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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.

B3B6D82B28... 3.131 8.012
9172B4AD5A... 2.967 3.187

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
server: cloudflare
content-type: text/html; charset=utf-8
last-modified: Wed, 05 Nov 2025 22:23:46 GMT
access-control-allow-origin: *
report-to: {"group":"cf-nel","max_age":604800,"endpoints":[{"url":"https://a.nel.cloudflare.com/report/v4?s=rdGnx31GUwdmtOp3g3I14NvGp3GM6Ith1NpsOjdPneGFeoakoGrs1qKl3%2BzeXgPQZTr%2BbywmibrETVirmvVF5Y4Q4u3zZsHIkf4he7Xu4Q%2BsCD%2BNFz7qx2%2BFsQy4EIURmlBPMs75DgkMPeQkgIE%3D"}]}
expires: Fri, 15 May 2026 05:27:01 GMT
cache-control: max-age=14400
priority: u=3,i=?0
x-proxy-cache: MISS
x-github-request-id: A7C8:3535D7:17A6F2A:196E489:69C5036A
nel: {"report_to":"cf-nel","success_fraction":0.0,"max_age":604800}
age: 0
date: Fri, 15 May 2026 05:17:01 GMT
via: 1.1 varnish
x-served-by: cache-lga21942-LGA
x-cache: MISS
x-cache-hits: 0
x-timer: S1774519147.179593,VS0,VE45
vary: Accept-Encoding
x-fastly-request-id: a9a06f2d9622d7888fbfcf626a3cd3e3d67846fd
server-timing: cfCacheStatus;desc="HIT"
server-timing: cfEdge;dur=6,cfOrigin;dur=0
server-timing: cfExtPri
cf-cache-status: HIT
x-content-type-options: nosniff
strict-transport-security: max-age=15552000; includeSubDomains; preload
cf-ray: 9fbfac84cf92aa39-EWR
alt-svc: h3=":443"; ma=86400

Certificate Chain

Domain robinwinslow.uk
Issued By WE1
Expires Thursday, July 09, 2026 at 12:33:33 AM GMT
Subject
Common Name robinwinslow.uk
Issuer
Country US
Organization Google Trust Services
Common Name WE1
Serial Number 55866749535573963015484703367128266591
Signature Algorithm ecdsa-with-SHA256
Version
Public Key Bits 256
Public Key Type DSA
Domain WE1
Issued By GTS Root R4
Expires Tuesday, February 20, 2029 at 02:00:00 PM GMT
Subject
Country US
Organization Google Trust Services
Common Name WE1
Issuer
Country US
Organization Google Trust Services LLC
Common Name GTS Root R4
Serial Number 170074200136485300614847617070429275619
Signature Algorithm ecdsa-with-SHA384
Version
Public Key Bits 256
Public Key Type DSA
Domain GTS Root R4
Issued By GlobalSign Root CA
Expires Friday, January 28, 2028 at 12:00:42 AM GMT
Subject
Country US
Organization Google Trust Services LLC
Common Name GTS Root R4
Issuer
Country BE
Organization GlobalSign nv-sa
Unit Root CA
Common Name GlobalSign Root CA
Serial Number 170001980149335831901244157168837298715
Signature Algorithm sha256WithRSAEncryption
Version
Public Key Bits 384
Public Key Type DSA

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": "B3B6D82B28686D13",
      "starttime": 18740642389751,
      "fields": [
        "time",
        "category",
        "type",
        "trigger",
        "data"
      ],
      "events": [
        [
          0,
          "CONNECTIVITY",
          "NEW_CONNECTION",
          "LINE",
          {
            "ip_version": "6",
            "srcip": "::",
            "dstip": "2606:4700:3031::ac43:cf7a",
            "srcport": "47764",
            "dstport": "443"
          }
        ],
        [
          116,
          "CONNECTIVITY",
          "VERNEG",
          "LINE",
          {
            "proposed_version": "00000001"
          }
        ],
        [
          3131,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "cd0000000108b3b6d82b28686d1314012aabcefbd01ae5f22946cea5d578e5",
            "header": {
              "type": "INIT",
              "payload_length": "44",
              "packet_number": "0"
            },
            "frames": [
              {
                "frame_type": "ACK"
              }
            ]
          }
        ],
        [
          3134,
          "CONNECTIVITY",
          "VERNEG",
          "PACKET_RX",
          {
            "agreed_version": "00000001"
          }
        ],
        [
          6411,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "ce0000000108b3b6d82b28686d1314012aabcefbd01ae5f22946cea5d578e5...",
            "header": {
              "type": "INIT",
              "payload_length": "133",
              "packet_number": "1"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          6779,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "ea0000000108b3b6d82b28686d1314012aabcefbd01ae5f22946cea5d578e5...",
            "header": {
              "type": "HSK",
              "payload_length": "1184",
              "packet_number": "2"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          7144,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "ef0000000108b3b6d82b28686d1314012aabcefbd01ae5f22946cea5d578e5...",
            "header": {
              "type": "HSK",
              "payload_length": "1184",
              "packet_number": "3"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          7436,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e40000000108b3b6d82b28686d1314012aabcefbd01ae5f22946cea5d578e5...",
            "header": {
              "type": "HSK",
              "payload_length": "518",
              "packet_number": "4"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          7691,
          "SECURITY",
          "CHECK_CERT",
          "CERTLOG",
          {
            "certificate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
          }
        ],
        [
          7691,
          "SECURITY",
          "CHECK_CERT",
          "CERTLOG",
          {
            "certificate": "3082029F30820225A00302010202107FF31977972C224A76155D13B6D685E3300A06082A8648CE3D0403033047310B300906035504061302555331223020060355040A1319476F6F676C65205472757374205365727669636573204C4C43311430120603550403130B47545320526F6F74205234301E170D3233313231333039303030305A170D3239303232303134303030305A303B310B3009060355040613025553311E301C060355040A1315476F6F676C65205472757374205365727669636573310C300A060355040313035745313059301306072A8648CE3D020106082A8648CE3D030107034200046FCD3AFE6757474C21038540C2475DBB58470F40C15C1785C61937E7D57CED864B9B81D9D71A13A50A03F898C4C6E89EFF10598F2C2698F5E62625BB0F02FA56A381FE3081FB300E0603551D0F0101FF040403020186301D0603551D250416301406082B0601050507030106082B0601050507030230120603551D130101FF040830060101FF020100301D0603551D0E041604149077923567C4FFA8CCA9E67BD980797BCC93F938301F0603551D23041830168014804CD6EB74FF4936A3D5D8FCB53EC56AF0941D8C303406082B0601050507010104283026302406082B060105050730028618687474703A2F2F692E706B692E676F6F672F72342E637274302B0603551D1F042430223020A01EA01C861A687474703A2F2F632E706B692E676F6F672F722F72342E63726C30130603551D20040C300A3008060667810C010201300A06082A8648CE3D0403030368003065023100E702AB51D6F74395CE75FED11194D5CC40417A26BED80CF3322D3D90AE150F234812528F3E647913AFF5A62C026E55B102302689CC680162E789AB7E17E814D6447EE34C490EBF6C806234B8B2A17E3A168850BCA788A09F7D731EEC52414DEEE256"
          }
        ],
        [
          7691,
          "SECURITY",
          "CHECK_CERT",
          "CERTLOG",
          {
            "certificate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
          }
        ],
        [
          8012,
          "CONNECTIVITY",
          "HANDSHAKE",
          "PACKET_RX",
          {
            "status": "complete"
          }
        ],
        [
          9012,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "c70000000108b3b6d82b28686d1314012aabcefbd01ae5f22946cea5d578e5",
            "header": {
              "type": "INIT",
              "payload_length": "60",
              "packet_number": "4611686018427387904"
            }
          }
        ],
        [
          10460,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "4fb3b6d82b28686d13c4aba96c37402f9d666ef524810e2cdf335ea6aa8b46...",
            "header": {
              "type": "SHORT",
              "payload_length": "504",
              "packet_number": "6"
            },
            "frames": [
              {
                "frame_type": "ACK"
              },
              {
                "frame_type": "NEW_CONNECTION_ID"
              },
              {
                "frame_type": "CRYPTO"
              },
              {
                "frame_type": "HANDSHAKE_DONE"
              }
            ]
          }
        ],
        [
          10712,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "44b3b6d82b28686d13c71993d1e49c93281fd68709ddba7b530435930a7e20",
            "header": {
              "type": "SHORT",
              "payload_length": "39",
              "packet_number": "7"
            },
            "frames": [
              {
                "frame_type": "STREAM"
              }
            ]
          }
        ],
        [
          10754,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "53b3b6d82b28686d13c381db7120bbbc7cf544afe20e9ae2b4a0a74682e323",
            "header": {
              "type": "SHORT",
              "payload_length": "16",
              "packet_number": "8"
            },
            "frames": [
              {
                "frame_type": "STREAM"
              }
            ]
          }
        ],
        [
          10877,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "53b3b6d82b28686d13eb16352f040ef0684bfacf76fabddc9df87e2833cdc2",
            "header": {
              "type": "SHORT",
              "payload_length": "16",
              "packet_number": "9"
            },
            "frames": [
              {
                "frame_type": "STREAM"
              }
            ]
          }
        ],
        [
          13005,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "5cb3b6d82b28686d13c9cab29318d93179a32676b10ad41a70fe0151799b27",
            "header": {
              "type": "SHORT",
              "payload_length": "15",
              "packet_number": "10"
            },
            "frames": [
              {
                "frame_type": "ACK"
              }
            ]
          }
        ],
        [
          20225,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "40b3b6d82b28686d13242acfb248fd6700cb335a951d5d5bd2122f4d73a4e5...",
            "header": {
              "type": "SHORT",
              "payload_length": "847",
              "packet_number": "11"
            },
            "frames": [
              {
                "frame_type": "STREAM"
              }
            ]
          }
        ]
      ]
    },
    {
      "qlog_version": "0.1",
      "vantagepoint": "NETWORK",
      "connectionid": "9172B4AD5A95D989",
      "starttime": 18740642410451,
      "fields": [
        "time",
        "category",
        "type",
        "trigger",
        "data"
      ],
      "events": [
        [
          0,
          "CONNECTIVITY",
          "NEW_CONNECTION",
          "LINE",
          {
            "ip_version": "6",
            "srcip": "::",
            "dstip": "2606:4700:3031::ac43:cf7a",
            "srcport": "47764",
            "dstport": "443"
          }
        ],
        [
          40,
          "CONNECTIVITY",
          "VERNEG",
          "LINE",
          {
            "proposed_version": "00000001"
          }
        ],
        [
          2967,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "c400000001089172b4ad5a95d98914012cc38d2d6a53fd8e2f2e8d736f31fd...",
            "header": {
              "type": "INIT",
              "payload_length": "144",
              "packet_number": "0"
            },
            "frames": [
              {
                "frame_type": "ACK"
              },
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          2969,
          "CONNECTIVITY",
          "VERNEG",
          "PACKET_RX",
          {
            "agreed_version": "00000001"
          }
        ],
        [
          3138,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e700000001089172b4ad5a95d98914012cc38d2d6a53fd8e2f2e8d736f31fd...",
            "header": {
              "type": "HSK",
              "payload_length": "187",
              "packet_number": "1"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          3187,
          "CONNECTIVITY",
          "HANDSHAKE",
          "PACKET_RX",
          {
            "status": "complete"
          }
        ],
        [
          3273,
          "RECOVERY",
          "RTT_UPDATE",
          "PACKET_RX",
          {
            "zero_rtt": "successful"
          }
        ],
        [
          3312,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "4c9172b4ad5a95d98921278b7cbcb4ce09ae04657a13932d874183d5bfa97e...",
            "header": {
              "type": "SHORT",
              "payload_length": "821",
              "packet_number": "2"
            },
            "frames": [
              {
                "frame_type": "ACK"
              },
              {
                "frame_type": "PADDING"
              },
              {
                "frame_type": "NEW_CONNECTION_ID"
              },
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
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