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(fun(){if(dot.addeventlistener&&window.xmlhttprequest&&json&&json.stringify){var e=fun(a){var eelementbyid("error-feedback-survey"),d=dot.getelementbyid("error-feedback-suess"),b=new xmlhttprequest;a={event:"feedback clicked",properties:{errorcode:520,helpful:a,version:1}};b.open("post",");b.setrequestheader("tent-type","application/json");b.setrequestheader("sparrow-source-key","c771f0e4b54944bebf4261d44bd79a1e");
<title> | 520: web server is returning an unknown error</title>
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b.send(json.stringify(a));c.csslist.add("feedback-hidden");d.csslist.remove("feedback-hidden")};dot.addeventlistener("domtentloaded",fun(){var a=dot.getelementbyid("error-feedback"),eelementbyid("feedback-button-yes"),d=dot.getelementbyid("feedback-button-no");"csslist"in a&&(a.csslist.remove("feedback-hidden"),c.addeventlistener("click",fun(){e(!0)}),d.addeventlistener("click",fun(){e(!1)}))})}})();
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