title: UnityWebRequest.downloadHandler returning null, while getting response from Node Server
body: <p>I am creating a Registration Scene on Unity. On the backend I have NodeJS server with MongoDB. Registration is successful and data is saved on Mongo too. </p>
  
  <p>This is my NodeJS api for <strong>register</strong></p>
  
  <pre><code>api.post('/register', (req,res) =&gt; {
  Account.register(new Account({username: req.body.username}), req.body.password, function(err, account){
    console.log("acc: "+account);
    if(err){
      if (err.name == "UserExistsError") {
        console.log("User Exists");
        return res.status(409).send(err);
      }else {
        console.log("User Error 500");
        return res.status(500).send(err);
      }
    }else {
      let newUser = new User();
      newUser.accountid = account._id;
      newUser.name = req.body.fullname;
      newUser.gender = req.body.gender;
      newUser.role = req.body.role;
      newUser.country = req.body.country;
      newUser.coins = req.body.coins;
      newUser.save(err =&gt; {
        if(err){
          console.log(err);
          return res.send(err);
        }else{
          console.log('user saved');
          res.json({ message: 'User saved' });
        }
      });
      passport.authenticate(
        'local', {
          session: false
        })(req,res, () =&gt; {
           res.json({ registermsg: 'Successfully created new account'});
        });
    }
  });
  });
  </code></pre>
  
  <p>And this is my <strong>POST</strong> co-routine in Unity C#</p>
  
  <pre><code>IEnumerator Post(string b) {
  
      byte[] bytes = System.Text.Encoding.ASCII.GetBytes(b);
  
      using (UnityWebRequest www = new UnityWebRequest(BASE_URL, UnityWebRequest.kHttpVerbPOST)) {
          UploadHandlerRaw uH = new UploadHandlerRaw(bytes);
          www.uploadHandler = uH;
          www.SetRequestHeader("Content-Type", "application/json");
          yield return www.Send();
  
          if (www.isError) {
              Debug.Log(www.error);
          } else {
              lbltext.text = "User Registered";
              Debug.Log(www.ToString());
              Debug.Log(www.downloadHandler.text);
          }
      }
  }
  </code></pre>
  
  <p>I am trying to <code>Debug.Log(www.downloadHandler.text);</code> but I get <code>NullReferenceException</code>.</p>
  
  <p>I'd like to ask, is the way I am using to return response in my api correct? If yes, how can I use that response in Unity side.</p>