400 Bad Request On Mobile Api

[winsonkong05 (Winson Kong)]

Hi, i try to create a return XML API,

Basically i generate a "XML" model & CRUD , and use xml/index to receive their $_POST request

this is some example request

1. User Sign Up （function = signUP）

Submit（$_POST）: first name, last name, password, email address, gender, date of birth,function=""

Return(XML Format): Sign Up status (successful with user ID, failed, or email taken, etc)

2. User Sign In （function = signIn）

Submit（$_POST）: email, password

Return(XML Format): Sign In status (successful with user ID or failed)

---

if(isset($_POST[‘function’]))

{

$function = $_POST[‘function’];

  switch ($function) {


case "signUp":


	$first_name = $_POST['first_name'];


	$last_name = $_POST['last_name'];


	$email = $_POST['email'];


	$gender = $_POST['gender'];


	$password = $_POST['password'];


            $attr=array(


	'first_name'=>$first_name,


	'last_name'=>$last_name,


	'email'=>$email,


	'gender'=>$gender,


	'password'=>$password);


	echo Xml::model()->signUp($attr);


	break;


             .


             .


             .

---

i also try to create a test form in "xml/test"

<form action=".../index.php?r=xml/index" method="post">

<input type="text" name="first_name" value="name">

<input type="text" name="last_name" value="last name">

<input type="text" name="email" value="name@email.com">

<input type="text" name="gender" value="male">

<input type="text" name="password" value="123456">

<input type="text" name="verifypassword" value="123456">

<input type="text" name="function" value="signUp">

</form>

after submit will respond format like this

<div id="content">

<!–?xml version="1.0"?–>

<xmlreturn type="documentary">

<return>

<signup_status>success</signup_status>

<user_id>45</user_id>

</return>

</xmlreturn>

</div>

This is format that mobile developer request.

but than after developer test in their mobile systems, they show "[color="#FF0000"]400 bad request,your browser send a request that this server could not understand[/color]".

What is the problem? is it because urlmanager?