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HttpPost return a empty body

I have the code below, and my problem is that the response.status is 200 (is ok) and my response body is empty and it should return a json response. Is the problem the length maybe?:`
HttpPost post = new HttpPost("http://localhost:8080/rest/login");
httpClient = HttpClients.createDefault();
List<NameValuePair> formParams = new ArrayList<NameValuePair>();
NameValuePair pair = new BasicNameValuePair("token",token);
formParams.add(pair);
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formParams);
post.setEntity(entity);
HttpResponse response = httpClient.execute(post);
this.code = response.getStatusLine().getStatusCode();
InputStream body = response.getEntity().getContent();
BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));`

I had similar problem. In my case it was also very strange, that when url contained IP instead of hostname, it worked (I get the nonempty response).
However, setting netscape cookie specs helped in my case.
httpClientBuilder.setDefaultRequestConfig(RequestConfig.custom()
.setCookieSpec(CookieSpecs.NETSCAPE)
.build());

java sending UTF-16 data to PHP not working

I'm sending data to php from java using JSON, using following code:
String url = "abc.php";
JSONObject json = new JSONObject();
json.put("msg", message); // message: "\ud83d\udc4d \ud83d\udc4e"
HttpClient client = new DefaultHttpClient();
HttpConnectionParams.setConnectionTimeout(client.getParams(), 100000);
HttpPost post = new HttpPost(url);
StringEntity se = new StringEntity("json="+json.toString());
post.addHeader("content-type", "application/x-www-form-urlencoded");
post.setEntity(se);
HttpResponse response;
response = client.execute(post);
String resFromServer = org.apache.http.util.EntityUtils.toString(response.getEntity());
Log.i("resFromServer", resFromServer);
The PHP code is:
if( isset($_POST["json"]) ) {
$jsonDecode = json_decode($_POST["json"]);
$msg = $jsonDecode->{"msg"};
echo $msg;
}
But I'm getting output as ????
Whereas output should be 👍 👎
Is there some encoding issue? How can this be fixed?

Try , first converting the requested content to utf8
Those strings might not be UTF-16 actually. So do it safe and try
if( isset($_POST["json"]) ) {
$string=$_POST['json'];
$jsonDecode = mb_convert_encoding($string, "UTF-8", mb_detect_encoding($string));
$jsonDecode = json_decode($jsonDecode);
$msg = $jsonDecode->{"msg"};
echo $msg;
}

Why am I getting HTTP 400 bad request

I am using an HTTP client (code copied from http://www.mkyong.com/java/apache-httpclient-examples/) to send post requests. I have been trying to use it with http://postcodes.io to look up a bulk of postcodes but failed. According to http://postcodes.io I should send a post request to http://api.postcodes.io/postcodes in the following JSON form: {"postcodes" : ["OX49 5NU", "M32 0JG", "NE30 1DP"]} but I am always getting HTTP Response Code 400.
I have included my code below. Please tell me what am I doing wrong?
Thanks
private void sendPost() throws Exception {
String url = "http://api.postcodes.io/postcodes";
HttpClient client = HttpClientBuilder.create().build();
HttpPost post = new HttpPost(url);
List<NameValuePair> urlParameters = new ArrayList<NameValuePair>();
urlParameters.add(new BasicNameValuePair("postcodes", "[\"OX49 5NU\", \"M32 0JG\", \"NE30 1DP\"]"));
post.setEntity(new UrlEncodedFormEntity(urlParameters));
HttpResponse response = client.execute(post);
System.out.println("Response Code : "
+ response.getStatusLine().getStatusCode());
System.out.println("Reason : "
+ response.getStatusLine().getReasonPhrase());
BufferedReader br = new BufferedReader(
new InputStreamReader(response.getEntity().getContent()));
StringBuffer result = new StringBuffer();
String line = "";
while ((line = br.readLine()) != null) {
result.append(line);
}
br.close();
System.out.println(result.toString());
}

This works, HTTP.UTF_8 is deprecated:
String url = "http://api.postcodes.io/postcodes";
HttpClient client = HttpClientBuilder.create().build();
HttpPost post = new HttpPost(url);
StringEntity params =new StringEntity("{\"postcodes\" : [\"OX49 5NU\", \"M32 0JG\", \"NE30 1DP\"]}");
post.addHeader("Content-Type", "application/json");
post.setEntity(params);

Jon Skeet is right (as usual, I might add), you are basically sending a form and it defaults to form-url-encoding.
You could try something like this instead:
String jsonString = "{\"postcodes\" : [\"OX49 5NU\", \"M32 0JG\", \"NE30 1DP\"]}";
StringEntity entity = new StringEntity(jsonObj.toString(), HTTP.UTF_8);
entity.setContentType("application/json");
post.setEntity(entity);

Android: HttpPost not work

Hi guy's (sorry for my english error :P ) i have a problem, I'm trying to post a variable (id_art) to a php page, the problem is that I can't understand if the variable is not sent properly, or if I read it wrong php side.
JAVA CODE:
HttpClient httpclient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(myurl);
StringBuilder builder = new StringBuilder();
String json, result = "";
//Build jsonObject
JSONObject jsonObject = new JSONObject();
jsonObject.accumulate("id_articolo", id_art);
//Convert JSONObject to JSON to String
json = jsonObject.toString();
//Set json to StringEntity
StringEntity se = new StringEntity(json);
//Set httpPost Entity
httpPost.setEntity(se);
//Set some headers to inform server about the type of the content
httpPost.setHeader("Accept", "application/json");
httpPost.setHeader("Content-type", "application/json");
//Execute POST request to the given URL
HttpResponse httpResponse = httpclient.execute(httpPost);
//Receive response as inputStream
StatusLine statusLine = httpResponse.getStatusLine();
int statusCode = statusLine.getStatusCode();
//Convert input stream to string
if (statusCode == 200){
HttpEntity entity = httpResponse.getEntity();
InputStream content = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(content));
String line="";
while ((line = reader.readLine()) != null) {
builder.append(line);
result = builder.toString();
}
System.out.println("DEBUG"+" "+result);
PHP CODE
<?php
include_once('configurazione.php');
header("Content-Type: application/json");
mysql_set_charset('utf8');
$value = json_decode(stripslashes($_POST),true);
var_dump($value);
?>
result is NULL... Why ????
Tnks 4 help
EDIT 1
I try to edit my php code replacing
this : json_decode(stripslashes($_POST),true);
with: $value = json_decode($_POST);
But the result is the same.. NULL
EDIT 2
I try to replace
in .JAVA
httpPost.setEntity(new StringEntity(yourJson.toString(),"UTF-8"));
in .PHP
$value = json_decode(file_get_contents('php://input'));
echo $value ;
but result is NULL

in .JAVA
httpPost.setEntity(new StringEntity(yourJson.toString(),"UTF-8"));
in .PHP
$value = file_get_contents('php://input');
var_dump(json_decode($value , true));

try with this
in .JAVA
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
nameValuePairs.add(new BasicNameValuePair("json", yourJson.toString()));
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
in .PHP
$value = $_POST['json'];
var_dump(json_decode($value , true));

I believe you cannot simply send StringEntity, because POST parameters are expected to be key=>value pairs. That means you need to give a name to your parameter, let's say json.
Then you can do this:
JSONObject jsonObject = new JSONObject();
// here you can set up the data
HttpPost httppost = new HttpPost(URL);
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("json", jsonObject.toString()));
// here you can add more POST data using nameValuePairs.add()
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
On the PHP side, you'll just do
$value = json_decode($_POST['json'], true);
var_dump($value);

Removing White spaces from a string for http connection

I am trying to send a query url
String url = String.format(
"http://xxxxx/xxx/xxx&message=%s",myEditBox.getText.toString());
// Create a new HttpClient and Post Header
DefaultHttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
httpclient.getCookieStore().addCookie(cooki);
try {
ResponseHandler<String> responseHandler = new BasicResponseHandler();
httpclient.getParams().setParameter("http.connection-manager.timeout", 15000);
String response = httpclient.execute(httppost, responseHandler);
gives me error, illegal character at query. That's white space probably. How to deal with this issue?
Best Regards

You need to encode your url.
String query = URLEncoder.encode(myEditBox.getText.toString(), "utf-8");
String url = "http://stackoverflow.com/search?q=" + query;

Can you try
httpclient.setRequestProperty("Accept-Charset","UTF-8");
url="http://xxxxx/xxx/xxx&message="+URLEncoder.encode(myEditBox.getText.toString(), "UTF-8");

Try .trim() while get value from edittext.
May be whitespace come from edittext and also use "utf-8".
see below code.
String value = URLEncoder.encode(myEditBox.getText.toString().trim(), "utf-8");
String url = "http://xxxxx/xxx/xxx&message=%s" + value;