java-http запрос не работает для длинного текста

Я получаю код из интернета и пытаюсь отправить большой текст через http пост. Я не знаю наверняка, если этот код для http сообщения, но я верю в это. У меня есть страница php, где я получаю параметры и добавляю их в базу данных. Когда текст похож 5 6 символов метод отлично работает и обновляет базу данных. Когда я отправляю сообщение как 300 персонажей это не обновляет базу данных. Мой столбец сообщений в базе данных LONGTEXT тип. В чем может быть проблема? Заранее спасибо.

 public String sendMessage(String  username, String  tousername, String message) throws UnsupportedEncodingException
{
String params = "username="+ URLEncoder.encode(this.username,"UTF-8") +
"&password="+ URLEncoder.encode(this.password,"UTF-8") +
"&to=" + URLEncoder.encode(tousername,"UTF-8") +
"&message="+ URLEncoder.encode(message,"UTF-8") +
"&action="  + URLEncoder.encode("sendMessage","UTF-8")+
"&";
Log.i("PARAMS", params);
return socketOperator.sendHttpRequest(params);
}

public String sendHttpRequest(String params)
{
URL url;
String result = new String();
try
{
url = new URL(AUTHENTICATION_SERVER_ADDRESS);
HttpURLConnection connection;
connection = (HttpURLConnection) url.openConnection();
connection.setDoOutput(true);

PrintWriter out = new PrintWriter(connection.getOutputStream());

out.println(params);
out.flush();
out.close();

BufferedReader in = new BufferedReader(
new InputStreamReader(
connection.getInputStream()));
String inputLine;

while ((inputLine = in.readLine()) != null) {
result = result.concat(inputLine);
}
in.close();
}
catch (MalformedURLException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}

if (result.length() == 0) {
result = HTTP_REQUEST_FAILED;
}

return result;}

PHP-код

case "sendMessage":
if ($userId = authenticateUser($db, $username, $password))
{
if (isset($_REQUEST['to']))
{
$tousername = $_REQUEST['to'];
$message = $_REQUEST['message'];

$sqlto = "select Id from  users where username = '".$tousername."' limit 1";if ($resultto = $db->query($sqlto))
{
while ($rowto = $db->fetchObject($resultto))
{
$uto = $rowto->Id;
}
$sql22 = "INSERT INTO `messages` (`fromuid`, `touid`, `sentdt`,     `messagetext`) VALUES ('".$userId."', '".$uto."', '".DATE("Y-m-d H:i")."', '".$message."');";

error_log("$sql22", 3 , "error_log");
if ($db->query($sql22))
{
$out = SUCCESSFUL;
}
else {
$out = FAILED;
}
$resultto = NULL;
}

$sqlto = NULL;
}
}
else
{
$out = FAILED;
}
break;

echo out;class MySQL
{
private $dbLink;
private $dbHost;
private $dbUsername;
private $dbPassword;
private $dbName;
public  $queryCount;function MySQL($dbHost,$dbUsername,$dbPassword,$dbName)
{
$this->dbHost = $dbHost;
$this->dbUsername = $dbUsername;
$this->dbPassword = $dbPassword;
$this->dbName = $dbName;
$this->queryCount = 0;
}
function __destruct()
{
$this->close();
}
//connect to database
private function connect() {
$this->dbLink = mysql_connect($this->dbHost, $this->dbUsername, $this->dbPassword);
if (!$this->dbLink) {
$this->ShowError();
return false;
}
else if (!mysql_select_db($this->dbName,$this->dbLink)) {
$this->ShowError();
return false;
}
else {
mysql_query("set names latin5",$this->dbLink);
return true;
}
unset ($this->dbHost, $this->dbUsername, $this->dbPassword, $this->dbName);
}
/*****************************
* Method to close connection *
*****************************/
function close()
{
@mysql_close($this->dbLink);
}
/*******************************************
* Checks for MySQL Errors
* If error exists show it and return false
* else return true
*******************************************/
function ShowError()
{
$error = mysql_error();
//echo $error;
}
/****************************
* Method to run SQL queries
****************************/
function  query($sql)
{
if (!$this->dbLink)
$this->connect();

if (! $result = mysql_query($sql,$this->dbLink)) {
$this->ShowError();
return false;
}
$this->queryCount++;
return $result;
}
/************************
* Method to fetch values*
*************************/
function fetchObject($result)
{
if (!$Object=mysql_fetch_object($result))
{
$this->ShowError();
return false;
}
else
{
return $Object;
}
}
/*************************
* Method to number of rows
**************************/
function numRows($result)
{
if (false === ($num = mysql_num_rows($result))) {
$this->ShowError();
return -1;
}
return $num;
}
/*******************************
* Method to safely escape strings
*********************************/
function escapeString($string)
{
if (get_magic_quotes_gpc())
{
return $string;
}
else
{
$string = mysql_escape_string($string);
return $string;
}
}

function free($result)
{
if (mysql_free_result($result)) {
$this->ShowError();
return false;
}
return true;
}

function lastInsertId()
{
return mysql_insert_id($this->dbLink);
}

function getUniqueField($sql)
{
$row = mysql_fetch_row($this->query($sql));

return $row[0];
}
function testconnection() {
$this->dbLink = mysql_connect($this->dbHost, $this->dbUsername, $this->dbPassword);
if (!$this->dbLink) {
$this->ShowError();
return false;
}
else if (!mysql_select_db($this->dbName,$this->dbLink)) {
$this->ShowError();
return false;
}
else {
mysql_query("set names latin5",$this->dbLink);
return true;
}
unset ($this->dbHost, $this->dbUsername, $this->dbPassword, $this->dbName);
}
}