POST request with filled form values to login - http

Question

I don't use javascript, so I'm completely new to it.
I have a link where I want to login per POST request. Just send a POST request with pre-defined correct login and password and get the data on the next page.
I'm using developer mode in Chrome to look on the requests sent by browser.
But when I type in correct combination of username and password, I don't see a single POST request, only GETs.
With incorrect username and password I'm able to see a POST request with following Form Data values:
xjxfun:_validateLogin
xjxr:1389197444586
xjxargs[]:<xjxobj>
<e><k>Username</k><v>SmyUsername</v></e>
<e><k>Password</k><v>SmyPassword</v></e>
<e><k>Autologin</k><v>S1</v></e>
<e><k>REFERER</k><v>Sdailyfield</v></e>
</xjxobj>
Here I typed in myUsername for Username and myPassword for Password.
My question is
What POST request do I need to send to this server to imitate form filling and submitting?
Thank you for answering. The best answer you can give is to describe the POST request with necessary data/headers/values, so that I can prove it fast in some REST client in browser

Answer 1

Here is the data I got sent from a valid login:
xjxfun:_validateLogin
xjxr:1389422948740
xjxargs[]:<xjxobj><e><k>Username</k><v>S<![CDATA[myemailhere]]></v></e><e><k>Password</k><v>Smypasswordhere</v></e><e><k>Autologin</k><v>S1</v></e><e><k>REFERER</k><v>Sdailyfield</v></e></xjxobj>
And this is what I got returned:
<?xml version="1.0" encoding="utf-8" ?><xjx><cmd cmd="js">Slocation.href = 'sudoku_des_tages.htm';</cmd></xjx>
By the way, this was a POST request.
I think the reason that you can only see GET requests, was because an HTTP redirect occurred on the server-side with your authentication details, and that request (as with all page requests) is a GET request, which is probably why you can only see GET requests with successful authentication.
Update: From what I understand, you are sending the values as header values (in others words, alongside Content-Type and the like), while you should send them in the post formdata. This is why you are finding your answer.

Answer 2

You can always use CURL :
$fields_string = '';
$url = "yourProceesfileURL";
$userdata = array(
'email' => youremail,
'password' => yourpassword
);
foreach ($userdata as $key => $value) {
$fields_string .= $key . '=' . $value . '&';
}
rtrim($fields_string, '&');
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, count($userdata));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $fields_string);
$result = curl_exec($ch);
curl_close($ch);
:)

Answer 3

Note: This solution was suggested when the question was tagged with JavaScript and PHP and without Objective-C.
You can use JQuery to simulate the form filling like this:
$(function(){
$('#Username').val('MyUsername');
$('#Password').val('MyPassword');
$('input[type=submit]').trigger("click");
});
Working example here
First you want to set the values by getting the input element with his id and then setting his value. Once you finish updating all the requested values just trigger the submit button.
This will simulate you filling the form and submitting it. To do this automatically I would use PHP to get the content of the page and then firing the JQuery function:
echo file_get_contents("http://www.sudoku-knacker.de/anmeldung.htm?ref=dailyfield");