title: Chrome doesn't send cookie back to server for iframe
body: <p>I'm making a SPA with react router. With one route, I will have to show an authentication page from a third party via SAML 2.0 in a iframe. When the frame src is being loaded, the third party sets a cookie in iframe. However, Chrome doesn't send the cookie back received from the third party in iframe for following http requests in the same iframe.</p>
  
  <p>It's really appreciated if someone could shed the light on why Chrome behaves totally different from other browsers, such as Firefox, Safari?</p>