dom / latest / performanceresourcetiming / secureconnectionstart.html /

PerformanceResourceTiming.secureConnectionStart

The secureConnectionStart read-only property returns a timestamp immediately before the browser starts the handshake process to secure the current connection. If a secure connection is not used, the property returns zero.

Note: This feature is available in Web Workers

Value

If the resource is fetched over a secure connection, a DOMHighResTimeStamp immediately before the browser starts the handshake process to secure the current connection. If a secure connection is not used, this property returns zero.

Examples

In the following example, the value of the *Start and *End properties of all "resource" type events are logged.

function print_PerformanceEntries() {
  // Use getEntriesByType() to just get the "resource" events
  var p = performance.getEntriesByType("resource");
  for (var i=0; i < p.length; i++) {
    print_start_and_end_properties(p[i]);
  }
}
function print_start_and_end_properties(perfEntry) {
  // Print timestamps of the PerformanceEntry *start and *end properties
  properties = ["connectStart", "connectEnd",
                "domainLookupStart", "domainLookupEnd",
                "fetchStart",
                "redirectStart", "redirectEnd",
                "requestStart",
                "responseStart", "responseEnd",
                "secureConnectionStart"];

  for (var i=0; i < properties.length; i++) {
    // check each property
    var supported = properties[i] in perfEntry;
    if (supported) {
      var value = perfEntry[properties[i]];
      console.log("... " + properties[i] + " = " + value);
    } else {
      console.log("... " + properties[i] + " = NOT supported");
    }
  }
}

Specifications

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
secureConnectionStart
43
18
31
No
30
11
43
43
31
30
11
4.0

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https://developer.mozilla.org/en-US/docs/Web/API/PerformanceResourceTiming/secureConnectionStart