क्रोम एक्सटेंशन्स में क्रॉस-ओरिजिन रीडिंग ब्लॉकिंग (CORB)

var itemId = 12345;
var url = "https://another-site.com/price-query?itemId=" +
         encodeURIComponent(request.itemId);
fetch(url)
  .then(response => response.text())
  .then(text => parsePrice(text))
  .then(price => ...)
  .catch(error => ...)

chrome.runtime.sendMessage(
    {contentScriptQuery: "queryPrice", itemId: 12345},
    price => ...);

chrome.runtime.onMessage.addListener(
  function(request, sender, sendResponse) {
    if (request.contentScriptQuery == "queryPrice") {
      var url = "https://another-site.com/price-query?itemId=" +
          encodeURIComponent(request.itemId);
      fetch(url)
          .then(response => response.text())
          .then(text => parsePrice(text))
          .then(price => sendResponse(price))
          .catch(error => ...)
      return true;  // Will respond asynchronously.
    }
  });

{
  contentScriptQuery: "fetchUrl",
  url: "https://example.com/any/path/or/site/allowed/here"
}