PerformanceResourceTiming.nextHopProtocol

The nextHopProtocol read-only property is a string representing the network protocol used to fetch the resource, as identified by the ALPN Protocol ID (RFC7301).

When a proxy is used, if a tunnel connection is established, this property returns the ALPN Protocol ID of the tunneled protocol. Otherwise, this property returns the ALPN Protocol ID of the first hop to the proxy.

Note: This feature is available in Web Workers.

Syntax

resource.nextHopProtocol;

Return value

A string representing the network protocol used to fetch the resource, as identified by the ALPN Protocol ID (RFC7301).

Example

The following example uses the nextHopProtocol property.

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_nextHopProtocol(p[i]);
  }
}
function print_nextHopProtocol(perfEntry) {
  var value = "nextHopProtocol" in perfEntry;
  if (value)
    console.log("nextHopProtocol = " + perfEntry.nextHopProtocol);
  else
    console.log("nextHopProtocol = NOT supported");
}

Specifications

Specification Status Comment
Resource Timing Level 1
The definition of 'nextHopProtocol' in that specification.
Candidate Recommendation Initial definition.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support61 Yes51 No No No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support6161 Yes No No No No

Document Tags and Contributors

 Last updated by: ExE-Boss,