如何使用 Volley 将 POST 请求发送到本地服务器 PHP 脚本？

Question

I am trying to POST a value to a script running on a local server. My code is given below :

 final String data = "poet=nazmul";
        //Toast.makeText(getApplicationContext(), "ok", Toast.LENGTH_LONG).show();
        StringRequest request = new StringRequest(Request.Method.POST, "http://192.168.1.112:8080/api/post.php?" + data, new Response.Listener<String>() {
            @Override
            public void onResponse(String response) {
                Toast.makeText(getApplicationContext(), response, Toast.LENGTH_LONG).show();
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError volleyError) {
                Toast.makeText(getApplicationContext(), volleyError.toString(), Toast.LENGTH_LONG).show();
            }
        });
        AppController.getInstance().addToRequestQueue(request);

But the local server does not respond. My php code is:

<?php
 $poet = $_POST['poet']; 
 echo json_encode(array('poet'=>$poet));
?>

When I open the URL directly in a web browser, I get this error:

Notice: Undefined index: poet in C:\\xampp\\htdocs\\api\\post.php on line 2 {"poet":null}

How can I solve this problem? The main problem was windows firewall, it was preventing me from connecting to the local server, after disabling it and changing the php code $_POST to $_GET everything seems working fine.Thanks everyone for their help.

Answer 1

You're doing a get request because of the concatenation of ? and + data. If you change the server script $_POST to $_GET and change the Request.Method.POST to Request.Method.GET this will work.

Answer 2

You're submitting data to your script using POST (which doesn't matter in this case, but if it was changing something -- not idempotent -- you must do). Typically, data submitted using POST will have a request body that is sent along with the request, and not using URL parameters as you have here.

Both are fine, but unfortunately PHP's $_POST dictionary only gets values from the message body, and not the URL parameter (which $_GET references). To access them, you will need to parse the request URI yourself , by accessing the $_SERVER['REQUEST_URI'] variable.

If you are never going to make changes to your server's state with this request, it is appropriate to change the request type to GET. Please read this question and answers for more insight into the differences between GET and POST and using URL parameters.

Alternatively, if you don't want to change the PHP script at all, you need to modify your Android code to send the data in the request body (and not as a URL parameter). Please see this question on some approaches to doing that.