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

Address
Host

tls.cooluc.com

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 h3-29

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.

8FFF570F6E... 248.403 497.739
7A648CEF9A... 254.207 509.569

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: nginx/1.25.3 (Red Hat Enterprise Linux release 9.2 (Plow))
date: Fri, 01 Dec 2023 12:31:25 GMT
content-type: text/html; charset=utf-8
content-length: 5633
last-modified: Fri, 16 Dec 2022 21:22:34 GMT
vary: accept-encoding
etag: "639ce19a-1601"
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
x-quic: h3
x-xss-protection: 1
x-xss-protection: mod=block
strict-transport-security: max-age=63072000
public-key-pins: pin-sha256="BbrVIhEYvvBL6FiyC7nzVKLLDU3GPYdqHWAfk0ev/80="; pin-sha256="amMeV6gb9QNx0Zf7FtJ19Wa/t2B7KpCF/1n2Js3UuSU="; max-age=31536000; includeSubDomains
accept-ranges: bytes

Certificate Chain

Domain *.cooluc.com
Issued By AlphaSSL CA - SHA256 - G4
Expires Wednesday, August 28, 2024 at 10:25:26 AM GMT
Subject
Common Name *.cooluc.com
Issuer
Country BE
Organization GlobalSign nv-sa
Common Name AlphaSSL CA - SHA256 - G4
Serial Number 17662402092674078257272712769
Signature Algorithm sha256WithRSAEncryption
Version
Public Key Bits 2048
Public Key Type RSA
Domain AlphaSSL CA - SHA256 - G4
Issued By GlobalSign Root CA
Expires Tuesday, October 12, 2027 at 12:00:00 AM GMT
Subject
Country BE
Organization GlobalSign nv-sa
Common Name AlphaSSL CA - SHA256 - G4
Issuer
Country BE
Organization GlobalSign nv-sa
Unit Root CA
Common Name GlobalSign Root CA
Serial Number 166554658373203964493672915842458540151
Signature Algorithm sha256WithRSAEncryption
Version
Public Key Bits 2048
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": "tls.cooluc.com",
  "connections": [
    {
      "qlog_version": "0.1",
      "vantagepoint": "NETWORK",
      "connectionid": "8FFF570F6E60BEB5",
      "starttime": 2454200179815,
      "fields": [
        "time",
        "category",
        "type",
        "trigger",
        "data"
      ],
      "events": [
        [
          0,
          "CONNECTIVITY",
          "NEW_CONNECTION",
          "LINE",
          {
            "ip_version": "4",
            "srcip": "0.0.0.0",
            "dstip": "106.55.142.145",
            "srcport": "58739",
            "dstport": "443"
          }
        ],
        [
          63,
          "CONNECTIVITY",
          "VERNEG",
          "LINE",
          {
            "proposed_version": "00000001"
          }
        ],
        [
          248403,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "ff00000001088fff570f6e60beb5146de903171541d31b3788fecbfa7ddbe4...",
            "header": {
              "type": "RETRY",
              "payload_length": "122",
              "packet_number": "4611686018427387904"
            }
          }
        ],
        [
          248408,
          "CONNECTIVITY",
          "VERNEG",
          "PACKET_RX",
          {
            "agreed_version": "00000001"
          }
        ],
        [
          397096,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "ff00000001088fff570f6e60beb514c06fc65ffdd3a2ab18e00227705407bf...",
            "header": {
              "type": "RETRY",
              "payload_length": "122",
              "packet_number": "4611686018427387904"
            }
          }
        ],
        [
          496568,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "ca00000001088fff570f6e60beb51400000000000000014fb3a9ea3f34a498...",
            "header": {
              "type": "INIT",
              "payload_length": "138",
              "packet_number": "0"
            },
            "frames": [
              {
                "frame_type": "ACK"
              },
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          496857,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e300000001088fff570f6e60beb51400000000000000014fb3a9ea3f34a498...",
            "header": {
              "type": "HSK",
              "payload_length": "1030",
              "packet_number": "0"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          497079,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "eb00000001088fff570f6e60beb51400000000000000014fb3a9ea3f34a498...",
            "header": {
              "type": "HSK",
              "payload_length": "1184",
              "packet_number": "1"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          497421,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "ea00000001088fff570f6e60beb51400000000000000014fb3a9ea3f34a498...",
            "header": {
              "type": "HSK",
              "payload_length": "1170",
              "packet_number": "2"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          497646,
          "SECURITY",
          "CHECK_CERT",
          "CERTLOG",
          {
            "certificate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
          }
        ],
        [
          497646,
          "SECURITY",
          "CHECK_CERT",
          "CERTLOG",
          {
            "certificate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
          }
        ],
        [
          497739,
          "CONNECTIVITY",
          "HANDSHAKE",
          "PACKET_RX",
          {
            "status": "complete"
          }
        ],
        [
          703836,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "c500000001088fff570f6e60beb51400000000000000014fb3a9ea3f34a498",
            "header": {
              "type": "INIT",
              "payload_length": "59",
              "packet_number": "4611686018427387904"
            }
          }
        ],
        [
          1248524,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "508fff570f6e60beb55fa440b1109d27b5b63d68aee04632d04d5cd5a625f6...",
            "header": {
              "type": "SHORT",
              "payload_length": "1184",
              "packet_number": "0"
            },
            "frames": [
              {
                "frame_type": "STREAM"
              },
              {
                "frame_type": "ACK"
              },
              {
                "frame_type": "NEW_CONNECTION_ID"
              },
              {
                "frame_type": "CRYPTO"
              },
              {
                "frame_type": "NEW_TOKEN"
              },
              {
                "frame_type": "HANDSHAKE_DONE"
              }
            ]
          }
        ],
        [
          1248737,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "528fff570f6e60beb56f2be19a9ca6f33dc086dc2008c4501eb6afdd551229...",
            "header": {
              "type": "SHORT",
              "payload_length": "188",
              "packet_number": "1"
            },
            "frames": [
              {
                "frame_type": "STREAM"
              }
            ]
          }
        ]
      ]
    },
    {
      "qlog_version": "0.1",
      "vantagepoint": "NETWORK",
      "connectionid": "7A648CEF9AC06C61",
      "starttime": 2454201429222,
      "fields": [
        "time",
        "category",
        "type",
        "trigger",
        "data"
      ],
      "events": [
        [
          0,
          "CONNECTIVITY",
          "NEW_CONNECTION",
          "LINE",
          {
            "ip_version": "4",
            "srcip": "0.0.0.0",
            "dstip": "106.55.142.145",
            "srcport": "58739",
            "dstport": "443"
          }
        ],
        [
          29,
          "CONNECTIVITY",
          "VERNEG",
          "LINE",
          {
            "proposed_version": "00000001"
          }
        ],
        [
          254207,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "ff00000001087a648cef9ac06c61142a62127eb2c206276ee367d995e8dcab...",
            "header": {
              "type": "RETRY",
              "payload_length": "118",
              "packet_number": "4611686018427387904"
            }
          }
        ],
        [
          254211,
          "CONNECTIVITY",
          "VERNEG",
          "PACKET_RX",
          {
            "agreed_version": "00000001"
          }
        ],
        [
          404715,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "ff00000001087a648cef9ac06c61141f573b857ad892b7ad00ab34b39fe6cb...",
            "header": {
              "type": "RETRY",
              "payload_length": "118",
              "packet_number": "4611686018427387904"
            }
          }
        ],
        [
          509217,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "ce00000001087a648cef9ac06c61140000000000000001d39d575f0a42f548...",
            "header": {
              "type": "INIT",
              "payload_length": "144",
              "packet_number": "0"
            },
            "frames": [
              {
                "frame_type": "ACK"
              },
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          509500,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e600000001087a648cef9ac06c61140000000000000001d39d575f0a42f548...",
            "header": {
              "type": "HSK",
              "payload_length": "234",
              "packet_number": "0"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          509569,
          "CONNECTIVITY",
          "HANDSHAKE",
          "PACKET_RX",
          {
            "status": "complete"
          }
        ],
        [
          509583,
          "RECOVERY",
          "RTT_UPDATE",
          "PACKET_RX",
          {
            "zero_rtt": "successful"
          }
        ],
        [
          509611,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "537a648cef9ac06c6117a7584eeb8c290a1a42d9ae3394993cca59e8d380e5...",
            "header": {
              "type": "SHORT",
              "payload_length": "774",
              "packet_number": "0"
            },
            "frames": [
              {
                "frame_type": "STREAM"
              },
              {
                "frame_type": "PADDING"
              }
            ]
          }
        ],
        [
          703899,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "cd00000001087a648cef9ac06c61140000000000000001d39d575f0a42f548",
            "header": {
              "type": "INIT",
              "payload_length": "59",
              "packet_number": "4611686018427387904"
            }
          }
        ],
        [
          1274192,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "537a648cef9ac06c6155caf75edb7478571045bb8ee33ec11fe284e6c317ef...",
            "header": {
              "type": "SHORT",
              "payload_length": "628",
              "packet_number": "1"
            },
            "frames": [
              {
                "frame_type": "NEW_CONNECTION_ID"
              },
              {
                "frame_type": "CRYPTO"
              },
              {
                "frame_type": "NEW_TOKEN"
              },
              {
                "frame_type": "HANDSHAKE_DONE"
              }
            ]
          }
        ],
        [
          1309164,
          "TRANSPORT",
          "PACKET_RX",
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