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POUsing HttpClient and HttpPost in Android with post parameters
 

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    <p>I'm writing code for an Android application that is supposed to take data, package it as Json and post it to a web server, that in turn is supposed to respond with json.</p> <p>Using a GET request works fine, but for some reason using POST all data seems to get stripped and the server does not receive anything.</p> <p>Here's a snippet of the code:</p> <pre><code>HttpParams params = new BasicHttpParams(); HttpConnectionParams.setConnectionTimeout(params, 5000); HttpConnectionParams.setSoTimeout(params, 5000); DefaultHttpClient httpClient = new DefaultHttpClient(params); BasicCookieStore cookieStore = new BasicCookieStore(); httpClient.setCookieStore(cookieStore); String uri = JSON_ADDRESS; String result = ""; String username = "user"; String apikey = "something"; String contentType = "application/json"; JSONObject jsonObj = new JSONObject(); try { jsonObj.put("username", username); jsonObj.put("apikey", apikey); } catch (JSONException e) { Log.e(TAG, "JSONException: " + e); } HttpPost httpPost = new HttpPost(uri); List&lt;NameValuePair&gt; postParams = new ArrayList&lt;NameValuePair&gt;(); postParams.add(new BasicNameValuePair("json", jsonObj.toString())); HttpGet httpGet = null; try { UrlEncodedFormEntity entity = new UrlEncodedFormEntity(postParams); entity.setContentEncoding(HTTP.UTF_8); entity.setContentType("application/json"); httpPost.setEntity(entity); httpPost.setHeader("Content-Type", contentType); httpPost.setHeader("Accept", contentType); } catch (UnsupportedEncodingException e) { Log.e(TAG, "UnsupportedEncodingException: " + e); } try { HttpResponse httpResponse = httpClient.execute(httpPost); HttpEntity httpEntity = httpResponse.getEntity(); if (httpEntity != null) { InputStream is = httpEntity.getContent(); result = StringUtils.convertStreamToString(is); Log.i(TAG, "Result: " + result); } } catch (ClientProtocolException e) { Log.e(TAG, "ClientProtocolException: " + e); } catch (IOException e) { Log.e(TAG, "IOException: " + e); } return result; </code></pre> <p>I think I have followed the general guidelines on how to create the parameters and post them, but apparently not.</p> <p>Any help or pointers to where I can find a solution, are very welcome at this point (after spending a few hours realizing no post data was ever sent). The real server is running Wicket on Tomcat, but I've also tested it out on a simple PHP page, with no difference.</p>
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    1. CO**Update with solution _(that work at least for me in this particular case)_:** I removed all method calls that set the `Content-Type` and now it works. The only content-type method call that is allowed in this case is the `httpPost.setHeader("Accept", contentType);`.
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    2. COThis is because UrlEncodedFormEntity set the content type to application/x-www-form-urlencoded. If you change the content-type to something else (application/json for example) the server won't be able to parse your request parameters.
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