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Runtime error
File size: 4,430 Bytes
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chrome_load_times = """
if (!window.chrome) {
// Use the exact property descriptor found in headful Chrome
// fetch it via `Object.getOwnPropertyDescriptor(window, 'chrome')`
Object.defineProperty(window, 'chrome', {
writable: true,
enumerable: true,
configurable: false, // note!
value: {} // We'll extend that later
})
}
// That means we're running headful and don't need to mock anything
if ('loadTimes' in window.chrome) {
throw new Error('skipping chrome loadtimes update, running in headfull mode')
}
// Check that the Navigation Timing API v1 + v2 is available, we need that
if (
window.performance ||
window.performance.timing ||
window.PerformancePaintTiming
) {
const {performance} = window
// Some stuff is not available on about:blank as it requires a navigation to occur,
// let's harden the code to not fail then:
const ntEntryFallback = {
nextHopProtocol: 'h2',
type: 'other'
}
// The API exposes some funky info regarding the connection
const protocolInfo = {
get connectionInfo() {
const ntEntry =
performance.getEntriesByType('navigation')[0] || ntEntryFallback
return ntEntry.nextHopProtocol
},
get npnNegotiatedProtocol() {
// NPN is deprecated in favor of ALPN, but this implementation returns the
// HTTP/2 or HTTP2+QUIC/39 requests negotiated via ALPN.
const ntEntry =
performance.getEntriesByType('navigation')[0] || ntEntryFallback
return ['h2', 'hq'].includes(ntEntry.nextHopProtocol)
? ntEntry.nextHopProtocol
: 'unknown'
},
get navigationType() {
const ntEntry =
performance.getEntriesByType('navigation')[0] || ntEntryFallback
return ntEntry.type
},
get wasAlternateProtocolAvailable() {
// The Alternate-Protocol header is deprecated in favor of Alt-Svc
// (https://www.mnot.net/blog/2016/03/09/alt-svc), so technically this
// should always return false.
return false
},
get wasFetchedViaSpdy() {
// SPDY is deprecated in favor of HTTP/2, but this implementation returns
// true for HTTP/2 or HTTP2+QUIC/39 as well.
const ntEntry =
performance.getEntriesByType('navigation')[0] || ntEntryFallback
return ['h2', 'hq'].includes(ntEntry.nextHopProtocol)
},
get wasNpnNegotiated() {
// NPN is deprecated in favor of ALPN, but this implementation returns true
// for HTTP/2 or HTTP2+QUIC/39 requests negotiated via ALPN.
const ntEntry =
performance.getEntriesByType('navigation')[0] || ntEntryFallback
return ['h2', 'hq'].includes(ntEntry.nextHopProtocol)
}
}
const {timing} = window.performance
// Truncate number to specific number of decimals, most of the `loadTimes` stuff has 3
function toFixed(num, fixed) {
var re = new RegExp('^-?\\d+(?:.\\d{0,' + (fixed || -1) + '})?')
return num.toString().match(re)[0]
}
const timingInfo = {
get firstPaintAfterLoadTime() {
// This was never actually implemented and always returns 0.
return 0
},
get requestTime() {
return timing.navigationStart / 1000
},
get startLoadTime() {
return timing.navigationStart / 1000
},
get commitLoadTime() {
return timing.responseStart / 1000
},
get finishDocumentLoadTime() {
return timing.domContentLoadedEventEnd / 1000
},
get finishLoadTime() {
return timing.loadEventEnd / 1000
},
get firstPaintTime() {
const fpEntry = performance.getEntriesByType('paint')[0] || {
startTime: timing.loadEventEnd / 1000 // Fallback if no navigation occured (`about:blank`)
}
return toFixed(
(fpEntry.startTime + performance.timeOrigin) / 1000,
3
)
}
}
window.chrome.loadTimes = function () {
return {
...protocolInfo,
...timingInfo
}
}
utils.patchToString(window.chrome.loadTimes)
}
"""
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