WordPress at a glance
filter is not described

http_origin filter-hook . WP 3.4.0

Change the origin of an HTTP request.

Usage

add_filter( 'http_origin', 'filter_function_name_706' );
function filter_function_name_706( $origin ){
	// filter...

	return $origin;
}
$origin(string)
The original origin for the request.

Where the hook is called

get_http_origin()
wp-includes/http.php 408
return apply_filters( 'http_origin', $origin );

Where the hook is used (in WP core)

Does not used.