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Asked: 2026-06-02T21:50:55+00:00

I am trying to build a small application in which the application will communicate

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I am trying to build a small application in which the application will communicate with a php script with the help of JSON objects. I successfully implemented the GET Request test application but using JSON with post is creating problems. The code generates no error but my php script reply with no nothing except an empty Array() which implies that nothing was sent over the connection with code:

<?php  print_r($_REQUEST);  ?>

and trying with

<?php  print($_REQUEST['json']); ?>

throws HTML back to the application with json variable not found error.

I have already tried a few solutions mentioned here including: How to send a JSON object over Request with Android? and How to send a json object over httpclient request with android so it would be great if you can point out my mistake and can briefly describe what exactly I was doing wrong. Thanks.

Here is the code snippet for from where the JSON Object is converted into string and then attached to a Post variable.

        DefaultHttpClient httpclient = new DefaultHttpClient();
        HttpPost httppostreq = new HttpPost(wurl);
        StringEntity se = new StringEntity(jsonobj.toString());
        se.setContentType(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
        httppostreq.setEntity(se);
            //httppostreq.setHeader("Accept", "application/json");
        //httppostreq.setHeader("Content-type", "application/json");
        //httppostreq.setHeader("User-Agent", "android");
        HttpResponse httpresponse = httpclient.execute(httppostreq);
        HttpEntity resultentity = httpresponse.getEntity();

Here is TCP Stream Dump collected through wireshark if it can help:

POST /testmysql.php?test=true HTTP/1.1
Content-Length: 130
Content-Type: application/json;charset=UTF-8
Content-Type: application/json;charset=UTF-8
Host: 192.168.100.4
Connection: Keep-Alive
User-Agent: Apache-HttpClient/UNAVAILABLE (java 1.4)
{"weburl":"hashincludetechnology.com","header":{"devicemodel":"GT-I9100","deviceVersion":"2.3.6","language":"eng"},"key":"value"}HTTP/1.1 200 OK
Date: Mon, 30 Apr 2012 22:43:10 GMT
Server: Apache/2.2.17 (Win32)
Content-Length: 34
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html
Array
(
    [test] => true
)
Test // echo statement left intentionally.
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1 Answer

  1. Editorial Team

    you are using PHP on the server side, so your HTTP entity must be a multipart encoded one. See this link. You are using a string entity, but this is not correct. It must be a MultipartEntity, which emulates what the browser does when you submit a form in a web page. MultipartEntity should be in httpmime jar.

    Once you have your multipart entity, simply add a Part named “json”, and set its contents to the string representation of your json-encoded object.

    Note that this answer is because you use PHP on the server side, so you must use its “protocol” to read variables via $_REQUEST. If you used your own request parser oh the server side, even a StringEntity could be ok. See HTTP_RAW_POST_DATA

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