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core(network-analyzer): include 0 start times in rtt estimate #15100
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These seem like good assumptions, but can you capture a netlog of one of these cases so we can resolve some of these questions? Ideally future investigations of RTT estimating can terminate here rather than continuing up blame. |
Here's a netlog and dt log of cnet.com https://gist.github.com/connorjclark/3b85c1e06667beed53fb0ef27123c987 url Search for Every request to that domain: {"method":"Network.requestWillBeSent","params":{"requestId":"31581.102","loaderId":"4A72DC93BD5B2F1FC2732BD4C4E1A232","documentURL":"https://www.cnet.com/","request":{"url":"https://pixel.tapad.com/idsync/ex/receive?partner_id=3185&partner_device_id=AU1D-0100-001684779540-S135AXKT-AZHU&partner_url=https://ids.ad.gt%2Fapi%2Fv1%2Ftapad_match%3Fid%3DAU1D-0100-001684779540-S135AXKT-AZHU%26tapad_id%3D%24%7BTA_DEVICE_ID%7D","method":"GET","headers":{"sec-ch-ua":"\"Chromium\";v=\"109\", \"Google Chrome\";v=\"109\", \"Lighthouse\";v=\"10.2.0\"","Referer":"https://www.cnet.com/","sec-ch-ua-mobile":"?1","User-Agent":"Mozilla/5.0 (Linux; Android 11; moto g power (2022)) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Mobile Safari/537.36","sec-ch-ua-platform":"\"Android\""},"mixedContentType":"none","initialPriority":"Low","referrerPolicy":"no-referrer-when-downgrade","isSameSite":false},"timestamp":53867.332187,"wallTime":1684779539.878556,"initiator":{"type":"script","stack":{"callFrames":[],"parent":{"description":"Image","callFrames":[{"functionName":"imgSrcToElement","scriptId":"66","url":"https://a.ad.gt/api/v1/u/matches/489?url=https%3A%2F%2Fwww.cnet.com%2F&ref=","lineNumber":36,"columnNumber":16},{"functionName":"setupCookieSync","scriptId":"66","url":"https://a.ad.gt/api/v1/u/matches/489?url=https%3A%2F%2Fwww.cnet.com%2F&ref=","lineNumber":139,"columnNumber":28},{"functionName":"processData","scriptId":"66","url":"https://a.ad.gt/api/v1/u/matches/489?url=https%3A%2F%2Fwww.cnet.com%2F&ref=","lineNumber":191,"columnNumber":8},{"functionName":"onConsent","scriptId":"66","url":"https://a.ad.gt/api/v1/u/matches/489?url=https%3A%2F%2Fwww.cnet.com%2F&ref=","lineNumber":229,"columnNumber":12},{"functionName":"","scriptId":"66","url":"https://a.ad.gt/api/v1/u/matches/489?url=https%3A%2F%2Fwww.cnet.com%2F&ref=","lineNumber":241,"columnNumber":4},{"functionName":"","scriptId":"66","url":"https://a.ad.gt/api/v1/u/matches/489?url=https%3A%2F%2Fwww.cnet.com%2F&ref=","lineNumber":243,"columnNumber":1}]}}},"redirectHasExtraInfo":false,"type":"Image","frameId":"02FC76DD83EC140C804E9EBB0F2F7C62","hasUserGesture":false},"targetType":"page","sessionId":"EBFE6CF6852CFE9E269254DD9B5E0C34"},
{"method":"Network.requestWillBeSent","params":{"requestId":"31581.102","loaderId":"4A72DC93BD5B2F1FC2732BD4C4E1A232","documentURL":"https://www.cnet.com/","request":{"url":"https://pixel.tapad.com/idsync/ex/receive/check?partner_id=3185&partner_device_id=AU1D-0100-001684779540-S135AXKT-AZHU&partner_url=https://ids.ad.gt%2Fapi%2Fv1%2Ftapad_match%3Fid%3DAU1D-0100-001684779540-S135AXKT-AZHU%26tapad_id%3D%24%7BTA_DEVICE_ID%7D","method":"GET","headers":{"Referer":"https://www.cnet.com/","User-Agent":"Mozilla/5.0 (Linux; Android 11; moto g power (2022)) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Mobile Safari/537.36"},"mixedContentType":"none","initialPriority":"Low","referrerPolicy":"no-referrer-when-downgrade","isSameSite":false},"timestamp":53867.573105,"wallTime":1684779540.119505,"initiator":{"type":"parser","url":"https://www.cnet.com/","lineNumber":707,"columnNumber":1},"redirectHasExtraInfo":true,"redirectResponse":{"url":"https://pixel.tapad.com/idsync/ex/receive?partner_id=3185&partner_device_id=AU1D-0100-001684779540-S135AXKT-AZHU&partner_url=https://ids.ad.gt%2Fapi%2Fv1%2Ftapad_match%3Fid%3DAU1D-0100-001684779540-S135AXKT-AZHU%26tapad_id%3D%24%7BTA_DEVICE_ID%7D","status":302,"statusText":"","headers":{"date":"Mon, 22 May 2023 18:18:59 GMT","strict-transport-security":"max-age=31536000","via":"1.1 google","accept-ch":"Sec-CH-UA, Sec-CH-UA-Arch, Sec-CH-UA-Bitness, Sec-CH-UA-Full-Version-List, Sec-CH-UA-Mobile, Sec-CH-UA-Model, Sec-CH-UA-Platform, Sec-CH-UA-Platform-Version, Sec-CH-UA-WoW64","p3p":"policyref=\"http://tapad-taptags.s3.amazonaws.com/policy/p3p.xml\", CP=\"NOI DSP COR ADM PSAo PSDo OURo SAMo UNRo OTRo BUS COM NAV DEM STA PRE\"","access-control-allow-origin":"*","location":"https://pixel.tapad.com/idsync/ex/receive/check?partner_id=3185&partner_device_id=AU1D-0100-001684779540-S135AXKT-AZHU&partner_url=https://ids.ad.gt%2Fapi%2Fv1%2Ftapad_match%3Fid%3DAU1D-0100-001684779540-S135AXKT-AZHU%26tapad_id%3D%24%7BTA_DEVICE_ID%7D","alt-svc":"h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000","content-length":"0"},"mimeType":"","connectionReused":false,"connectionId":483,"remoteIPAddress":"[64:ff9b::226f:713e]","remotePort":443,"fromDiskCache":false,"fromServiceWorker":false,"fromPrefetchCache":false,"encodedDataLength":746,"timing":{"requestTime":53867.332605,"proxyStart":-1,"proxyEnd":-1,"dnsStart":0.656,"dnsEnd":69.37,"connectStart":69.37,"connectEnd":81.895,"sslStart":73.217,"sslEnd":81.892,"workerStart":-1,"workerReady":-1,"workerFetchStart":-1,"workerRespondWithSettled":-1,"sendStart":82.128,"sendEnd":82.319,"pushStart":0,"pushEnd":0,"receiveHeadersEnd":99.906},"responseTime":1684779539978.809,"protocol":"h2","alternateProtocolUsage":"unspecifiedReason","securityState":"secure","securityDetails":{"protocol":"TLS 1.3","keyExchange":"","keyExchangeGroup":"X25519","cipher":"AES_128_GCM","certificateId":0,"subjectName":"*.tapad.com","sanList":["*.tapad.com","tapad.com"],"issuer":"DigiCert TLS RSA SHA256 2020 CA1","validFrom":1663113600,"validTo":1697414399,"signedCertificateTimestampList":[{"status":"Verified","origin":"Embedded in certificate","logDescription":"Google 'Xenon2023' log","logId":"ADF7BEFA7CFF10C88B9D3D9C1E3E186AB467295DCFB10C24CA858634EBDC828A","timestamp":1663169386417,"hashAlgorithm":"SHA-256","signatureAlgorithm":"ECDSA","signatureData":"3045022100FB08E42417D8338773E25C305223235FD6D30C090D39193141AF7C386CD583DF02202C642BE189F7DE353083B9BCD98F3DF7014EB803DF269BE23351AC18F228E803"},{"status":"Verified","origin":"Embedded in certificate","logDescription":"DigiCert Yeti2023 Log","logId":"35CF191BBFB16C57BF0FAD4C6D42CBBBB627202651EA3FE12AEFA803C33BD64C","timestamp":1663169386384,"hashAlgorithm":"SHA-256","signatureAlgorithm":"ECDSA","signatureData":"304502203645CF77700753CFC811C9C02959A866FF3B4F347555E2252F7842267BB6836C022100B619133AFBFB3E950A39322BD3CFECC4E4ABA24B354D1DFE3FBA3F8F2F3723A3"},{"status":"Verified","origin":"Embedded in certificate","logDescription":"DigiCert Nessie2023 Log","logId":"B3737707E18450F86386D605A9DC11094A792DB1670C0B87DCF0030E7936A59A","timestamp":1663169386468,"hashAlgorithm":"SHA-256","signatureAlgorithm":"ECDSA","signatureData":"304402200782624FF146560CCFF5D48530A4B5766945F006222D21E487D962026A3C435602207F1739B4AEF854666E69B294619485DD94CDF012C6253F4F955ECCE3A6AE8669"}],"certificateTransparencyCompliance":"compliant","serverSignatureAlgorithm":2052,"encryptedClientHello":false}},"type":"Image","frameId":"02FC76DD83EC140C804E9EBB0F2F7C62","hasUserGesture":false},"targetType":"page","sessionId":"EBFE6CF6852CFE9E269254DD9B5E0C34"},
{"method":"Network.requestWillBeSent","params":{"requestId":"31581.102","loaderId":"4A72DC93BD5B2F1FC2732BD4C4E1A232","documentURL":"https://www.cnet.com/","request":{"url":"https://pixel.tapad.com/idsync/ex/receive?partner_id=1830&partner_device_id=362f40e3-c382-44f2-879f-5faa847c7d0c&ttd_puid=c0b0432c-64e8-4f10-b286-5ed2d7f9ec9d%2Chttps%253A%252F%252Fids.ad.gt%252Fapi%252Fv1%252Ftapad_match%253Fid%253DAU1D-0100-001684779540-S135AXKT-AZHU%2526tapad_id%253Dc0b0432c-64e8-4f10-b286-5ed2d7f9ec9d%2C","method":"GET","headers":{"Referer":"https://www.cnet.com/","User-Agent":"Mozilla/5.0 (Linux; Android 11; moto g power (2022)) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Mobile Safari/537.36"},"mixedContentType":"none","initialPriority":"Low","referrerPolicy":"no-referrer-when-downgrade","isSameSite":false},"timestamp":53867.663725,"wallTime":1684779540.210102,"initiator":{"type":"parser","url":"https://www.cnet.com/","lineNumber":707,"columnNumber":1},"redirectHasExtraInfo":true,"redirectResponse":{"url":"https://match.adsrvr.org/track/cmf/generic?ttd_pid=tapad&ttd_tpi=1&ttd_puid=c0b0432c-64e8-4f10-b286-5ed2d7f9ec9d%252Chttps%25253A%25252F%25252Fids.ad.gt%25252Fapi%25252Fv1%25252Ftapad_match%25253Fid%25253DAU1D-0100-001684779540-S135AXKT-AZHU%252526tapad_id%25253Dc0b0432c-64e8-4f10-b286-5ed2d7f9ec9d%252C&gdpr=0&gdpr_consent=","status":302,"statusText":"","headers":{"pragma":"no-cache","date":"Mon, 22 May 2023 18:19:00 GMT","x-aspnet-version":"4.0.30319","p3p":"CP=\"NOI DSP COR CUR ADMo DEVo PSAo PSDo OUR SAMo BUS UNI NAV\"","location":"https://pixel.tapad.com/idsync/ex/receive?partner_id=1830&partner_device_id=362f40e3-c382-44f2-879f-5faa847c7d0c&ttd_puid=c0b0432c-64e8-4f10-b286-5ed2d7f9ec9d%2Chttps%253A%252F%252Fids.ad.gt%252Fapi%252Fv1%252Ftapad_match%253Fid%253DAU1D-0100-001684779540-S135AXKT-AZHU%2526tapad_id%253Dc0b0432c-64e8-4f10-b286-5ed2d7f9ec9d%2C","content-type":"text/html","cache-control":"private,no-cache, must-revalidate","content-length":"683"},"mimeType":"text/html","connectionReused":true,"connectionId":449,"remoteIPAddress":"[64:ff9b::321:dc96]","remotePort":443,"fromDiskCache":false,"fromServiceWorker":false,"fromPrefetchCache":false,"encodedDataLength":666,"timing":{"requestTime":53867.616118,"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":0.066,"sendEnd":0.138,"pushStart":0,"pushEnd":0,"receiveHeadersEnd":16.837},"responseTime":1684779540179.285,"protocol":"h2","alternateProtocolUsage":"unspecifiedReason","securityState":"unknown"},"type":"Image","frameId":"02FC76DD83EC140C804E9EBB0F2F7C62","hasUserGesture":false},"targetType":"page","sessionId":"EBFE6CF6852CFE9E269254DD9B5E0C34"},
{"method":"Network.requestWillBeSent","params":{"requestId":"31617.5","loaderId":"992D8E27784816C26018FA580863BCBB","documentURL":"https://ads.pubmatic.com/AdServer/js/user_sync.html?p=156011&s=165626&predirect=https%3A%2F%2Fs.amazon-adsystem.com%2Fecm3%3Fex%3Dpubmatic.com%26id%3DPM_UID","request":{"url":"https://pixel.tapad.com/idsync/ex/receive?partner_id=3371&partner_device_id=1C562A87-F750-40CF-83DA-DC36B0667471","method":"GET","headers":{"sec-ch-ua":"\"Not/A)Brand\";v=\"99\", \"Google Chrome\";v=\"115\", \"Chromium\";v=\"115\"","Referer":"https://ads.pubmatic.com/","sec-ch-ua-mobile":"?0","User-Agent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36","sec-ch-ua-platform":"\"macOS\""},"mixedContentType":"none","initialPriority":"Low","referrerPolicy":"strict-origin-when-cross-origin","isSameSite":false},"timestamp":53869.543484,"wallTime":1684779542.089862,"initiator":{"type":"parser","url":"https://ads.pubmatic.com/AdServer/js/user_sync.html?p=156011&s=165626&predirect=https%3A%2F%2Fs.amazon-adsystem.com%2Fecm3%3Fex%3Dpubmatic.com%26id%3DPM_UID","lineNumber":0,"columnNumber":15890},"redirectHasExtraInfo":false,"type":"Image","frameId":"7B149C4897D6722DFF7B9E848B694A50","hasUserGesture":false},"targetType":"iframe","sessionId":"3D0895F11BD1663D55A5F3DF5A99C8DD"},
{"method":"Network.requestWillBeSent","params":{"requestId":"31618.5","loaderId":"C5A76D5013D916EF1DE96D1149E74C43","documentURL":"https://sync-amz.ads.yieldmo.com/tamptsync?callback=https%3A%2F%2Fs.amazon-adsystem.com%2Fecm3%3Fex%3Dym.com%26id%3D%24UID","request":{"url":"https://pixel.tapad.com/idsync/ex/receive?partner_id=3107&partner_device_id=gfd4bd30b45943908ca9","method":"GET","headers":{"sec-ch-ua":"\"Not/A)Brand\";v=\"99\", \"Google Chrome\";v=\"115\", \"Chromium\";v=\"115\"","Referer":"https://sync-amz.ads.yieldmo.com/","sec-ch-ua-mobile":"?0","User-Agent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36","sec-ch-ua-platform":"\"macOS\""},"mixedContentType":"none","initialPriority":"Low","referrerPolicy":"strict-origin-when-cross-origin","isSameSite":false},"timestamp":53869.556407,"wallTime":1684779542.102779,"initiator":{"type":"parser","url":"https://sync-amz.ads.yieldmo.com/tamptsync?callback=https%3A%2F%2Fs.amazon-adsystem.com%2Fecm3%3Fex%3Dym.com%26id%3D%24UID","lineNumber":6,"columnNumber":163},"redirectHasExtraInfo":false,"type":"Image","frameId":"3F5A1E0C720654664FC8DE7039EF2F25","hasUserGesture":false},"targetType":"iframe","sessionId":"76679A420B360B40D49E18C01CCDC240"},
{"method":"Network.requestWillBeSent","params":{"requestId":"31617.5","loaderId":"992D8E27784816C26018FA580863BCBB","documentURL":"https://ads.pubmatic.com/AdServer/js/user_sync.html?p=156011&s=165626&predirect=https%3A%2F%2Fs.amazon-adsystem.com%2Fecm3%3Fex%3Dpubmatic.com%26id%3DPM_UID","request":{"url":"https://pixel.tapad.com/idsync/ex/receive?partner_id=APPNEXUS&partner_device_id=1400146762626694345&pt=c0b0432c-64e8-4f10-b286-5ed2d7f9ec9d%2C%2C","method":"GET","headers":{"Referer":"https://ads.pubmatic.com/","User-Agent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36"},"mixedContentType":"none","initialPriority":"Low","referrerPolicy":"strict-origin-when-cross-origin","isSameSite":false},"timestamp":53869.767585,"wallTime":1684779542.313966,"initiator":{"type":"parser","url":"https://ads.pubmatic.com/AdServer/js/user_sync.html?p=156011&s=165626&predirect=https%3A%2F%2Fs.amazon-adsystem.com%2Fecm3%3Fex%3Dpubmatic.com%26id%3DPM_UID","lineNumber":0,"columnNumber":15890},"redirectHasExtraInfo":true,"redirectResponse":{"url":"https://secure.adnxs.com/getuid?https%3A%2F%2Fpixel.tapad.com%2Fidsync%2Fex%2Freceive%3Fpartner_id%3DAPPNEXUS%26partner_device_id%3D%24UID%26pt%3Dc0b0432c-64e8-4f10-b286-5ed2d7f9ec9d%252C%252C","status":302,"statusText":"Found","headers":{"Date":"Mon, 22 May 2023 18:19:02 GMT","P3P":"policyref=\"http://cdn.adnxs-simple.com/w3c/policy/p3p.xml\", CP=\"NOI DSP COR ADM PSAo PSDo OURo SAMo UNRo OTRo BUS COM NAV DEM STA PRE\"","Connection":"keep-alive","X-Proxy-Origin":"104.132.154.88; 104.132.154.88; 585.bm-nginx-loadbalancer.mgmt.nym2.adnexus.net; adnxs.com","Content-Length":"0","X-XSS-Protection":"0","Pragma":"no-cache","AN-X-Request-Uuid":"1e9a9a5e-112b-47c0-b0ea-2a65002bcff3","Server":"nginx/1.21.3","Accept-CH":"Sec-CH-UA-Full-Version-List,Sec-CH-UA-Arch,Sec-CH-UA-Model,Sec-CH-UA-Platform-Version,Sec-CH-UA-Bitness","Content-Type":"text/html; charset=utf-8","Access-Control-Allow-Origin":"*","Location":"https://pixel.tapad.com/idsync/ex/receive?partner_id=APPNEXUS&partner_device_id=1400146762626694345&pt=c0b0432c-64e8-4f10-b286-5ed2d7f9ec9d%2C%2C","Cache-Control":"no-store, no-cache, private","Access-Control-Allow-Credentials":"true","Expires":"Sat, 15 Nov 2008 16:00:00 GMT"},"mimeType":"text/html","connectionReused":true,"connectionId":1963,"remoteIPAddress":"[64:ff9b::4443:b357]","remotePort":443,"fromDiskCache":false,"fromServiceWorker":false,"fromPrefetchCache":false,"encodedDataLength":1093,"timing":{"requestTime":53869.692933,"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":6.727,"sendEnd":6.75,"pushStart":0,"pushEnd":0,"receiveHeadersEnd":74.413},"responseTime":1684779542313.684,"protocol":"http/1.1","alternateProtocolUsage":"unspecifiedReason","securityState":"unknown"},"type":"Image","frameId":"7B149C4897D6722DFF7B9E848B694A50","hasUserGesture":false},"targetType":"iframe","sessionId":"3D0895F11BD1663D55A5F3DF5A99C8DD"},
{"method":"Network.requestWillBeSent","params":{"requestId":"31618.5","loaderId":"C5A76D5013D916EF1DE96D1149E74C43","documentURL":"https://sync-amz.ads.yieldmo.com/tamptsync?callback=https%3A%2F%2Fs.amazon-adsystem.com%2Fecm3%3Fex%3Dym.com%26id%3D%24UID","request":{"url":"https://pixel.tapad.com/idsync/ex/receive?partner_id=APPNEXUS&partner_device_id=1400146762626694345&pt=c0b0432c-64e8-4f10-b286-5ed2d7f9ec9d%2C%2C","method":"GET","headers":{"Referer":"https://sync-amz.ads.yieldmo.com/","User-Agent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36"},"mixedContentType":"none","initialPriority":"Low","referrerPolicy":"strict-origin-when-cross-origin","isSameSite":false},"timestamp":53869.799662,"wallTime":1684779542.346048,"initiator":{"type":"parser","url":"https://sync-amz.ads.yieldmo.com/tamptsync?callback=https%3A%2F%2Fs.amazon-adsystem.com%2Fecm3%3Fex%3Dym.com%26id%3D%24UID","lineNumber":6,"columnNumber":163},"redirectHasExtraInfo":true,"redirectResponse":{"url":"https://secure.adnxs.com/getuid?https%3A%2F%2Fpixel.tapad.com%2Fidsync%2Fex%2Freceive%3Fpartner_id%3DAPPNEXUS%26partner_device_id%3D%24UID%26pt%3Dc0b0432c-64e8-4f10-b286-5ed2d7f9ec9d%252C%252C","status":302,"statusText":"Found","headers":{"Date":"Mon, 22 May 2023 18:19:02 GMT","P3P":"policyref=\"http://cdn.adnxs-simple.com/w3c/policy/p3p.xml\", CP=\"NOI DSP COR ADM PSAo PSDo OURo SAMo UNRo OTRo BUS COM NAV DEM STA PRE\"","Connection":"keep-alive","X-Proxy-Origin":"104.132.154.88; 104.132.154.88; 585.bm-nginx-loadbalancer.mgmt.nym2.adnexus.net; adnxs.com","Content-Length":"0","X-XSS-Protection":"0","Pragma":"no-cache","AN-X-Request-Uuid":"f9f47ea0-8274-4ece-9b18-1174b753a559","Server":"nginx/1.21.3","Accept-CH":"Sec-CH-UA-Full-Version-List,Sec-CH-UA-Arch,Sec-CH-UA-Model,Sec-CH-UA-Platform-Version,Sec-CH-UA-Bitness","Content-Type":"text/html; charset=utf-8","Access-Control-Allow-Origin":"*","Location":"https://pixel.tapad.com/idsync/ex/receive?partner_id=APPNEXUS&partner_device_id=1400146762626694345&pt=c0b0432c-64e8-4f10-b286-5ed2d7f9ec9d%2C%2C","Cache-Control":"no-store, no-cache, private","Access-Control-Allow-Credentials":"true","Expires":"Sat, 15 Nov 2008 16:00:00 GMT"},"mimeType":"text/html","connectionReused":false,"connectionId":2319,"remoteIPAddress":"[64:ff9b::4443:b357]","remotePort":443,"fromDiskCache":false,"fromServiceWorker":false,"fromPrefetchCache":false,"encodedDataLength":1093,"timing":{"requestTime":53869.693054,"proxyStart":-1,"proxyEnd":-1,"dnsStart":0,"dnsEnd":0,"connectStart":0,"connectEnd":18.122,"sslStart":0,"sslEnd":18.119,"workerStart":-1,"workerReady":-1,"workerFetchStart":-1,"workerRespondWithSettled":-1,"sendStart":35.91,"sendEnd":35.987,"pushStart":0,"pushEnd":0,"receiveHeadersEnd":106.337},"responseTime":1684779542345.724,"protocol":"http/1.1","alternateProtocolUsage":"unspecifiedReason","securityState":"unknown"},"type":"Image","frameId":"3F5A1E0C720654664FC8DE7039EF2F25","hasUserGesture":false},"targetType":"iframe","sessionId":"76679A420B360B40D49E18C01CCDC240"}, |
I thought it could be related to subframes opening a connection before the top frame makes its first request to the same origin. And it could play a part. But I can't get a consistent connect start of 0 (just very close). There must be too much out of our control, this can just happen rarely. My test fixture: <!DOCTYPE html>
<html>
<head>
<link rel='dns-prefetch' href='https://fonts.gstatic.com' crossorigin />
<link rel='preconnect' href='https://fonts.gstatic.com' crossorigin />
<style>
div {
font-family: 'Droid Sans';
}
</style>
</head>
<body>
<div>preconnect</div>
<script>
let timeout = 0;
if (document.location.search !== '?noframe') {
const el = document.createElement('iframe');
el.src = '?noframe';
document.body.append(el);
timeout = 10 * 1000;
}
setTimeout(() => {
const el = document.createElement('link');
el.href = 'https://fonts.googleapis.com/css?family=PT+Serif:regular,italic,bold|PT+Sans:regular,italic,bold|Droid+Sans:400,700|Lato:700,900';
el.rel = 'stylesheet';
document.head.append(el);
const el2 = document.createElement('script');
el2.src = './hello.js?redirect=./hello.js';
document.head.append(el2);
}, timeout);
</script>
</body>
</html> |
There are many requests in the lantern database with a
connectStart
of zero. For example, inlantern-data/https---www-cnet-com--mobile-unthrottled-5-devtoolsLog.json
. All of these requests also have adnsStart
of 0 (by necessity), though not all requests with adnsStart
of 0 also have aconnectStart
of 0.From
cnet.com
:From
https://en-maktoob.yahoo.com/?p=xa
:connectStart
ANDsslStart
are both zero (connectStart: 0, connectEnd: 10.374, sslStart: 0, sslEnd: 10.362
). It's a h2 request, so it's unclear what this actually means. Surely doing a TCP or a SSL handshake takes more than <1ms, so I think we can assume this represents just a single roundtrip of connection time.(btw, this is a good link)