Couldn't get Form data to Servlet

Hi all, 

I have created registration form using Core form container. I need to save this data in a path based servlet. I have mentioned the servlet path but I'm getting only null values instead of the form fields.  I have mentioned the correct name field for getting the parameter. 

my servlet path: 

my servlet code is :

package com.adobe.aem.FormsDemo.core.servlets;
import javax.servlet.Servlet;
import javax.servlet.ServletException;

import org.apache.commons.httpclient.methods.multipart.MultipartRequestEntity;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.resource.ResourceResolverFactory;
import org.apache.sling.api.servlets.HttpConstants;
import org.apache.sling.api.servlets.SlingAllMethodsServlet;
import org.eclipse.jetty.http.MultiPartFormInputStream;
import org.eclipse.jetty.util.MultiPartWriter;
import org.jetbrains.annotations.NotNull;
import org.json.JSONException;
import org.json.JSONObject;
import org.osgi.framework.Constants;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;

@Component(service = Servlet.class, property = {
        Constants.SERVICE_DESCRIPTION + "=JSON path based servlet",
        "sling.servlet.methods=" + HttpConstants.METHOD_POST,
        "sling.servlet.methods=" + HttpConstants.METHOD_GET,
        "sling.servlet.paths=" + "/bin/form" })

public class CustomServlet extends SlingAllMethodsServlet {

    @Override
    protected void doGet(@NotNull SlingHttpServletRequest request, @NotNull SlingHttpServletResponse response) throws IOException {
        response.setContentType("text/html");
        response.setCharacterEncoding("utf-8");
        PrintWriter out = response.getWriter();
        out.print(request.getRequestURL());
        //out.print(request.getRequestParameter());
        //request.getParameterById();
        out.print("firstname is");
        out.print(request.getParameter("firstname"));
        out.print("lastname is");
        out.print(request.getParameter("lastname"));
        InputStream input = null;
        try {
            //String USER_AGENT = "Mozilla/5.0";

            out.println("HTTP Post Request Test:-");
            String url = "https://mocki.io/v1/bbb77b19-e2dc-454c-9b4d-a50db8fe99f6";
            URL obj = new URL(url);
            HttpURLConnection con = (HttpURLConnection) obj.openConnection();

            //add request header
            con.setRequestMethod("POST");
            //con.setRequestProperty("User-Agent", USER_AGENT);
            //con.setRequestProperty("Accept-Language", "en-US,en;q=0.5");
            //Data to be posted

            String fname = request.getParameter("firstname");
            String lname = request.getParameter("lastname");
            JSONObject json = new JSONObject();
            json.put("firstname", fname);
            json.put("lastname", lname);
            out.print(fname);
            out.print(lname);
            //out.print(con.getResponseCode());
            String urlParameters = "Firstname=" + fname + "&Lastname=" + lname;

            // Send post request
            con.setDoOutput(true);
            DataOutputStream wr = new DataOutputStream(con.getOutputStream());
            wr.writeBytes(String.valueOf(json));
            wr.flush();
            wr.close();

            int responseCode = con.getResponseCode();
            out.println("\nSending 'POST' request to URL : " + url);
            out.println("Post parameters : " + json);
            //out.println("Response Code : " + responseCode);

            BufferedReader in = new BufferedReader(
                    new InputStreamReader(con.getInputStream()));
            String inputLine;
            StringBuffer responseD = new StringBuffer();

            while ((inputLine = in.readLine()) != null) {
                responseD.append(inputLine);
            }
            in.close();

            //print result
            out.println("Response From The URL: " + responseD.toString());
            //response.sendRedirect("www.google.com");


        } catch (IOException ex) {
            ex.printStackTrace();
        } catch (JSONException e) {
            e.printStackTrace();
        } finally {
            if (input != null) {
                try {
                    input.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    @Override
    protected void doPost(@NotNull SlingHttpServletRequest req, @NotNull SlingHttpServletResponse res) throws IOException {


        PrintWriter out = res.getWriter();
        InputStream input = null;
        try {
            //String USER_AGENT = "Mozilla/5.0";

            out.println("HTTP Post Request Test:-");
            //add request header
            // con.setRequestMethod("POST");
            //Data to be posted
            String fname = req.getParameter("firstname");
            String lname = req.getParameter("lastname");
            String urlParameters = "Firstname=" + fname + "&Lastname=" + lname;
            CloseableHttpClient httpclient = HttpClients.createDefault();
            try {
                HttpPost httppost = new HttpPost("https://mocki.io/v1/bbb77b19-e2dc-454c-9b4d-a50db8fe99f6");
               httppost.addHeader("firstname",fname);
                httppost.addHeader("lastname",lname);
                out.print(httppost);

                CloseableHttpResponse response = httpclient.execute(httppost);
                try {
                    out.print(response.getStatusLine());
                    HttpEntity resEntity = response.getEntity();
                    if (resEntity != null) {
                        out.println(resEntity.getContentLength());
                    }
                    EntityUtils.consume(resEntity);
                } finally {
                    response.close();
                }
            } finally {
                httpclient.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

   /* private static final long serialVersionUID = 1L;
    @Reference
    private transient ResourceResolverFactory resourceResolverFactory;
    private static final Logger LOG = LoggerFactory.getLogger(CustomServlet.class);

    @Override
    protected void doGet(final SlingHttpServletRequest request, final SlingHttpServletResponse response) {
        response.setContentType("text/plain");
        response.setCharacterEncoding("UTF-8");
        LOG.info("Able to hit in");
        response.setStatus(SlingHttpServletResponse.SC_OK);
    }

    @Override
    protected void doPost(SlingHttpServletRequest req,
                          SlingHttpServletResponse resp) throws ServletException, IOException {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        try {
            resp.setContentType("text/plain");
            resp.getWriter().write("Simple Post Test");

        resp.sendRedirect("www.google.com");
        req = (SlingHttpServletRequest) new HttpGet("https://mocki.io/v1/bbb77b19-e2dc-454c-9b4d-a50db8fe99f6");
        String firstname = req.getParameter("firstname");
        String lastname = req.getParameter("lastname");
        int age = Integer.parseInt(req.getParameter(String.valueOf("age")));
        String gender = req.getParameter("gender");
        String address1 = req.getParameter("address1");
        String address2 = req.getParameter("address2");
        String city = req.getParameter("city");
        String states = req.getParameter("states");
        int pincode = Integer.parseInt(req.getParameter(String.valueOf("pincode")));
        resp = httpClient.execute(req);
        System.out.print(firstname);
        LOG.info(firstname);
        resp.getWriter().print("call");
        resp.sendRedirect("www.google.com");
      /*  final Map<String, Object > param = Collections.singletonMap(ResourceResolverFactory.SUBSERVICE, (Object) "getResourceResolver");
        ResourceResolver resourceResolver = null;

        try {
            resourceResolver = resourceResolverFactory.getServiceResourceResolver(param);
            Resource myResource = (Resource) resourceResolver.getResource("/content/usergenerated/data");
            //  if(myResource==null){
            Map<String, Object> properties3 = new HashMap<String, Object>();
            properties3.put("firstname",firstname);
            properties3.put("lastname",lastname);
            properties3.put("email",email);
            properties3.put("subject",subject);



        }
    }
}*/