Volley JsonObjectRequest Post parameters no longer

Question

I am trying to send POST parameters in a Volley JsonObjectRequest. Initially, it was working for me by following what the official code says to do of passing a JSONObject containing the parameters in the constructor of the JsonObjectRequest. Then all of a sudden it stopped working and I haven't made any changes to the code that was previously working. The server no longer recognizes that any POST parameters are being sent. Here is my code:

RequestQueue queue = Volley.newRequestQueue(this);
String url ="http://myserveraddress";

// POST parameters
Map<String, String> params = new HashMap<String, String>();
params.put("tag", "test");

JSONObject jsonObj = new JSONObject(params);

// Request a json response from the provided URL
JsonObjectRequest jsonObjRequest = new JsonObjectRequest
        (Request.Method.POST, url, jsonObj, new Response.Listener<JSONObject>()
        {
            @Override
            public void onResponse(JSONObject response)
            {
                Toast.makeText(getApplicationContext(), response.toString(), Toast.LENGTH_SHORT).show();
            }
        },
        new Response.ErrorListener()
        {
            @Override
            public void onErrorResponse(VolleyError error)
            {
                Toast.makeText(getApplicationContext(), error.toString(), Toast.LENGTH_SHORT).show();
            }
        });

// Add the request to the RequestQueue.
queue.add(jsonObjRequest);

Here is the simple tester PHP code on the server:

$response = array("tag" => $_POST["tag"]);
echo json_encode($response);

The response I get is {"tag":null}
Yesterday, it worked fine and was responding with {"tag":"test"}
I haven't changed a single thing, but today it is no longer working.

In the Volley source code constructor javadoc it says that you can pass a JSONObject in the constructor to send post parameters at "@param jsonRequest": https://android.googlesource.com/platform/frameworks/volley/+/master/src/main/java/com/android/volley/toolbox/JsonObjectRequest.java

/**
 * Creates a new request.
 * @param method the HTTP method to use
 * @param url URL to fetch the JSON from
 * @param jsonRequest A {@link JSONObject} to post with the request. Null is allowed and
 *       indicates no parameters will be posted along with request.

I have read other posts with similar questions, but the solutions haven't worked for me:

Volley JsonObjectRequest Post request not working

Volley Post JsonObjectRequest ignoring parameters while using getHeader and getParams

Volley not sending a post request with parameters.

I've tried setting the JSONObject in the JsonObjectRequest constructor to null, then overriding and setting the parameters in the "getParams()", "getBody()", and "getPostParams()" methods, but none of those overrides has worked for me. Another suggestion was to use an additional helper class that basically creates a custom request, but that fix is a bit too complex for my needs. If it comes down to it I will do anything to make it work, but I am hoping that there is a simple reason as to why my code was working, and then just stopped, and also a simple solution.

Answer 1

Use CustomJsonObjectRequest helper class mentioned here.

and implement like this -

CustomJsonObjectRequest request = new CustomJsonObjectRequest(Method.POST, URL, null, new Response.Listener<JSONObject>() {
    @Override
    public void onResponse(JSONObject response) {
        Toast.makeText(getActivity(), response.toString(), Toast.LENGTH_SHORT).show();
    }
}, new Response.ErrorListener() {
    @Override
    public void onErrorResponse(VolleyError error) {
        Toast.makeText(getActivity(), "Error.", Toast.LENGTH_SHORT).show();
    }
}) {
    @Override
    protected Map<String, String> getParams() throws AuthFailureError {
        Map<String, String> params = new HashMap<String, String>();
        params.put("id", id);
        params.put("password", password);
        return params;
    }
};
VolleySingleton.getInstance().addToRequestQueue(request);

Answer 2

I had a similar problem, but I found out that the problem was not on the client side, but in the server side. When you send a JsonObject, you need to get the POST object like this (in the server side):

In PHP:

$json = json_decode(file_get_contents('php://input'), true);

Answer 3

I had similar problem. But I found out that the problem was not on the server side, but the problem is about cache. You have to clear your RequestQueue Cache.

RequestQueue requestQueue1 = Volley.newRequestQueue(context);
requestQueue1.getCache().clear();

Answer 4

Using the JSONObject object to send parameters means the parameters will be in JSON format in the HTTP POST request body :

Map<String, String> params = new HashMap<String, String>();
params.put("tag", "test");
params.put("tag2", "test2");
JSONObject jsonObj = new JSONObject(params);

Will create this JSON object and insert it into the body of the HTTP POST request:

{"tag":"test","tag2":"test2"}

Then the server must decode the JSON to understand these POST parameters.

But normally HTTP POST paramaters are write in the body like:

tag=test&tag2=test2

But NOW here the question is why Volley is set in this manner?

A server reading a HTTP POST method should by standard always try to read parameters also in JSON (other than in plain text) and so a server that does not accomplish is a bad server?

Or instead a HTTP POST body with parameters in JSON is not what normally a server want?

Answer 5

"...Initially, it was working for me ....Then all of a sudden it stopped working and I haven't made any changes to the code "

if you haven't made any changes to a previously working code then I suggest checking other parameters such as URL , as the IP address may change if you are using your own Computer as a server!