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Custom request header not getting fetched in WCF project?
$.ajax({
    type: "POST",
    contentType: "application/json; charset=utf-8",
    beforeSend: function (xhr) {
        xhr.setRequestHeader("My-Key", 'MyKey123456789');
    },
    url: "http://xyz.com/Myhandler.ashx",
    data: '{"userName":"test","password":"test"}',
    dataType: "json",
    success: function (response) {
        alert(response.HelloWorldResult);
    },
    error: function (message) {
        alert("error has occured");
    }
});

public void ProcessRequest(HttpContext context)
    {
context.Request.Headers["My-Key"]

http://xyz.com/services/MyService.svc/mymethod

public override void ProcessRequest(ref RequestContext requestContext)
{