setAllowOriginHeader function
Implementation
void setAllowOriginHeader(HttpRequest request) {
request.response.headers.add(HttpHeaders.accessControlAllowOriginHeader, '*');
request.response.headers.add(HttpHeaders.accessControlAllowMethodsHeader,
'POST, GET, DELETE, PUT, OPTIONS');
request.response.headers.add(HttpHeaders.accessControlAllowHeadersHeader,
'Origin, X-Requested-With, Content-Type, Accept');
}