SVC End points problem in Ajax call

I have below end point URL:

mobileinternetindialimited.api.crm5.dynamics.com/.../Organization.svc

I have created on custom entity called 'abc'. I need to retrieve data from this entity using ajax call.

Below is java script call:

var xHReq = new XMLHttpRequest();

var url="mobileinternetindialimited.api.crm5.dynamics.com/.../Organization.svc";
alert(xmlText);
xHReq.open("POST", url, true);
xHReq.setRequestHeader("SOAPAction", "schemas.microsoft.com/.../Retrieve");
xHReq.setRequestHeader("Content-Type", "text/xml; charset=utf-8");
xHReq.setRequestHeader("Accept", "application/xml, text/xml, */*");
xHReq.send(xmlText);

Issue:

This ajax call returns null value.

Kindly request to suggest solution for this problem.

Thanks,

Dharmesh