Android Kotlin - Volley Unexpected response code 500

Question

I made REST API with Django Rest Framework. Currently, I'm working on a mobile app for my site. When I do POST request (it's my second POST request in my app) I'm getting this error:

E/Volley: [385] BasicNetwork.performRequest: Unexpected response code 500 for http://laude.ct8.pl/api/user/data/aktualizacja/

Here is my code:

private val UPDATE_URL = "http://laude.ct8.pl/api/user/data/aktualizacja/"
private var volleyRequest: RequestQueue? = null
private val jsonObj = JSONObject()

volleyRequest = Volley.newRequestQueue(this)

private fun aktualizacja() {

        jsonObj.put("librus_user", usernameEdit.text)
        jsonObj.put("librus_pswd", passwordEdit.text)

        val req = JsonObjectRequest(Request.Method.POST, UPDATE_URL, jsonObj,
                Response.Listener { response ->
                    Toast.makeText(this, response.toString(), Toast.LENGTH_LONG).show()
                    val user = Intent(this, UserActivity::class.java)
                    startActivity(user)
                },
                Response.ErrorListener { error ->
                    Toast.makeText(this, error.toString(), Toast.LENGTH_LONG).show()
                })
        req.retryPolicy = DefaultRetryPolicy(60000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT)

        volleyRequest!!.add(req)
    }

When I use same data on my website I'm not getting any errors, I got it only on a mobile app. Thanks for help !

Answer 1

The server error is caused by you making JsonObjectRequest and passing an JsonObject as a body of parameter while your server requires them as Strings(I observed the link!). The quick fix is to use StringRequest and pass your parameters as a String as ! Check the code below to get the idea!

private val UPDATE_URL = "http://laude.ct8.pl/api/user/data/aktualizacja/"
private var volleyRequest: RequestQueue? = null

volleyRequest = Volley.newRequestQueue(this)

private fun aktualizacja() {

        val req = object : StringRequest(Request.Method.POST,
                UPDATE_URL,
                Response.Listener { response ->
                Toast.makeText(this, response, Toast.LENGTH_LONG).show()
                val user = Intent(this, UserActivity::class.java)
                startActivity(user)

                }, Response.ErrorListener { e ->

               Toast.makeText(this, error.toString(), Toast.LENGTH_LONG).show()
        }) {
            public override fun getParams(): Map<String, String> {
                val params = HashMap<String, String>()
                params.put("username", usernameEdit.text)
                params.put("password", passwordEdit.text)
                return params
            }
        }
        req.retryPolicy = DefaultRetryPolicy(60000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT)

    volleyRequest!!.add(req)

}

You should also NOTE that the response is also a String so if you need it as a JSONOject convert it.

Sorry if you may get any errors in the code! I wrote the code in Java and convert to Kotlin using Android Studio!! I hope you will get the general idea!