Add HTTP Header speculation rules #170
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tunetheweb
commented
Jun 29, 2025
pmeenan
approved these changes
Jul 2, 2025
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pmeenan
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LGTM though wondering if it might be possible to pull the speculation rules fetch itself out of the $WPT_REQUESTS data.
pmeenan
approved these changes
Jul 2, 2025
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LGTM. If the Sec-FetchDest` request header is available, it might be more accurate to use that but I'm not sure if the header is available at custom-metrics time.
https://almanac.httparchive.org/en/2022/Changed custom metrics values: {
"_performance": {
"lcp_elem_stats": {
"startTime": 472,
"nodeName": "IMG",
"url": "https://almanac.httparchive.org/static/images/home-hero.png",
"size": 161505,
"loadTime": 342.40000000596046,
"renderTime": 472,
"attributes": [
{
"name": "src",
"value": "/static/images/home-hero.png"
},
{
"name": "alt",
"value": ""
},
{
"name": "width",
"value": "820"
},
{
"name": "height",
"value": "562"
},
{
"name": "fetchpriority",
"value": "high"
}
],
"boundingClientRect": {
"x": 866,
"y": 339.109375,
"width": 485,
"height": 332.390625,
"top": 339.109375,
"right": 1351,
"bottom": 671.5,
"left": 866
},
"naturalWidth": 820,
"naturalHeight": 562,
"styles": {
"background-image": "none",
"pointer-events": "auto",
"position": "relative",
"width": "485px",
"height": "332.391px"
},
"percentOfViewport": "0.173",
"cover90viewport": false
},
"raw_lcp_element": {
"nodeName": "IMG",
"attributes": [
{
"name": "src",
"value": "/static/images/home-hero.png"
},
{
"name": "alt",
"value": ""
},
{
"name": "width",
"value": "820"
},
{
"name": "height",
"value": "562"
},
{
"name": "fetchpriority",
"value": "high"
}
]
},
"lcp_resource": {
"id": "34933.10",
"sequence": 10,
"body": "/home/pmeenan/wptagent/work/wptagent-v6-manual-20241002-10.20.0.3/250702_5D_15.1.0/bodies/34933.10",
"url": "https://almanac.httparchive.org/static/images/home-hero.png",
"status": 200,
"connectionId": 125,
"protocol": "h2",
"connectionReused": true,
"fromServiceWorker": false,
"timing": {
"requestTime": 75948.01666,
"proxyStart": -1,
"proxyEnd": -1,
"dnsStart": -1,
"dnsEnd": -1,
"connectStart": -1,
"connectEnd": -1,
"sslStart": -1,
"sslEnd": -1,
"workerStart": -1,
"workerReady": -1,
"workerFetchStart": -1,
"workerRespondWithSettled": -1,
"sendStart": 6.032,
"sendEnd": 6.802,
"pushStart": 0,
"pushEnd": 0,
"receiveHeadersStart": 57.775,
"receiveHeadersEnd": 58.598
},
"fromDiskCache": false,
"remoteIPAddress": "[2607:f8b0:4004:c07::79]",
"remotePort": 443,
"securityState": "secure",
"securityDetails": {
"protocol": "TLS 1.3",
"keyExchange": "",
"keyExchangeGroup": "X25519",
"cipher": "AES_128_GCM",
"certificateId": 0,
"subjectName": "almanac.httparchive.org",
"sanList": [
"almanac.httparchive.org"
],
"issuer": "WR3",
"validFrom": 1747802989,
"validTo": 1755582041,
"signedCertificateTimestampList": [
{
"status": "Verified",
"origin": "Embedded in certificate",
"logDescription": "Let's Encrypt 'Oak2025h2'",
"logId": "0DE1F2302BD30DC140621209EA552EFC47747CB1D7E930EF0E421EB47E4EAA34",
"timestamp": 1747806589725,
"hashAlgorithm": "SHA-256",
"signatureAlgorithm": "ECDSA",
"signatureData": "3046022100F01F1EEC48A8367228365F844D9F436AD4DFCAD4DC3FDC6B90B00C7DD4A7F643022100CD560F6DAE12D3EC7E93275CE003A21CAB46C8CB876AF4BF58B3BDCBBC8C8F9C"
},
{
"status": "Verified",
"origin": "Embedded in certificate",
"logDescription": "Google 'Xenon2025h2' log",
"logId": "DDDCCA3495D7E11605E79532FAC79FF83D1C50DFDB003A1412760A2CACBBC82A",
"timestamp": 1747806589823,
"hashAlgorithm": "SHA-256",
"signatureAlgorithm": "ECDSA",
"signatureData": "304502200BF49F0A1D1AAAC58AAAF49F63516A4AFA6C54FBC0966BA7484D62865680B3E20221008D8FABB31E8E2A36B30ECE8F9A6E183274DFCBC628DF5D2D5935125BF5381026"
}
],
"certificateTransparencyCompliance": "compliant",
"serverSignatureAlgorithm": 2052,
"encryptedClientHello": false
},
"fromPrefetchCache": false,
"response_headers": {
"cache-control": "public, max-age=10800",
"content-type": "image/png",
"date": "Wed, 02 Jul 2025 18:20:36 GMT",
"etag": "\"EQi8WA\"",
"expires": "Wed, 02 Jul 2025 21:20:36 GMT",
"server": "Google Frontend",
"strict-transport-security": "max-age=31556926; includeSubDomains",
"vary": "Accept-Encoding",
"x-cloud-trace-context": "cc84f2923775dde6df036b3000f85c5c",
"x-content-type-options": "nosniff"
},
"request_headers": {
":authority": "almanac.httparchive.org",
":method": "GET",
":path": "/static/images/home-hero.png",
":scheme": "https",
"accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
"accept-encoding": "gzip, deflate, br, zstd",
"accept-language": "en-US,en;q=0.9",
"priority": "u=1, i",
"referer": "https://almanac.httparchive.org/en/2022/",
"sec-ch-ua": "\" Not A;Brand\";v=\"99\", \"Chromium\";v=\"138\", \"Google Chrome\";v=\"138\"",
"sec-ch-ua-mobile": "?0",
"sec-ch-ua-platform": "\"Unknown\"",
"sec-fetch-dest": "image",
"sec-fetch-mode": "no-cors",
"sec-fetch-site": "same-origin",
"user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36 PTST/250702.151337"
},
"initiator": {
"type": "parser",
"url": "https://almanac.httparchive.org/en/2022/",
"lineNumber": 1425,
"columnNumber": 99
},
"documentURL": "https://almanac.httparchive.org/en/2022/",
"timestamp": 75947.996856,
"frameId": "90D34EF390B181194D6CE71855E0618F",
"hasUserGesture": false,
"type": "Image",
"wallTime": 1751480436.809635,
"initialPriority": "High",
"priority": "High",
"transfer_size": 38208
},
"is_lcp_statically_discoverable": true,
"is_lcp_preloaded": false,
"lcp_preload": [],
"web_vitals_js": [
"https://almanac.httparchive.org/static/js/web-vitals.js?v=8d892f61f132b9a5889c5811203fa593"
],
"gaming_metrics": [],
"speculation_rules": {
"htmlRules": [
{
"prerender": [
{
"source": "document",
"where": {
"and": [
{
"href_matches": "/*"
},
{
"not": {
"href_matches": "/static/*"
}
}
]
},
"eagerness": "moderate"
}
]
}
],
"httpHeaderRules": []
}
}
}https://example.comChanged custom metrics values: {
"_performance": {
"lcp_elem_stats": {
"startTime": 408,
"nodeName": "P",
"url": "",
"size": 33858,
"loadTime": 0,
"renderTime": 408,
"attributes": [],
"boundingClientRect": {
"x": 383,
"y": 192.875,
"width": 600,
"height": 57,
"top": 192.875,
"right": 983,
"bottom": 249.875,
"left": 383
},
"styles": {
"background-image": "none",
"pointer-events": "auto",
"position": "static",
"width": "600px",
"height": "57px"
},
"percentOfViewport": "0.0368",
"cover90viewport": false
},
"raw_lcp_element": null,
"lcp_resource": null,
"is_lcp_statically_discoverable": true,
"is_lcp_preloaded": null,
"lcp_preload": null,
"web_vitals_js": [],
"gaming_metrics": [],
"speculation_rules": {
"htmlRules": [],
"httpHeaderRules": []
}
}
}https://blkandbold.comChanged custom metrics values: {
"_performance": {
"lcp_elem_stats": {
"startTime": 2024,
"nodeName": "IMG",
"url": "https://blkandbold.com/cdn/shop/files/web_BLK-_-Bold-Specialty-Coffee-_-Beverages_r1_bag-o-beans_82680.jpg?v=1724690124&width=832",
"size": 461227,
"loadTime": 1944.2999999970198,
"renderTime": 2024,
"attributes": [
{
"name": "src",
"value": "//blkandbold.com/cdn/shop/files/web_BLK-_-Bold-Specialty-Coffee-_-Beverages_r1_bag-o-beans_82680.jpg?v=1724690124&width=4000"
},
{
"name": "alt",
"value": ""
},
{
"name": "srcset",
"value": "//blkandbold.com/cdn/shop/files/web_BLK-_-Bold-Specialty-Coffee-_-Beverages_r1_bag-o-beans_82680.jpg?v=1724690124&width=352 352w, //blkandbold.com/cdn/shop/files/web_BLK-_-Bold-Specialty-Coffee-_-Beverages_r1_bag-o-beans_82680.jpg?v=1724690124&width=832 832w, //blkandbold.com/cdn/shop/files/web_BLK-_-Bold-Specialty-Coffee-_-Beverages_r1_bag-o-beans_82680.jpg?v=1724690124&width=1200 1200w, //blkandbold.com/cdn/shop/files/web_BLK-_-Bold-Specialty-Coffee-_-Beverages_r1_bag-o-beans_82680.jpg?v=1724690124&width=1920 1920w, //blkandbold.com/cdn/shop/files/web_BLK-_-Bold-Specialty-Coffee-_-Beverages_r1_bag-o-beans_82680.jpg?v=1724690124&width=4000 4000w"
},
{
"name": "width",
"value": "4000"
},
{
"name": "height",
"value": "4000.0"
},
{
"name": "loading",
"value": "eager"
},
{
"name": "class",
"value": "hero__image hero__image--slide_FrcefU image-element"
},
{
"name": "sizes",
"value": "\n\n(min-width: 769px) 60vw, 100vw"
},
{
"name": "data-animate",
"value": "fadein"
}
],
"boundingClientRect": {
"x": 540.390625,
"y": 112,
"width": 810.59375,
"height": 700,
"top": 112,
"right": 1350.984375,
"bottom": 812,
"left": 540.390625
},
"naturalWidth": 819,
"naturalHeight": 819,
"styles": {
"background-image": "none",
"pointer-events": "auto",
"position": "relative",
"width": "810.594px",
"height": "700px"
},
"percentOfViewport": "0.496",
"cover90viewport": false
},
"raw_lcp_element": {
"nodeName": "IMG",
"attributes": [
{
"name": "src",
"value": "//blkandbold.com/cdn/shop/files/web_BLK-_-Bold-Specialty-Coffee-_-Beverages_r1_bag-o-beans_82680.jpg?v=1724690124&width=4000"
},
{
"name": "alt",
"value": ""
},
{
"name": "srcset",
"value": "//blkandbold.com/cdn/shop/files/web_BLK-_-Bold-Specialty-Coffee-_-Beverages_r1_bag-o-beans_82680.jpg?v=1724690124&width=352 352w, //blkandbold.com/cdn/shop/files/web_BLK-_-Bold-Specialty-Coffee-_-Beverages_r1_bag-o-beans_82680.jpg?v=1724690124&width=832 832w, //blkandbold.com/cdn/shop/files/web_BLK-_-Bold-Specialty-Coffee-_-Beverages_r1_bag-o-beans_82680.jpg?v=1724690124&width=1200 1200w, //blkandbold.com/cdn/shop/files/web_BLK-_-Bold-Specialty-Coffee-_-Beverages_r1_bag-o-beans_82680.jpg?v=1724690124&width=1920 1920w, //blkandbold.com/cdn/shop/files/web_BLK-_-Bold-Specialty-Coffee-_-Beverages_r1_bag-o-beans_82680.jpg?v=1724690124&width=4000 4000w"
},
{
"name": "width",
"value": "4000"
},
{
"name": "height",
"value": "4000.0"
},
{
"name": "loading",
"value": "eager"
},
{
"name": "class",
"value": "hero__image hero__image--slide_FrcefU\n image-element"
},
{
"name": "sizes",
"value": "\n\n(min-width: 769px) 60vw, 100vw"
},
{
"name": "data-animate",
"value": "fadein"
}
]
},
"lcp_resource": {
"id": "36267.23",
"sequence": 19,
"body": "/home/pmeenan/wptagent/work/wptagent-v6-manual-20241002-10.20.0.3/250702_B8_17.1.0/bodies/36267.23",
"url": "https://blkandbold.com/cdn/shop/files/web_BLK-_-Bold-Specialty-Coffee-_-Beverages_r1_bag-o-beans_82680.jpg?v=1724690124&width=832",
"status": 200,
"connectionId": 131,
"protocol": "h2",
"connectionReused": true,
"fromServiceWorker": false,
"timing": {
"requestTime": 76018.303185,
"proxyStart": -1,
"proxyEnd": -1,
"dnsStart": -1,
"dnsEnd": -1,
"connectStart": -1,
"connectEnd": -1,
"sslStart": -1,
"sslEnd": -1,
"workerStart": -1,
"workerReady": -1,
"workerFetchStart": -1,
"workerRespondWithSettled": -1,
"sendStart": 0.672,
"sendEnd": 1.987,
"pushStart": 0,
"pushEnd": 0,
"receiveHeadersStart": 82.053,
"receiveHeadersEnd": 82.445
},
"fromDiskCache": false,
"remoteIPAddress": "23.227.38.32",
"remotePort": 443,
"securityState": "secure",
"securityDetails": {
"protocol": "TLS 1.3",
"keyExchange": "",
"keyExchangeGroup": "X25519MLKEM768",
"cipher": "AES_128_GCM",
"certificateId": 0,
"subjectName": "blkandbold.com",
"sanList": [
"blkandbold.com"
],
"issuer": "WE1",
"validFrom": 1748300790,
"validTo": 1756080379,
"signedCertificateTimestampList": [
{
"status": "Verified",
"origin": "Embedded in certificate",
"logDescription": "Cloudflare 'Nimbus2025'",
"logId": "CCFB0F6A85710965FE959B53CEE9B27C22E9855C0D978DB6A97E54C0FE4C0DB0",
"timestamp": 1748304391594,
"hashAlgorithm": "SHA-256",
"signatureAlgorithm": "ECDSA",
"signatureData": "30450220107F46F630D718891071676D1883A4A797E3A726852518705CB4579BC60335DE022100D5463D701E7E33403CDBB0192F9B428F4131667E0498D61F9DFF0BE0FECEEAE1"
},
{
"status": "Verified",
"origin": "Embedded in certificate",
"logDescription": "Google 'Argon2025h2' log",
"logId": "12F14E34BD53724C840619C38F3F7A13F8E7B56287889C6D300584EBE586263A",
"timestamp": 1748304391532,
"hashAlgorithm": "SHA-256",
"signatureAlgorithm": "ECDSA",
"signatureData": "3045022100CB3DB6545683B6D88DE4550EADF6B6624B0D3EE2A08A944BE003C1C73918FC290220509621BD4D563A5D74ABB410ED7435466D7C43C7823743764ABA6F7858B8933C"
}
],
"certificateTransparencyCompliance": "compliant",
"serverSignatureAlgorithm": 1027,
"encryptedClientHello": false
},
"fromPrefetchCache": false,
"response_headers": {
"accept-ranges": "bytes",
"access-control-allow-origin": "*",
"access-control-expose-headers": "*",
"age": "4689037",
"alt-svc": "h3=\":443\"; ma=86400",
"cache-control": "public, max-age=31557600",
"cf-cache-status": "HIT",
"cf-ray": "95902a319e783ec9-IAD",
"content-length": "42270",
"content-security-policy": "sandbox allow-scripts allow-forms allow-modals allow-popups allow-downloads allow-top-navigation-by-user-activation",
"content-type": "image/webp",
"date": "Wed, 02 Jul 2025 18:21:47 GMT",
"last-modified": "Thu, 21 Nov 2024 11:46:29 GMT",
"nel": "{\"success_fraction\":0.01,\"report_to\":\"cf-nel\",\"max_age\":604800}",
"report-to": "{\"endpoints\":[{\"url\":\"https:\\/\\/a.nel.cloudflare.com\\/report\\/v4?s=YH9jd6%2BP1qQePE4ggStvb8HlCNuR5pUIQIiZ%2BkmJsELqaYiZvpjxeiMWqVYRFD5mcAGV%2B6iTqd5j%2FDtON1K43Q5qyV8jz50rVxMQP8ysAqg12FLrNTEKQUCO0AGd8IN7\"}],\"group\":\"cf-nel\",\"max_age\":604800}",
"server": "cloudflare",
"server-timing": "imagery;dur=205.818, imageryFetch;dur=48.326, imageryProcess;dur=157.017;desc=\"image\"\ncfRequestDuration;dur=30.999899",
"shopify-edge-ip": "23.227.38.32",
"source-length": "249183",
"source-type": "image/jpeg",
"strict-transport-security": "max-age=63072000; includeSubDomains; preload",
"timing-allow-origin": "*",
"vary": "Accept, Accept-Encoding",
"x-content-type-options": "nosniff",
"x-dc": "gcp-us-east1,gcp-us-central1",
"x-download-options": "noopen",
"x-permitted-cross-domain-policies": "none",
"x-request-id": "4ad272ea-ea07-470e-aa0a-568cb4fa040d-1732189589",
"x-shopid": "2322235445",
"x-sorting-hat-podid": "197",
"x-sorting-hat-shopid": "2322235445",
"x-xss-protection": "1; mode=block"
},
"request_headers": {
":authority": "blkandbold.com",
":method": "GET",
":path": "/cdn/shop/files/web_BLK-_-Bold-Specialty-Coffee-_-Beverages_r1_bag-o-beans_82680.jpg?v=1724690124&width=832",
":scheme": "https",
"accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
"accept-encoding": "gzip, deflate, br, zstd",
"accept-language": "en-US,en;q=0.9",
"cookie": "keep_alive=e5262082-cc95-4445-b184-a58325f52b4b; localization=US; cart_currency=USD; _shopify_y=3e544e3d-fe03-4090-a682-e8414233398d; _shopify_s=4afa0443-6113-4754-a60a-84272baa11f3; _tracking_consent=3.AMPS_USDC_f_f_yRLHTtLZRK23f9ulXpcRfA; _orig_referrer=; _landing_page=%2F",
"priority": "u=2, i",
"referer": "https://blkandbold.com/",
"sec-ch-ua": "\" Not A;Brand\";v=\"99\", \"Chromium\";v=\"138\", \"Google Chrome\";v=\"138\"",
"sec-ch-ua-mobile": "?0",
"sec-ch-ua-platform": "\"Unknown\"",
"sec-fetch-dest": "image",
"sec-fetch-mode": "no-cors",
"sec-fetch-site": "same-origin",
"user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36 PTST/250702.151337"
},
"initiator": {
"type": "parser",
"url": "https://blkandbold.com/",
"lineNumber": 3645,
"columnNumber": 54
},
"documentURL": "https://blkandbold.com/",
"timestamp": 76018.301982,
"frameId": "B5913EEAED4E1D7C3235C4E788B13D65",
"hasUserGesture": false,
"type": "Image",
"wallTime": 1751480507.114786,
"initialPriority": "Medium",
"priority": "Medium",
"transfer_size": 42825
},
"is_lcp_statically_discoverable": true,
"is_lcp_preloaded": false,
"lcp_preload": [],
"web_vitals_js": [
"https://blkandbold.com/cdn/shopifycloud/perf-kit/shopify-perf-kit-1.6.6.min.js",
"https://cdn.shopify.com/shopifycloud/checkout-web/assets/c1.en/app.rndyD_a3.js"
],
"gaming_metrics": {
"fidIframeOverlaySoft": true
},
"speculation_rules": {
"htmlRules": [],
"httpHeaderRules": [
{
"url": "https://blkandbold.com/cdn/shopifycloud/shopify/assets/storefront/storefronts.specrules-828df0376f942523726504d6cb4fbacd41a1db514689a84555c7d42872ee5363.json",
"rule": {
"tag": "shopify_storefront",
"prefetch": [
{
"where": {
"or": [
{
"href_matches": "/(products|collections|pages|search|shop|blogs|policies){/*}?"
},
{
"href_matches": "/([a-z]{2,3}|zh-hans|zh-hant)(-[a-z]{2,3})?/(products|collections|pages|search|shop|blogs|policies){/*}?"
},
{
"href_matches": "/"
},
{
"href_matches": "/([a-z]{2,3}|zh-hans|zh-hant)(-[a-z]{2,3})?{/}?"
}
]
},
"eagerness": "conservative"
}
]
}
}
]
}
}
}https://www.hillhousehome.comChanged custom metrics values: {
"_performance": {
"lcp_elem_stats": {
"startTime": 6428,
"nodeName": "IMG",
"url": "https://www.hillhousehome.com/cdn/shop/files/desktop-event-homepagehero-sweetpeas_1440x720.png?v=1751373140",
"size": 433671,
"loadTime": 6227.9000000059605,
"renderTime": 6428,
"attributes": [
{
"name": "class",
"value": "inlineImg desktop lazyautosizes lazyloaded"
},
{
"name": "src",
"value": "//www.hillhousehome.com/cdn/shop/files/desktop-event-homepagehero-sweetpeas_32x16.png?v=1751373140"
},
{
"name": "style",
"value": "\n --focal-x: 50.0%;\n --focal-y: 50.0%;\n \n "
},
{
"name": "data-widths",
"value": "[540, 720, 900, 1080, 1250, 1440, 1680, 1920]"
},
{
"name": "data-aspectratio",
"value": "2.0"
},
{
"name": "data-sizes",
"value": "auto"
},
{
"name": "alt",
"value": ""
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} |
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Resolves #111
Fetches HTTP header Speculation Rules and stores them in the
performancecustom metric.Test websites: