Http URL.openConnection() - URLConnection, not HttpURLConnection

Is there any way of calling openConnection on an http URL object, and not getting a HttpURLConnection?
HttpURLConnection extends the URLConnection class in frequently-useful ways, for example by defaulting the Accept and Content-Type headers on requests (plus the frequently baffling getOutputStream/getErrorStream behaviour). However in some contexts, these extensions are profoundly unhelpful.
In particular, if I'm writing test code, I want to be able to make HTTP requests with missing Content-Type or Accept headers -- that is, without the default values which HttpURLConnection adds -- and there appears to be no way to do that, short of writing my own HTTP protocol handler.
Failing that, is there any way of deleting request headers from a HttpURLConnection? The obvious connect.setRequestProperty("header", null) doesn't do it (and isn't documented to).
Best wishes,
Norman

Thanks for that. The apache.commons.net classes look useful, but I think they end up being a little too low-level. The URLConnection class does usefully abstract the boring details of the HTTP transaction -- the only problem is that HttpURLConnection tries a little too hard.
I think my question really boils down to the following: is there a way of switching off the extra functionality/defaults in HttpURLConnection? (if so, it's insufficiently clearly documented).
I remember submitting an RFE to this effect a while ago, but can't find the entry in the bugs database (I apparently can't search for 'submitter').

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Regards,
Paul

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Message was edited by:
user571987

Question about (HttpURLConnection)url.openConnection();

Greetings Java Experts.
I have a question about the following code snippet.
As you can see below this snippet will establish a connection.
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connection = (HttpURLConnection)url.openConnection();
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stev

forever, unless you set SO_TIMEOUT

Error: HTTP method GET is not supported by this URL

Hey,
I am attempting to overload the doGet method with a Wrapper class I created for HttpServletReponse that extends it of course and I receive this error: "HTTP method GET is not supported by this URL". I figure you can't change the method as I have but I am curious if there is anyway I can go about to accomplish what I am trying to do. Basically I just need to extend the HttpServletResponse so that it contains a few more variables and such.
public class test extends HttpServlet {
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        out.println("<html>");
        out.println("<head>");
        out.println("</head>");
        out.println("<body>test</body>");
        out.println("</html>");


public void doGet(HttpServletRequest request, XmlServletResponseWrapper response)
is not the same method as
public void doGet(HttpServletRequest request, HttpServletResponse response)
The servlet container is going to call the later method and since you did not overwrite it to provide an implementation it sees the GET request as not being supported.
what you are looking to do is something like this:
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
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        out.println("<head>");
        out.println("</head>");
        out.println("<body>test</body>");
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Thanks in advance,
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Kindly check it. This is rtmp (FMS) connection or process download connection.
Script
Ex:
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dear all
can u solve my problem.am getting the *"HTTP Status 405 - HTTP method POST is not supported by this URL"* msg from the browser when i press the search button in my form.plz suggest me the solution for my fault.these are the following html,xml,class files:
search.html*
<html>
<head>
<title>Search Page</title>
</head>
<body>
<p align="center"><font size="6" color="#0000FF"><b>Search Module</b></font></p>
<p align="center"> </p>
<center>
<form method="POST" action="./emp">
<table border="1" width="43%">
<tr>
<td width="50%">
<p align="right">Employee Name</td>
<td width="50%"><input type="text" name="empname" size="36"></td>
</tr>
<tr>
<td width="100%" colspan="2">
<p align="center"><input type="submit" value="Search" name="B1"></td>
</tr>
</table>
</form>
</center>
</body>
</html>
web.xml*
<web-app>
<servlet>
<servlet-name>jdbc</servlet-name>
<servlet-class>searchModule</servlet-class>
<init-param>
<param-name>driver</param-name>
<param-value>sun.jdbc.odbc.JdbcOdbcDriver</param-value>
</init-param>
<init-param>
<param-name>url</param-name>
<param-value>jdbc:odbc:first</param-value>
</init-param>
<init-param>
<param-name>user</param-name>
<param-value>scott</param-value>
</init-param>
<init-param>
<param-name>pass</param-name>
<param-value>tiger</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>jdbc</servlet-name>
<url-pattern>/emp</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>search.html</welcome-file>
</welcome-file-list>
</web-app>
SearchModule.java*
import java.util.*;
import java.io.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class searchModule extends HttpServlet
Connection con;
public void init() throws ServletException
String d=getInitParameter("driver");
String u=getInitParameter("url");
String us=getInitParameter("user");
String pwd=getInitParameter("pass");
try
Class.forName(d);
con=DriverManager.getConnection(u,us,pwd);
catch(ClassNotFoundException e)
System.out.println(e);
catch(SQLException e)
System.out.println("Unable to establish the connection");
}//init
public void doGet(HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException
String empname=req.getParameter("empname");
res.setContentType("text/html");
PrintWriter pw=res.getWriter();
try
pw.println("<html><body><center>");
Statement st=con.createStatement();
String sql="select * from employee where empname="+empname;
ResultSet rs=st.executeQuery(sql);
if(rs.next())
pw.println("<h2>Employee Details</h2>");
pw.println("<table border=1>");
pw.println("<tr><th>Employee No.</th>");
pw.println("<th>Employee Name</th>");
pw.println("<th>Designation</th>");
pw.println("<th>Department</th>");
pw.println("<th>Salary</th>");
pw.println("</tr><tr>");
pw.println("<td>"+rs.getInt(1)+"</td>");
pw.println("<td>"+empname+"</td>");
pw.println("<td>"+rs.getString(3)+"</td>");
pw.println("<td>"+rs.getString(4)+"</td>");
pw.println("<td>"+rs.getInt(5)+"</td>");
pw.println("</tr></table>");
else
pw.println("<h2>Employee Record Not Found</h2>");
pw.println("</center></body></html>");
pw.close();
rs.close();
st.close();
catch(SQLException e)
System.out.println(e);
}//doPost
public void destroy()
if(con!=null)
try
con.close();
catch(Exception e)
System.out.println("Connection Closed");
}//destroy
}//searchModule
in control panel i selected System DNS and created the name as first and driver as Microsoft ODBC for Oracle
plz suggest me the solution where i committed mistake.

<form method="*POST*" action="./emp">
public void doGet (HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException
HTTP method POST is not supported by this URL

Weblogic does not call the ProxySelector class for http url

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Note: The code works fine if I execute it from tomcat.

Hi This is the method that I have for invoking webservices. It uses a Dispatch API. The myProxySelector is an instance of MyProxySelector which is already made defult in the appication startup.
This MyProxySelector has a threadlocal variable useProxy to indicate whether the proxy should be used or not. so I am setting the variable just before reply = dispatch.invoke(sm);
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public Object invoke() throws GLException {
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try {
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service.addPort(getOperation().getOperationName(), SOAPBinding.SOAP11HTTP_BINDING, call.getServiceEndpoint());
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initHandlers(dispatch);
Map<String, Object> ctx = dispatch.getRequestContext();
if (call.useWSS()) {
ctx.put(SOAPConstants.WSSE_SECURITY, new WSSHeader(getCredentials().getUsername(), getCredentials().getPassword(), call.sendEncryptedPassword()));
} else if (call.getCredentials() != null ) {
String user = getCredentials().getUsername();
if ( user != null ) {
ctx.put(Dispatch.USERNAME_PROPERTY, user);
if (getCredentials().getPassword() != null ) {
if (call.sendEncryptedPassword()) {
ctx.put(Dispatch.PASSWORD_PROPERTY, getCredentials().getPassword().getEncryption());
} else {
ctx.put(Dispatch.PASSWORD_PROPERTY, getCredentials().getPassword().getText());
MessageFactory mf = MessageFactory.newInstance();
SOAPMessage sm = mf.createMessage();
SOAPHeader sh = sm.getSOAPHeader();
SOAPBody sb = sm.getSOAPBody();
for ( Iterator<?> it = call.getOperation().getOrderedParameters().iterator(); it.hasNext(); ) {
WebServiceParameter parameter = (WebServiceParameter) it.next();
if (parameter.isBodyParam()) {
sb.addChildElement((SOAPElement)call.getParameterValue(parameter));
} else {
sh.addChildElement((SOAPElement)call.getParameterValue(parameter));
String endPoint = call.getServiceEndpoint();
myProxySelector.setUseProxy(useProxyServer);
if (getOperation().getReturn() != null) {
reply = dispatch.invoke(sm);
result = getReplyElement(reply);
call.setParameterValue(getOperation().getReturn(), result);
} else {
dispatch.invokeOneWay(sm);
} catch (Throwable t) {
throw GLException.factory(new CausedBy("Error Invoking Web Service Dispatch"),t);
return result;
.........// more code to get webservice details from db and load useProxyServer flag value
Here is the ProxySelector code
public class MyProxySelector extends ProxySelector {
protected ThreadLocal<Boolean> useProxy = new ThreadLocal<Boolean>();
     public ThreadLocal<Boolean> getUseProxy() {
          return useProxy;
     public void setUseProxy(boolean useProxy) {
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     public void setUseProxy(Boolean useProxy) {
          this.useProxy.set(useProxy);
     private ProxySelector jvmDefaultSelector = null;
     public ProxySelector getJVMDefaultSelector() {
          return jvmDefaultSelector;
     private static MyProxySelector myProxySelector = null;
     private MyProxySelector(ProxySelector jvmDefaultSelector) {
          this.jvmDefaultSelector = jvmDefaultSelector;
     public static MyProxySelector getInstance() {
          if(myProxySelector==null) {
               myProxySelector = new MyProxySelector(ProxySelector.getDefault());
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     @Override
     public List<Proxy> select(URI uri) {
          try {
               if (uri == null) {
                    throw new IllegalArgumentException("URI can't be null.");
               Boolean useProxyObject = useProxy.get();
               if(useProxyObject == null) {
                    String protocol = uri.getScheme();
                    if ("http".equalsIgnoreCase(protocol) || "https".equalsIgnoreCase(protocol)) {
                         return getProxyList();
                    } else if(jvmDefaultSelector != null) {
                         return jvmDefaultSelector.select(uri);;
               if(useProxyObject.booleanValue()) {
                    String protocol = uri.getScheme();
                    if ("http".equalsIgnoreCase(protocol) || "https".equalsIgnoreCase(protocol)) {
                         return getProxyList();
          } catch(Exception e) {
          } finally {
               if (useProxy != null) {
                    useProxy.remove();
          return getNoProxyList();
     @Override
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          if (uri == null || sa == null || ioe == null) {
               throw new IllegalArgumentException("Arguments can't be null.");
          if (jvmDefaultSelector != null) {
               jvmDefaultSelector.connectFailed(uri, sa, ioe);
private static final String PROXY_HOST = "glog.integration.http.proxyHost";
private static String httpProxyHost = GLProperties.get().getProperty(PROXY_HOST);
private static final String PROXY_PORT = "glog.integration.http.proxyPort";
private static String httpProxyPort = GLProperties.get().getProperty(PROXY_PORT);
private static ArrayList getNoProxyList() {
          ArrayList noProxyList = new ArrayList<Proxy>();
          noProxyList.add(Proxy.NO_PROXY);
          return noProxyList;
private static ArrayList getProxyList() {
     Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(httpProxyHost, Integer.parseInt(httpProxyPort)));
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          proxyList.add(proxy);
          return proxyList;
public static class Startup implements StartupShutdown {
public void load(T2SharedConnection conn) throws GLException {}
public void activate(T2SharedConnection conn) throws GLException {
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public void unload() throws GLException {}
Edited by: pshivrat on Sep 3, 2010 10:09 PM

Attaching a URL which does not start with HTTP / HTTPS in SAP TM

Dear Experts,
I am trying to insert a new URL to a Attachments table in FWO / FRB application.
My URL neither start with HTTP nor HTTPS (Ex: Z3://searchsmartstart...). while I am trying to insert such URL, I am getting an error message 'URL not valid.Check if the URL contains the protocol (HTTP/HTTPS). Message ID - /SCMTMS/UI_MESSAGES and message number 088.
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Thanks in advance for your reply.
Thanks,
Bharath.K

Hi Bharath,
Yes, you can achieve the same via URL redirection. Please follow the below steps.
1.Create a service in SICF e.g. sap/bc/redirect_z3 in your SAP TM system and follow following steps.
2. Create a class with interface IF_HTTP_EXTENSION e.g. ZCL_REDIRECT_URL
3. Maintain class created in step 2 into the Handler List of the service created in step 1.
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CALL METHOD server->request->get_form_data
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      name = 'PAR1'
    CHANGING
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6. Now attach the URL of your service created in step 1(Which will be http/https URL) to Attachments table in FWO / FRB application with parameter you want.
Now once you click this URL , Mehtod IF_HTTP_EXTENSION~HANDLE_REQUEST in Handler list class will execute here you can read the parameter as mentioned above and form a target URL and redirect to you intended target .
Thanks, Pravin

HTTP method GET is not supported by this URL

hi.. I am trying one Cookie example.. I m ready with the class file.. and I have deployed it in Tomcat.. but when I am trying to run this the error "HTTP method GET is not supported by this URL" is coming..
Pls give some clues so that I can run this....

Implement HttpServlet#doGet() in your servlet.

Http URL.openConnection() - URLConnection, not HttpURLConnection

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