HTTPClient help

I am trying to redirect to a URL from a servlet using POST. I get no
error messages but my page doesn't go anywhere. My print statement at the
end prints "ResponseBody = null". What am I doing wrong? This is my code
that I have (note I have removed actual URL for security reasons)....

//Create an instance of HttpClient.
HttpClient client = new HttpClient();

// Create a method instance.
PostMethod post = new PostMethod("https://URL";);
NameValuePair[] data = {
new NameValuePair("agent_id", username),
new NameValuePair("password", pwd),
new NameValuePair("poltyp", type),
new NameValuePair("polno", policy)
};
post.setRequestBody(data);

try {
client.executeMethod(post);
post.releaseConnection();

String in =
post.getResponseBodyAsString();
System.out.println("ResponseBody = " +
in);

}
catch(HttpException e) {
e.printStackTrace();
}
catch(IOException e) {
e.printStackTrace();
}

Thank you for your help!
Kara


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