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

Value

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

Examples

The following example uses the nextHopProtocol property.

function printPerformanceEntries() {
  // Use getEntriesByType() to just get the "resource" events
  performance.getEntriesByType("resource")
    .forEach((entry) => {
      printNextHopProtocol(entry);
    });
}

function printNextHopProtocol(perfEntry) {
  console.log(`nextHopProtocol = ${perfEntry.nextHopProtocol ?? "NOT supported"}`);
}

Specifications

Specification
Resource Timing Level 2 # dom-performanceresourcetiming-nexthopprotocol

Browser compatibility

BCD tables only load in the browser