor using the Old SSOAdaptor code which is on the SunOne server the request parameters are received by WPS successfully. And also in Create User Functionality of Portal we are sending a request to webpass(which is on Sunone Server) using the HttpURLConnection object and the SOAP request is received successfully by the Webpass.
Looks like when we send request (using HttpURLConnection) from a server other than Weblogic to a servlet in a Weblogic the request parameters are received with out issues. Where as when the request is sent from weblogic to weblogic the request parameters are missing some how.
Please find below javs source code used to test this:
TestRequest.java
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
public class TestRequest {
     * @param args
     public static void main(String[] args) throws Exception{
          // TODO Auto-generated method stub
          excutePost("http://localhost:8080/Testing/TestServlet", "GMEPortalUserID=captest.wss@it0555&UserID=bl1133&Country=it&TypeAcc=256&ServiceName=Logon");
          //System.out.println("********** Now the request is from SSO *****************");
          //excuteGet("http://10.156.0.173:7013/channel21/wpsadapter", "GMEPortalUserID=captest.wss@it0554&UserID=bl1133&Country=it&TypeAcc=256&ServiceName=Logon");
     public static String excutePost(String targetURL, String urlParameters)
     URL url;
     HttpURLConnection connection = null;
     try {
     //Create connection
     url = new URL(targetURL);
     connection = (HttpURLConnection)url.openConnection();
     connection.setRequestMethod("POST");
     connection.setRequestProperty("Content-Type",
     "application/x-www-form-urlencoded");
     connection.setRequestProperty("Content-Length", "" +
     Integer.toString(urlParameters.getBytes().length));
     connection.setRequestProperty("Content-Language", "en-US");
     connection.setUseCaches (false);
     connection.setDoInput(true);
     connection.setDoOutput(true);
     //Send request
     DataOutputStream wr = new DataOutputStream (
     connection.getOutputStream ());
     wr.writeBytes (urlParameters);
     wr.flush ();
     wr.close ();
     //Get Response
     InputStream is = connection.getInputStream();
     BufferedReader rd = new BufferedReader(new InputStreamReader(is));
     String line;
     StringBuffer response = new StringBuffer();
     while((line = rd.readLine()) != null) {
     response.append(line);
     response.append('\r');
     rd.close();
     System.out.println("Response is:" + response);
     return response.toString();
     } catch (Exception e) {
     e.printStackTrace();
     return null;
     } finally {
     if(connection != null) {
     connection.disconnect();
     public static String excuteGet(String targetURL, String urlParameters) throws Exception
          URL url = new URL(targetURL);
          HttpURLConnection httpurlconnection =
               (HttpURLConnection) url.openConnection();
          /*httpurlconnection.setRequestProperty(
               "cookie",
               constructRequestParams(httpservletrequest.getCookies()));*/
          httpurlconnection.setDoOutput(true);
          httpurlconnection.setDoInput(true);
          httpurlconnection.setRequestProperty(
               "Content-length",
               String.valueOf(urlParameters.length()));
          OutputStream outputstream = httpurlconnection.getOutputStream();
          outputstream.write(urlParameters.getBytes());
          outputstream.flush();
          //Get Response
          try{
     InputStream is = httpurlconnection.getInputStream();
     BufferedReader rd = new BufferedReader(new InputStreamReader(is));
     String line;
     StringBuffer response = new StringBuffer();
     while((line = rd.readLine()) != null) {
     response.append(line);
     response.append('\r');
     rd.close();
     System.out.println("Response from SSO is:" + response);
     return response.toString();
     } catch (Exception e) {
     e.printStackTrace();
     return null;
     } finally {
     if(httpurlconnection != null) {
          httpurlconnection.disconnect();
TestServlet.java
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
* Servlet implementation class TestServlet
public class TestServlet extends HttpServlet {
     private static final long serialVersionUID = 1L;
* Default constructor.
public TestServlet() {
// TODO Auto-generated constructor stub
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
          // TODO Auto-generated method stub
          doPost(request,response);
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
          // TODO Auto-generated method stub
          //System.out.println("********************** the request Map is:" + request.getParameterMap());
          try {
               System.out.println("before sending request");
               excuteGet("http://localhost:7003/ssoAdaptor/WPSServlet", "GMEPortalUserID=captest.wss@it0554&UserID=bl1133&Country=it&TypeAcc=256&ServiceName=Logon");
               System.out.println("after sending request");
          } catch (Exception e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
     public String excuteGet(String targetURL, String urlParameters) throws Exception
          URL url = new URL(targetURL);
          HttpURLConnection httpurlconnection =
               (HttpURLConnection) url.openConnection();
          /*httpurlconnection.setRequestProperty(
               "cookie",
               constructRequestParams(httpservletrequest.getCookies()));*/
          httpurlconnection.setDoOutput(true);
          httpurlconnection.setDoInput(true);
          httpurlconnection.setRequestProperty(
               "Content-length",
               String.valueOf(urlParameters.length()));
          OutputStream outputstream = httpurlconnection.getOutputStream();
          outputstream.write(urlParameters.getBytes());
          outputstream.flush();
          //Get Response
          try{
     InputStream is = httpurlconnection.getInputStream();
     BufferedReader rd = new BufferedReader(new InputStreamReader(is));
     String line;
     StringBuffer response = new StringBuffer();
     while((line = rd.readLine()) != null) {
     response.append(line);
     response.append('\r');
     rd.close();
     //System.out.println("Response from SSO is:" + response);
     return response.toString();
     } catch (Exception e) {
     e.printStackTrace();
     return null;
     } finally {
     if(httpurlconnection != null) {
          httpurlconnection.disconnect();
WPSServlet.java
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
* Servlet implementation class WPSServlet
public class WPSServlet extends HttpServlet {
     private static final long serialVersionUID = 1L;
* @see HttpServlet#HttpServlet()
public WPSServlet() {
super();
// TODO Auto-generated constructor stub
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
          // TODO Auto-generated method stub
          System.out.println("**********************Inside WPS Servlet -- the request Map is:" + request.getParameterMap());
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
          // TODO Auto-generated method stub
          doGet(request,response);
Thanks,
Nagesh

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Repeated requests on same HttpURLConnection

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