title: ProtocolException: unexpected end of stream
body: <p>I've been dealing with an issue that keeps coming back and I'm getting quite frustrated. I'm trying to connect to my database via a template php webservice that I found online, by sending it JSONObjects. I keep getting either an IOException or ProtocolException when trying to get a response code from the server with the cause being "Unexpected end of stream". The error message is really cryptic and I have no idea is the error is in the java or the PHP code. I posted the code, so you can take a look:</p>
  
  <p>Stack trace:
  <div class="snippet" data-lang="js" data-hide="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>java.net.ProtocolException: unexpected end of stream
       at com.android.okhttp.internal.http.HttpConnection$FixedLengthSink.close(HttpConnection.java:314)
       at com.android.okhttp.internal.http.HttpEngine.readResponse(HttpEngine.java:781)
       at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:443)
       at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:388)
       at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:501)
       at ske.matej.project.JSONParser.getJSONFromUrl(JSONParser.java:56)
       at ske.matej.project.UserFunctions.loginUser(UserFunctions.java:35)
       at ske.matej.project.LoginActivity$AttemptLogin.doInBackground(LoginActivity.java:145)
       at ske.matej.project.LoginActivity$AttemptLogin.doInBackground(LoginActivity.java:121)
       at android.os.AsyncTask$2.call(AsyncTask.java:295)
       at java.util.concurrent.FutureTask.run(FutureTask.java:237)
       at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
       at java.lang.Thread.run(Thread.java:818)</code></pre>
  </div>
  </div>
  </p>
  
  <p>JSONParser.java (I marked the offending line with a comment)</p>
  
  <pre class="lang-java prettyprint-override"><code>import android.util.Log;
  
  import org.json.JSONException;
  import org.json.JSONObject;
  
  import java.io.BufferedInputStream;
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.io.OutputStream;
  import java.io.OutputStreamWriter;
  import java.io.UnsupportedEncodingException;
  import java.net.HttpURLConnection;
  import java.net.URL;
  
  
  public class JSONParser {
  
      private JSONObject jsonObj = new JSONObject();
      private JSONObject json = new JSONObject();
      private String email;
      private String username;
      private String password;
      private int objLength;
      private static InputStream is = null;
  
      public JSONParser() {
          //Default constructor intentionally left empty for now
      }
  
      public JSONObject getJSONFromUrl(String _url, JSONObject params) {
  
          // Making HTTP request
          try {
              URL url = new URL(_url);
              HttpURLConnection conn = (HttpURLConnection) url.openConnection();
  
              byte[] bytearray = params.toString().getBytes("UTF-8");
  
              conn.setDoOutput(true);
              conn.setDoInput(true);
              conn.setRequestMethod("POST");
              conn.setFixedLengthStreamingMode(bytearray.length);
              //conn.setRequestProperty("User-Agent", "GYUserAgentAndroid");
              conn.setRequestProperty("Content-Length", Integer.toString(bytearray.length));
              conn.setRequestProperty("Content-Type", "application/json");
              //conn.setUseCaches(false);
  
              System.out.println("Byte array length: "+bytearray.length);
  
              //The offending line                
              int responseCodeHTTP = conn.getResponseCode(); 
  
              System.out.println("Responsecode HTTP "+responseCodeHTTP);
  
              OutputStream os = conn.getOutputStream();
              os.write(bytearray);
              os.flush();
  
              if (responseCodeHTTP == HttpURLConnection.HTTP_OK) {
                  try {
                      is = new BufferedInputStream(conn.getInputStream());
                      BufferedReader reader = new BufferedReader(new InputStreamReader(
                              is, "UTF-8"), 8);
                      StringBuilder sb = new StringBuilder();
                      String line = null;
                      while ((line = reader.readLine()) != null) {
                          sb.append(line);
                      }
                      is.close();
                      json = new JSONObject(sb.toString());
                      Log.e("JSON", json.toString());
                  }
                  catch (JSONException e) {
                      e.printStackTrace();
                  }
              }
  
          } catch (UnsupportedEncodingException e) {
              e.printStackTrace();
          } catch (IOException e) {
              e.printStackTrace();
          }
  
          return json;
  
      }
  
      public byte[] getJSONBytes() {
          try {
              return jsonObj.toString().getBytes("UTF-8");
          }
          catch(UnsupportedEncodingException e) {
              e.printStackTrace();
              return null;
          }
      }
  }
  </code></pre>
  
  <p>index.php (I didn't change much in the code yet, just want to establish a connection for now)</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>&lt;?php
   
  if($_POST != null) {
   
   echo json_encode("Status: 200");
   
   if (isset($_POST['tag']) &amp;&amp; $_POST['tag'] != '') {
      // Get tag
      $tag = $_POST['tag'];
   
      // Include Database handler
      require_once 'DB_Functions.php';
      $db = new DB_Functions();
      // response Array
      $response = array("tag" =&gt; $tag, "success" =&gt; 0, "error" =&gt; 0);
   
      // check for tag type
      if ($tag == 'login') {
          // Request type is check Login
          $email = $_POST['email'];
          $password = $_POST['password'];
   
          // check for user
          $user = $db-&gt;getUserByEmailAndPassword($email, $password);
    
    
    //FOR TESTING PURPOSES: REMOVE LATER
    $user = false;
    
    
          if ($user != false) {
              // user found
              // echo json with success = 1
              $response["success"] = 1;
              $response["user"]["fname"] = $user["firstname"];
              $response["user"]["lname"] = $user["lastname"];
              $response["user"]["email"] = $user["email"];
          $response["user"]["uname"] = $user["username"];
              $response["user"]["uid"] = $user["unique_id"];
              $response["user"]["created_at"] = $user["created_at"];
   
              echo json_encode($response);
          } else {
              // user not found
              // echo json with error = 1
              $response["error"] = 1;
              $response["error_msg"] = "Incorrect email or password!";
              echo json_encode($response);
          }
      }
    else if ($tag == 'chgpass'){
    $email = $_POST['email'];
   
    $newpassword = $_POST['newpas'];
   
    $hash = $db-&gt;hashSSHA($newpassword);
          $encrypted_password = $hash["encrypted"]; // encrypted password
          $salt = $hash["salt"];
    $subject = "Change Password Notification";
           $message = "Hello User,nnYour Password is sucessfully changed.nnRegards,nLearn2Crack Team.";
            $from = "contact@learn2crack.com";
            $headers = "From:" . $from;
      if ($db-&gt;isUserExisted($email)) {
   
   $user = $db-&gt;forgotPassword($email, $encrypted_password, $salt);
  if ($user) {
           $response["success"] = 1;
            mail($email,$subject,$message,$headers);
           echo json_encode($response);
  }
  else {
  $response["error"] = 1;
  echo json_encode($response);
  }
   
              // user is already existed - error response
   
          }
             else {
   
              $response["error"] = 2;
              $response["error_msg"] = "User not exist";
               echo json_encode($response);
   
  }
  }
  else if ($tag == 'forpass'){
  $forgotpassword = $_POST['forgotpassword'];
   
  $randomcode = $db-&gt;random_string();
   
  $hash = $db-&gt;hashSSHA($randomcode);
          $encrypted_password = $hash["encrypted"]; // encrypted password
          $salt = $hash["salt"];
    $subject = "Password Recovery";
           $message = "Hello User,nnYour Password is sucessfully changed. Your new Password is $randomcode . Login with your new Password and change it in the User Panel.nnRegards,nLearn2Crack Team.";
            $from = "contact@learn2crack.com";
            $headers = "From:" . $from;
      if ($db-&gt;isUserExisted($forgotpassword)) {
   
   $user = $db-&gt;forgotPassword($forgotpassword, $encrypted_password, $salt);
  if ($user) {
           $response["success"] = 1;
            mail($forgotpassword,$subject,$message,$headers);
           echo json_encode($response);
  }
  else {
  $response["error"] = 1;
  echo json_encode($response);
  }
   
              // user is already existed - error response
   
          }
             else {
   
              $response["error"] = 2;
              $response["error_msg"] = "User not exist";
               echo json_encode($response);
   
  }
   
  }
  else if ($tag == 'register') {
          // Request type is Register new user
          $fname = $_POST['fname'];
          $lname = $_POST['lname'];
          $email = $_POST['email'];
          $uname = $_POST['uname'];
          $password = $_POST['password'];
   
          // check if user is already existed
          if ($db-&gt;isUserExisted($email)) {
              // user is already existed - error response
              $response["error"] = 2;
              $response["error_msg"] = "User already existed";
              echo json_encode($response);
          }
             else if(!$db-&gt;validEmail($email)){
              $response["error"] = 3;
              $response["error_msg"] = "Invalid Email Id";
              echo json_encode($response);
  }
  else {
              // store user
              $user = $db-&gt;storeUser($fname, $lname, $email, $uname, $password);
              if ($user) {
                  // user stored successfully
              $response["success"] = 1;
              $response["user"]["fname"] = $user["firstname"];
              $response["user"]["lname"] = $user["lastname"];
              $response["user"]["email"] = $user["email"];
          $response["user"]["uname"] = $user["username"];
              $response["user"]["uid"] = $user["unique_id"];
              $response["user"]["created_at"] = $user["created_at"];
                 mail($email,$subject,$message,$headers);
   
                  echo json_encode($response);
              } else {
                  // user failed to store
                  $response["error"] = 1;
                  $response["error_msg"] = "JSON Error occured in Registartion";
                  echo json_encode($response);
              }
          }
      } else {
           $response["error"] = 3;
           $response["error_msg"] = "JSON ERROR";
          echo json_encode($response);
      }
  } else {
      echo "";
  }
  }
   
  ?&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>I really appreciate any help you can give. Especially because I'm still a noob in Android development and PHP.</p>