Use Advanced Search to bypass hostname resolution and use a custom IP address or port.

Address
Host

robinwinslow.uk

QUIC is supported

HTTP/3 is supported

HTTP/3 Check established a QUIC connection for all attempts made with the given endpoint. See the metrics below for more information.

0-RTT

Zero Round Trip Time Resumption (0-RTT)

The QUIC handshake for this connection was completed without any additional round-trips.

SUCCESS
h3

QUIC Versions

These are the QUIC versions supported by this QUIC endpoint.

AGREED SUPPORTED
Connection ID

Connection ID

This unique identifier for a QUIC connection is used to ensure that changes to an endpoint's lower network layer address (UDP/IP) does not affect the delivery of the QUIC connection's packets.

This tool attempts two connections to test the server's 0-RTT capabilities. During the first connection, the client receives important handshake material from the server. With 0-RTT, the client can start to send data immediately if it uses this handshake material when it creates the second connection.

Packet RX

Packet RX

This value represents the time between the first packet sent and the first packet received (measured in milliseconds).

Handshake Done

Handshake Done

This value represents the time between when the first packet is sent and when the handshake is completed (measured in milliseconds).

Take notice of the difference in this metric between the first connection and the second connection. Using 0-RTT, future connections (i.e. the second connection) can complete the handshake much faster than the original connection.

7BAAE528BC... 2.976 10.76
44BFE2C378... 153.381 153.743

Read detailed descriptions of the items and metrics shown above.

HTTP/3 Statistics

Zero Round Trip Time Resumption (0-RTT)

The QUIC handshake for this connection was completed without any additional round-trips.

SUCCESS

QUIC Versions

These are the QUIC versions supported by this QUIC endpoint.

AGREED SUPPORTED

Connection ID

This unique identifier for a QUIC connection is used to ensure that changes to an endpoint's lower network layer address (UDP/IP) does not affect the delivery of the QUIC connection's packets.

This tool attempts two connections to test the server's 0-RTT capabilities. During the first connection, the client receives important handshake material from the server. With 0-RTT, the client can start to send data immediately if it uses this handshake material when it creates the second connection.


Packet RX

This value represents the time between the first packet sent and the first packet received (measured in milliseconds).


Handshake Done

This value represents the time between when the first packet is sent and when the handshake is completed (measured in milliseconds).

Take notice of the difference in this metric between the first connection and the second connection. Using 0-RTT, future connections (i.e. the second connection) can complete the handshake much faster than the original connection.


QLog

QLog is a standard under development for QUIC Connection debugging and visualization. Learn more at https://quic.edm.uhasselt.be/

To view or download the raw QLog ("application/json"), add "format=qlog" to the HTTP query string.

HTTP Header

HTTP/1.1 200 OK
date: Thu, 18 Apr 2024 03:54:39 GMT
content-type: text/html; charset=utf-8
last-modified: Thu, 14 Dec 2023 23:34:27 GMT
access-control-allow-origin: *
expires: Thu, 18 Apr 2024 04:04:39 GMT
cache-control: max-age=600
x-proxy-cache: MISS
x-github-request-id: 608E:244213:2BC3DBE:38E6BAC:6620997F
via: 1.1 varnish
age: 0
x-served-by: cache-lga21972-LGA
x-cache: HIT
x-cache-hits: 1
x-timer: S1713412479.354372,VS0,VE2
vary: Accept-Encoding
x-fastly-request-id: 8cf29b8c89605867c6589e413a67b1d3ca68db75
cf-cache-status: DYNAMIC
priority: u=3,i=?0
report-to: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v4?s=FwF1kOMlZOnRHVBKi62kjE%2FQ4aiGVFIVQPUV1EIDbr%2BIJ23t9FN6hEoOWRxu4gw3CJ0yi4tl69eMpMahniOEqZLp7WUeOkqYCbwm0QhFHm3LYsS%2FYZ8MDGUEhRKdi2MJY5gKwB7jDV8XHiH6Dn0%3D"}],"group":"cf-nel","max_age":604800}
nel: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
strict-transport-security: max-age=15552000; includeSubDomains; preload
x-content-type-options: nosniff
server: cloudflare
cf-ray: 8761b6fbde120ca5-EWR
alt-svc: h3=":443"; ma=86400

Certificate Chain

Domain robinwinslow.uk
Issued By E1
Expires Saturday, June 01, 2024 at 02:41:53 PM GMT
Subject
Common Name robinwinslow.uk
Issuer
Country US
Organization Let's Encrypt
Common Name E1
Serial Number 389573893122554060778259874596998534345139
Signature Algorithm ecdsa-with-SHA384
Version
Public Key Bits 256
Public Key Type DSA

Domain E1
Issued By ISRG Root X2
Expires Monday, September 15, 2025 at 04:00:00 PM GMT
Subject
Country US
Organization Let's Encrypt
Common Name E1
Issuer
Country US
Organization Internet Security Research Group
Common Name ISRG Root X2
Serial Number 238917698029532949600116015593252145733
Signature Algorithm ecdsa-with-SHA384
Version
Public Key Bits 384
Public Key Type DSA

Domain ISRG Root X2
Issued By ISRG Root X1
Expires Monday, September 15, 2025 at 04:00:00 PM GMT
Subject
Country US
Organization Internet Security Research Group
Common Name ISRG Root X2
Issuer
Country US
Organization Internet Security Research Group
Common Name ISRG Root X1
Serial Number 10126462700708491348274246233644721251
Signature Algorithm sha256WithRSAEncryption
Version
Public Key Bits 384
Public Key Type DSA

Domain ISRG Root X1
Issued By DST Root CA X3
Expires Monday, September 30, 2024 at 06:14:03 PM GMT
Subject
Country US
Organization Internet Security Research Group
Common Name ISRG Root X1
Issuer
Organization Digital Signature Trust Co.
Common Name DST Root CA X3
Serial Number 85078200265644417569109389142156118711
Signature Algorithm sha256WithRSAEncryption
Version
Public Key Bits 4096
Public Key Type RSA

QLog Output

QLog

QLog is a standard under development for QUIC Connection debugging and visualization. Learn more at https://quic.edm.uhasselt.be/

To view or download the raw QLog ("application/json"), add "format=qlog" to the HTTP query string.

{
  "qlog_version": "0.1",
  "description": "robinwinslow.uk",
  "connections": [
    {
      "qlog_version": "0.1",
      "vantagepoint": "NETWORK",
      "connectionid": "7BAAE528BC290253",
      "starttime": 7712234850619,
      "fields": [
        "time",
        "category",
        "type",
        "trigger",
        "data"
      ],
      "events": [
        [
          0,
          "CONNECTIVITY",
          "NEW_CONNECTION",
          "LINE",
          {
            "ip_version": "6",
            "srcip": "::",
            "dstip": "2606:4700:3033::6815:2ab4",
            "srcport": "47174",
            "dstport": "443"
          }
        ],
        [
          64,
          "CONNECTIVITY",
          "VERNEG",
          "LINE",
          {
            "proposed_version": "00000001"
          }
        ],
        [
          2976,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "c800000001087baae528bc2902531401785786f2033d36dd785c87c60339a8",
            "header": {
              "type": "INIT",
              "payload_length": "45",
              "packet_number": "0"
            },
            "frames": [
              {
                "frame_type": "ACK"
              }
            ]
          }
        ],
        [
          2978,
          "CONNECTIVITY",
          "VERNEG",
          "PACKET_RX",
          {
            "agreed_version": "00000001"
          }
        ],
        [
          8056,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "c800000001087baae528bc2902531401785786f2033d36dd785c87c60339a8...",
            "header": {
              "type": "INIT",
              "payload_length": "133",
              "packet_number": "1"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          8262,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "ef00000001087baae528bc2902531401785786f2033d36dd785c87c60339a8...",
            "header": {
              "type": "HSK",
              "payload_length": "1184",
              "packet_number": "0"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          8467,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e400000001087baae528bc2902531401785786f2033d36dd785c87c60339a8...",
            "header": {
              "type": "HSK",
              "payload_length": "1184",
              "packet_number": "1"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          8665,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "ea00000001087baae528bc2902531401785786f2033d36dd785c87c60339a8...",
            "header": {
              "type": "HSK",
              "payload_length": "974",
              "packet_number": "2"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          10278,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "c100000001087baae528bc2902531401785786f2033d36dd785c87c60339a8",
            "header": {
              "type": "INIT",
              "payload_length": "60",
              "packet_number": "4611686018427387904"
            }
          }
        ],
        [
          10313,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e400000001087baae528bc2902531401785786f2033d36dd785c87c60339a8...",
            "header": {
              "type": "HSK",
              "payload_length": "1124",
              "packet_number": "3"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          10556,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e600000001087baae528bc2902531401785786f2033d36dd785c87c60339a8...",
            "header": {
              "type": "HSK",
              "payload_length": "136",
              "packet_number": "4"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          10569,
          "SECURITY",
          "CHECK_CERT",
          "CERTLOG",
          {
            "certificate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
          }
        ],
        [
          10569,
          "SECURITY",
          "CHECK_CERT",
          "CERTLOG",
          {
            "certificate": "308202C63082024DA003020102021100B3BDDFF8A7845BBCE903A04135B34A45300A06082A8648CE3D040303304F310B300906035504061302555331293027060355040A1320496E7465726E65742053656375726974792052657365617263682047726F7570311530130603550403130C4953524720526F6F74205832301E170D3230303930343030303030305A170D3235303931353136303030305A3032310B300906035504061302555331163014060355040A130D4C6574277320456E6372797074310B30090603550403130245313076301006072A8648CE3D020106052B8104002203620004245C2DA22AFD1C4BA65D97732731ACB2A06962EF65E8A6B0F0AC4B9FFF1C0B700FD3982F4DFC0F009B37F074055732972E05EF2A4325A3FB6E342713F64F7E69D302995EEB244792C1249BE6B1218FC12481FC68CC1F69BA58F51922F774C616A382010830820104300E0603551D0F0101FF040403020186301D0603551D250416301406082B0601050507030206082B0601050507030130120603551D130101FF040830060101FF020100301D0603551D0E041604145AF3ED2BFC36C23779B95230EA546FCF55CB2EAC301F0603551D230418301680147C4296AEDE4B483BFA92F89E8CCF6D8BA9723795303206082B0601050507010104263024302206082B060105050730028616687474703A2F2F78322E692E6C656E63722E6F72672F30270603551D1F0420301E301CA01AA0188616687474703A2F2F78322E632E6C656E63722E6F72672F30220603551D20041B30193008060667810C010201300D060B2B0601040182DF13010101300A06082A8648CE3D040303036700306402307B74D552138D61FE0DBA3F03009DF3D79884D9572EBDE90F9C5C480421F2CBB360728E97D6124FCA44F642C9D37B86A902305AB1B1B4EDEA609920B13803CA3DA026B8EE6E2D4AF6C6661F339ADB924AD5F52913C6706228BA238CCF3D2FCB82E97F"
          }
        ],
        [
          10569,
          "SECURITY",
          "CHECK_CERT",
          "CERTLOG",
          {
            "certificate": "3082046030820248A0030201020210079E492886376FD40848C23FC631E463300D06092A864886F70D01010B0500304F310B300906035504061302555331293027060355040A1320496E7465726E65742053656375726974792052657365617263682047726F7570311530130603550403130C4953524720526F6F74205831301E170D3230303930343030303030305A170D3235303931353136303030305A304F310B300906035504061302555331293027060355040A1320496E7465726E65742053656375726974792052657365617263682047726F7570311530130603550403130C4953524720526F6F742058323076301006072A8648CE3D020106052B8104002203620004CD9BD59F80830AEC094AF3164A3E5CCF77ACDE67050D1D07B6DC16FB5A8B14DBE27160C4BA459511898EEA06DFF72A161CA4B9C5C532E003E01E8218388BD745D80A6A6EE60077FB02517D22D80A6E9A5B77DFF0FA41EC39DC75CA68070C1FEAA381E53081E2300E0603551D0F0101FF040403020106300F0603551D130101FF040530030101FF301D0603551D0E041604147C4296AEDE4B483BFA92F89E8CCF6D8BA9723795301F0603551D2304183016801479B459E67BB6E5E40173800888C81A58F6E99B6E303206082B0601050507010104263024302206082B060105050730028616687474703A2F2F78312E692E6C656E63722E6F72672F30270603551D1F0420301E301CA01AA0188616687474703A2F2F78312E632E6C656E63722E6F72672F30220603551D20041B30193008060667810C010201300D060B2B0601040182DF13010101300D06092A864886F70D01010B050003820201001B7F252B907A0876007718E1C32E8A364C417EBF174BE330D75B0C7E9C96986F7BB068C02444CCE2F2FCD1EADBD29F01F9174D0C9D55FDA5AD6DD22F3F4B72C02EAE73C7251657C23E15ADE031D10A84846C6278423122461AED7A40BF9716814477CA6C7B5D215C07F2119121BFE12FC2EF6EFD0520E4B4F779F32DBB372AF0C6B1ACAC51F51FB35A1E66CE580718387F71A93C83BAD7BC829E9A760F9EB029FDCBF38907481BFEAB932E14210D5FAF8EB754AB5D0ED45B4C71D092EA3DA3369B7C1FE03B55B9D85353CC8366BB4ADC810600188BF4B3D748B11341B9C4B69ECF2C778E42200B807E9FC5AB48DBBC6F048D6C4629020D708A1DF11273B64624429E2A1718E3ACC798C272CC6D2D766DDD2C2B2696A5CF21081BE5DA2FCBEF9F7393AEF8365F478F9728CEABE29826988BFDEE28322229ED4C9509C420FA07E1862C44F68147C0E46232ED1DD83C488896C35E91B6AF7B59A4EEE3869CC78858CA282A66559B8580B91DD8402BC91C133CA9EBDE99C21640F6F5A4AE2A256C52BAC7044CB432BBFC385CA00C617B57EC774E50CFAF06A20F378CE10ED2D32F1ABD9C713ECCE1F8D1A8A3BD04F619C0F986AFF50E1AAA956BEFCA47714B631C4D96DB55230A9D0F8175A0E640F56446036ECEFA6A7D06ECA4340674DA53D8B9B8C6237DA9F82A2DA482A62E2D11CAE6CD31587985E6721CA79FD34CD066D0A7BB"
          }
        ],
        [
          10569,
          "SECURITY",
          "CHECK_CERT",
          "CERTLOG",
          {
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}