How to send espacially characters with a http post request

Hello!

I am developing an android app with the 1.7.0.RC1 Titanium SDK. Now i try to realise a http post request. The post request should submit text from a textarea. The text can contain espacially characters.

My code looks like this:

var url = "http://myTestURL.de/mobile/feedback"; 
var xhr = Titanium.Network.createHTTPClient(); 
xhr.onreadystatechange = function() { 
     if (xhr.readyState == 4 || xhr.status == 200) { 
         var toast = Titanium.UI.createNotification({
             duration: 3000, message: "Successfully send msg."
         });
         toast.show();
     }
}
xhr.onerror = function(e) { 
     Ti.API.info('Error:' + e.error);
     var toast = Titanium.UI.createNotification({
             duration: 3000, message: "An Error occured."
     });
     toast.show();
};
 
xhr.setTimeout(20000);
xhr.open("POST", url);
xhr.setRequestHeader("User-Agent",Titanium.userAgent);
xhr.send(emailJsonData)

The variable 'emailJsonData', which is being used for xhr.send(), contains a string.

var emailJsonData = "json={email:" + emailadress + ",comment:" + textareaContent + "}";

And textareaContent contains espacial characters like such ,.@#$%&*-+()?/;:'"!~`|•??÷×{}][=_^°€¢£¥™®©¶\<>…„

Now, when i try to submit the text i get this error:

D/TiHttpClient( 1568): (kroll$1: app://app.js) [6,250686] Setting ready state to 1
I/TiAPI   ( 1568): (kroll$1: app://app.js) [17,250703] SEND DATA: json={email:'test@test.de',comment:'test,.@#$%&*-+()?/;:'"!~`|•??÷×{}][=_^°€¢£¥™®©¶\<>…„',app_Version:'1.0'}
I/TiAPI   ( 1568): (kroll$1: app://app.js) [2,250705] JSON PARSED SUCCESSFULLY!!!
I/TiAPI   ( 1568): (kroll$1: app://app.js) [1,250706] email undefined
D/TiHttpClient( 1568): (TiHttpClient-2) [233,250939] Setting ready state to 2
D/TiHttpClient( 1568): (TiHttpClient-2) [7,250946] Setting ready state to 3
D/TiHttpClient( 1568): (TiHttpClient-2) [12,250958] clearing the expired and idle connections
W/IdleConnectionHandler( 1568): Removing a connection that never existed!
E/TiHttpClient( 1568): (TiHttpClient-2) [12,250970] HTTP Error (org.apache.http.client.HttpResponseException): Internal Server Error
E/TiHttpClient( 1568): org.apache.http.client.HttpResponseException: Internal Server Error
E/TiHttpClient( 1568):  at ti.modules.titanium.network.TiHTTPClient$LocalResponseHandler.handleResponse(TiHTTPClient.java:210)
E/TiHttpClient( 1568):  at ti.modules.titanium.network.TiHTTPClient$LocalResponseHandler.handleResponse(TiHTTPClient.java:170)
E/TiHttpClient( 1568):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:657)
E/TiHttpClient( 1568):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:637)
E/TiHttpClient( 1568):  at ti.modules.titanium.network.TiHTTPClient$ClientRunnable.run(TiHTTPClient.java:1016)
E/TiHttpClient( 1568):  at java.lang.Thread.run(Thread.java:1096)
I/TiHttpClient( 1568): (TiHttpClient-2) [12,250982] Sending error Internal Server Error
I/TiAPI   ( 1568): (kroll$1: app://app.js) [3,250985] Error:Internal Server Error
I/NotificationService(   53): enqueueToast pkg=de.eves callback=android.app.ITransientNotification$Stub$Proxy@43da2ac8 duration=3000
D/dalvikvm(   53): threadid=15: bogus mon 1+0>0; adjusting

So, can anybody tell me, how to submit espacial characters within a http post request??? I have tried to escape the textarea-text with a backslash, but it didnt work. I have found out, that most problems occure with this & + " ; ' characters.

Greets, Jonas