Espruino Pico webserver

One difficulty is that on client side ajax I cannot make HTTP request with "Connection:Close" headers since they are forced to keep-alive.

Here is my client side request function:

var xhr;
function httpGetAsync(theUrl, jsonpcb, ok, err) {
	if (xhr && xhr.readyState != 4) {
		xhr.abort();
       }
	xhr = jQuery.ajax({
       type:'GET',
	   headers: {Connection: close}, // No effect
       url:theUrl,
       cache:false,
	   timeout: (60000),
	   jsonpCallback: jsonpcb,
	   crossDomain: true,
	   dataType: 'jsonp',
       error: err,
       success: ok,
	   beforeSend: function( xhr, settings ) {
         xhr.setRequestHeader( "Connection", "close" ); // No effect
		 settings.headers = {Connection: close}; // No effect
       }
    });
}

But still in wireshark I can see the request has "Connection : Keep-alive" in HTTP headers.