I have a simple servlet named Autentica that is responsible to get de code parameter used to know the OAuth token. The API returns to my callback page and thus the servlet named callback is runned. The problem is that I cannot get the token from OAuth because I’m receibing error 400 from server. I’m not expert in programming web and maybe can be a newby error.
Anyone can help-me? Follows the servlet codes and the console results. Tks a lot!
1) Servlet Autentica
@WebServlet(name = "autentica", urlPatterns = {"/autentica"})
public class Autentica extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
processRequest(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
processRequest(req, resp);
}
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
//API Credentials
String client_id = "XXXX";
String client_secret = "YYYY";
String redirect_uri = "http://localhost:8080/InstagramAPI/callback";
//Set Session Variables
HttpSession session = request.getSession(true);
session.setAttribute("client_id", client_id);
session.setAttribute("client_secret", client_secret);
session.setAttribute("redirect_uri", redirect_uri);
try {
//Redirect User to foursquare login page
String url = "https://api.instagram.com/oauth/authorize/?client_id="
+ client_id + "&redirect_uri=" + redirect_uri
+ "&response_type=code";
response.sendRedirect(url);
} finally {
out.close();
}
}
}
2) Servlet Callback
@WebServlet(name = "callback", urlPatterns = {"/callback"})
public class Callback extends HttpServlet{
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
processRequest(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
processRequest(req, resp);
}
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
HttpSession session = request.getSession(true);
String clientID =(String)session.getAttribute("client_id");
String clientSecret =(String)session.getAttribute("client_secret");
String redirectURI =(String)session.getAttribute("redirect_uri");
String code = request.getParameter("code");
String url = "https://api.instagram.com/oauth/access_token?"
+ "client_id=" + clientID
+ "&client_secret=" + clientSecret
+ "&grant_type=authorization_code"
+ "&redirect_uri=" + redirectURI
+ "&code="+code;
getContent(url);
}
//Return response after GET Request
public String getContent(String httpurl){
try {
URL url = new URL(httpurl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
BufferedReader in = new BufferedReader(new InputStreamReader(
conn.getInputStream()));
String strLine = "";
String content = "";
while ((strLine = in.readLine()) != null){
content = content+strLine;
}
in.close();
System.out.println("DEBUG = "+content);
return content;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
3) Console
INFO: InstagramAPI was successfully deployed in 990 milliseconds.
SEVERE: java.io.IOException: Server returned HTTP response code: 400 for URL: https://api.instagram.com/oauth/access_token?client_id=XXXX&client_secret=YYYY&grant_type=authorization_code&redirect_uri=http://localhost:8080/InstagramAPI/callback&code=7049a73c0dfe43528115fe1a52ff4e0e
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1615)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)
at Callback.getContent(Callback.java:61)
at Callback.processRequest(Callback.java:52)
at Callback.doGet(Callback.java:29)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1542)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:849)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:746)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1045)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:228)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:722)
SEVERE: at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1615)
SEVERE: at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)
SEVERE: at Callback.getContent(Callback.java:61)
SEVERE: at Callback.processRequest(Callback.java:52)
SEVERE: at Callback.doGet(Callback.java:29)
SEVERE: at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
SEVERE: at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
SEVERE: at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1542)
SEVERE: at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
SEVERE: at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
SEVERE: at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
SEVERE: at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
SEVERE: at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
SEVERE: at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
SEVERE: at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
SEVERE: at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
SEVERE: at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
SEVERE: at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:849)
SEVERE: at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:746)
SEVERE: at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1045)
SEVERE: at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:228)
SEVERE: at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
SEVERE: at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
SEVERE: at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
SEVERE: at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
SEVERE: at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
SEVERE: at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
SEVERE: at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
SEVERE: at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
SEVERE: at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
SEVERE: at java.lang.Thread.run(Thread.java:722)
There is already a perfect answer for you over there!
You have to add something like:
after your
conn.setRequestMethod("POST");.