HTTP/3 Check - www.mostertman.com

About

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

www.mostertman.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

CID 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.	RX Packet RX This value represents the time between the first packet sent and the first packet received (measured in milliseconds).	HSK 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.
9C3..	87.76	188.91
9D4..	85.56	184.19

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/1.1 302 Found
server: nginx
date: Thu, 12 Feb 2026 15:28:21 GMT
content-type: text/html; charset=UTF-8
set-cookie: grav-site-00c2a16=ce25faaa32d0f9802ac5a7b8247caf8e; expires=Thu, 12 Feb 2026 15:58:21 GMT; Max-Age=1800; path=/; domain=mostertman.com; secure; HttpOnly; SameSite=Lax
expires: Thu, 19 Feb 2026 15:28:21 GMT
cache-control: max-age=604800
pragma: no-cache
location: /en
alt-svc: h3=":443"; ma=86400
cross-origin-embedder-policy: credentialless
cross-origin-opener-policy: same-origin
cross-origin-resource-policy: same-origin
expect-ct: max-age=31536000, enforce
referrer-policy: same-origin
strict-transport-security: max-age=31536000; includeSubDomains; preload
x-content-type-options: nosniff
x-frame-options: SAMEORIGIN
x-ua-compatible: IE=Edge
x-xss-protection: 0
content-security-policy: default-src 'self'; script-src 'self' 'unsafe-eval' 'unsafe-inline' https://gumroad.com/js/gumroad.js https://assets.gumroad.com/packs/js/; style-src 'self' 'unsafe-inline' https://assets.gumroad.com/packs/css/; img-src 'self' data: https://www.gravatar.com https://placehold.co/50x50/; font-src 'self' data: https://assets.gumroad.com/packs/static/; frame-ancestors 'self'; base-uri 'self'; form-action 'self';
permissions-policy: accelerometer=(), autoplay=(), camera=(), encrypted-media=(), fullscreen=(), geolocation=(), gyroscope=(), magnetometer=(), microphone=(), midi=(), payment=(), picture-in-picture=(), sync-xhr=(), usb=()

Certificate Chain

Domain	mostertman.com
Issued By	E8
Expires	Tuesday, April 28, 2026 at 06:08:25 AM GMT
	This certificate is valid

Subject
Common Name	mostertman.com

Issuer
Country	US
Organization	Let's Encrypt
Common Name	E8

Serial Number	604052527209272234918589871462853301094153
Signature Algorithm	ecdsa-with-SHA384
Version

Public Key Bits	384
Public Key Type	DSA

Domain	E8
Issued By	ISRG Root X1
Expires	Friday, March 12, 2027 at 11:59:59 PM GMT

Subject
Country	US
Organization	Let's Encrypt
Common Name	E8

Issuer
Country	US
Organization	Internet Security Research Group
Common Name	ISRG Root X1

Serial Number	132370213232563105872410966929454918998
Signature Algorithm	sha256WithRSAEncryption
Version

Public Key Bits	384
Public Key Type	DSA

Domain	ISRG Root X1
Issued By	ISRG Root X1
Expires	Monday, June 04, 2035 at 11:04:38 AM GMT

Subject
Country	US
Organization	Internet Security Research Group
Common Name	ISRG Root X1

Issuer
Country	US
Organization	Internet Security Research Group
Common Name	ISRG Root X1

Serial Number	172886928669790476064670243504169061120
Signature Algorithm	sha256WithRSAEncryption
Version

Public Key Bits	4096
Public Key Type	RSA

QLog Output

{
  "qlog_version": "0.1",
  "description": "www.mostertman.com",
  "connections": [
    {
      "qlog_version": "0.1",
      "vantagepoint": "NETWORK",
      "connectionid": "9C339C9128CCF5C4",
      "starttime": 10828521883842,
      "fields": [
        "time",
        "category",
        "type",
        "trigger",
        "data"
      ],
      "events": [
        [
          0,
          "CONNECTIVITY",
          "NEW_CONNECTION",
          "LINE",
          {
            "ip_version": "6",
            "srcip": "::",
            "dstip": "2a01:4f8:c2c:8457::1",
            "srcport": "56706",
            "dstport": "443"
          }
        ],
        [
          58,
          "CONNECTIVITY",
          "VERNEG",
          "LINE",
          {
            "proposed_version": "00000001"
          }
        ],
        [
          87759,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "c900000001089c339c9128ccf5c414000000000000000dd67f90ad47b90c73...",
            "header": {
              "type": "INIT",
              "payload_length": "1184",
              "packet_number": "0"
            },
            "frames": [
              {
                "frame_type": "ACK"
              },
              {
                "frame_type": "PADDING"
              },
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          87763,
          "CONNECTIVITY",
          "VERNEG",
          "PACKET_RX",
          {
            "agreed_version": "00000001"
          }
        ],
        [
          186896,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "c000000001089c339c9128ccf5c414000000000000000dd67f90ad47b90c73...",
            "header": {
              "type": "INIT",
              "payload_length": "203",
              "packet_number": "1"
            },
            "frames": [
              {
                "frame_type": "ACK"
              },
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          187704,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e500000001089c339c9128ccf5c414000000000000000dd67f90ad47b90c73...",
            "header": {
              "type": "HSK",
              "payload_length": "965",
              "packet_number": "0"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          187879,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e400000001089c339c9128ccf5c414000000000000000dd67f90ad47b90c73...",
            "header": {
              "type": "HSK",
              "payload_length": "1184",
              "packet_number": "1"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          188065,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e300000001089c339c9128ccf5c414000000000000000dd67f90ad47b90c73...",
            "header": {
              "type": "HSK",
              "payload_length": "433",
              "packet_number": "2"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          188182,
          "SECURITY",
          "CHECK_CERT",
          "CERTLOG",
          {
            "certificate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
          }
        ],
        [
          188182,
          "SECURITY",
          "CHECK_CERT",
          "CERTLOG",
          {
            "certificate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
          }
        ],
        [
          188908,
          "CONNECTIVITY",
          "HANDSHAKE",
          "PACKET_RX",
          {
            "status": "complete"
          }
        ],
        [
          439064,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "c100000001089c339c9128ccf5c414000000000000000dd67f90ad47b90c73",
            "header": {
              "type": "INIT",
              "payload_length": "57",
              "packet_number": "4611686018427387904"
            }
          }
        ],
        [
          439171,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "ca00000001089c339c9128ccf5c414000000000000000dd67f90ad47b90c73",
            "header": {
              "type": "INIT",
              "payload_length": "57",
              "packet_number": "4611686018427387904"
            }
          }
        ],
        [
          439189,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e400000001089c339c9128ccf5c414000000000000000dd67f90ad47b90c73",
            "header": {
              "type": "HSK",
              "payload_length": "40",
              "packet_number": "3"
            },
            "frames": [
              {
                "frame_type": "PADDING"
              },
              {
                "frame_type": "PING"
              }
            ]
          }
        ],
        [
          439288,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e100000001089c339c9128ccf5c414000000000000000dd67f90ad47b90c73",
            "header": {
              "type": "HSK",
              "payload_length": "40",
              "packet_number": "4"
            },
            "frames": [
              {
                "frame_type": "PADDING"
              },
              {
                "frame_type": "PING"
              }
            ]
          }
        ],
        [
          456474,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "4f9c339c9128ccf5c43931298746caa916fd62523146ed401ee27b35d86e7d...",
            "header": {
              "type": "SHORT",
              "payload_length": "438",
              "packet_number": "0"
            },
            "frames": [
              {
                "frame_type": "STREAM"
              },
              {
                "frame_type": "ACK"
              },
              {
                "frame_type": "NEW_CONNECTION_ID"
              },
              {
                "frame_type": "CRYPTO"
              },
              {
                "frame_type": "HANDSHAKE_DONE"
              }
            ]
          }
        ],
        [
          554265,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "519c339c9128ccf5c43507df353917416d7efaf704741c5db0c4bc96e39617...",
            "header": {
              "type": "SHORT",
              "payload_length": "1334",
              "packet_number": "4"
            },
            "frames": [
              {
                "frame_type": "PADDING"
              },
              {
                "frame_type": "PING"
              }
            ]
          }
        ],
        [
          568497,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "589c339c9128ccf5c4922891e368d28d61809109b8e54bdb8e984fc7c74daf",
            "header": {
              "type": "SHORT",
              "payload_length": "16",
              "packet_number": "5"
            },
            "frames": [
              {
                "frame_type": "ACK"
              }
            ]
          }
        ],
        [
          661253,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "5e9c339c9128ccf5c4511bc6a6a633e9098ea1dd84a4d9700466936388dc8c...",
            "header": {
              "type": "SHORT",
              "payload_length": "1094",
              "packet_number": "6"
            },
            "frames": [
              {
                "frame_type": "STREAM"
              }
            ]
          }
        ]
      ]
    },
    {
      "qlog_version": "0.1",
      "vantagepoint": "NETWORK",
      "connectionid": "9D411472E4BA2384",
      "starttime": 10828522545523,
      "fields": [
        "time",
        "category",
        "type",
        "trigger",
        "data"
      ],
      "events": [
        [
          0,
          "CONNECTIVITY",
          "NEW_CONNECTION",
          "LINE",
          {
            "ip_version": "6",
            "srcip": "::",
            "dstip": "2a01:4f8:c2c:8457::1",
            "srcport": "56706",
            "dstport": "443"
          }
        ],
        [
          33,
          "CONNECTIVITY",
          "VERNEG",
          "LINE",
          {
            "proposed_version": "00000001"
          }
        ],
        [
          85559,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "cb00000001089d411472e4ba238414000000000000000d36d6708cf15e3f2c...",
            "header": {
              "type": "INIT",
              "payload_length": "1184",
              "packet_number": "0"
            },
            "frames": [
              {
                "frame_type": "ACK"
              },
              {
                "frame_type": "PADDING"
              },
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          85563,
          "CONNECTIVITY",
          "VERNEG",
          "PACKET_RX",
          {
            "agreed_version": "00000001"
          }
        ],
        [
          183291,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "ce00000001089d411472e4ba238414000000000000000d36d6708cf15e3f2c...",
            "header": {
              "type": "INIT",
              "payload_length": "209",
              "packet_number": "1"
            },
            "frames": [
              {
                "frame_type": "ACK"
              },
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          184106,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "ea00000001089d411472e4ba238414000000000000000d36d6708cf15e3f2c...",
            "header": {
              "type": "HSK",
              "payload_length": "959",
              "packet_number": "0"
            },
            "frames": [
              {
                "frame_type": "PADDING"
              },
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          184194,
          "CONNECTIVITY",
          "HANDSHAKE",
          "PACKET_RX",
          {
            "status": "complete"
          }
        ],
        [
          184236,
          "RECOVERY",
          "RTT_UPDATE",
          "PACKET_RX",
          {
            "zero_rtt": "successful"
          }
        ],
        [
          429787,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "c100000001089d411472e4ba238414000000000000000d36d6708cf15e3f2c",
            "header": {
              "type": "INIT",
              "payload_length": "57",
              "packet_number": "4611686018427387904"
            }
          }
        ],
        [
          429895,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "c700000001089d411472e4ba238414000000000000000d36d6708cf15e3f2c",
            "header": {
              "type": "INIT",
              "payload_length": "57",
              "packet_number": "4611686018427387904"
            }
          }
        ],
        [
          429916,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e000000001089d411472e4ba238414000000000000000d36d6708cf15e3f2c",
            "header": {
              "type": "HSK",
              "payload_length": "40",
              "packet_number": "1"
            },
            "frames": [
              {
                "frame_type": "PADDING"
              },
              {
                "frame_type": "PING"
              }
            ]
          }
        ],
        [
          429939,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e400000001089d411472e4ba238414000000000000000d36d6708cf15e3f2c",
            "header": {
              "type": "HSK",
              "payload_length": "40",
              "packet_number": "2"
            },
            "frames": [
              {
                "frame_type": "PADDING"
              },
              {
                "frame_type": "PING"
              }
            ]
          }
        ],
        [
          450829,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "4a9d411472e4ba2384955200d82ae52d951ed7414cc4d9036b727656e7cbe8...",
            "header": {
              "type": "SHORT",
              "payload_length": "378",
              "packet_number": "0"
            },
            "frames": [
              {
                "frame_type": "STREAM"
              },
              {
                "frame_type": "ACK"
              },
              {
                "frame_type": "NEW_CONNECTION_ID"
              },
              {
                "frame_type": "CRYPTO"
              },
              {
                "frame_type": "HANDSHAKE_DONE"
              }
            ]
          }
        ],
        [
          549241,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "489d411472e4ba23847f2350e59b8816e3883c5e501a68f76648582843fe2e...",
            "header": {
              "type": "SHORT",
              "payload_length": "1334",
              "packet_number": "4"
            },
            "frames": [
              {
                "frame_type": "PADDING"
              },
              {
                "frame_type": "PING"
              }
            ]
          }
        ],
        [
          562330,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "4a9d411472e4ba2384676df0ee396903ee0f088cd4fbc3efed0800bde6ae31",
            "header": {
              "type": "SHORT",
              "payload_length": "16",
              "packet_number": "5"
            },
            "frames": [
              {
                "frame_type": "ACK"
              }
            ]
          }
        ],
        [
          657082,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "5e9d411472e4ba23849e3501e6509a0dfaaf2a240ed0ef522f350d630a2c7e...",
            "header": {
              "type": "SHORT",
              "payload_length": "1095",
              "packet_number": "6"
            },
            "frames": [
              {
                "frame_type": "STREAM"
              }
            ]
          }
        ]
      ]
    }
  ]
}

www.mostertman.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

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.
9C339C9128...	87.759	188.908
9D411472E4...	85.559	184.194

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

Packet RX

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

Handshake Done

QLog

HTTP Header

HTTP/1.1 302 Found
server: nginx
date: Thu, 12 Feb 2026 15:28:21 GMT
content-type: text/html; charset=UTF-8
set-cookie: grav-site-00c2a16=ce25faaa32d0f9802ac5a7b8247caf8e; expires=Thu, 12 Feb 2026 15:58:21 GMT; Max-Age=1800; path=/; domain=mostertman.com; secure; HttpOnly; SameSite=Lax
expires: Thu, 19 Feb 2026 15:28:21 GMT
cache-control: max-age=604800
pragma: no-cache
location: /en
alt-svc: h3=":443"; ma=86400
cross-origin-embedder-policy: credentialless
cross-origin-opener-policy: same-origin
cross-origin-resource-policy: same-origin
expect-ct: max-age=31536000, enforce
referrer-policy: same-origin
strict-transport-security: max-age=31536000; includeSubDomains; preload
x-content-type-options: nosniff
x-frame-options: SAMEORIGIN
x-ua-compatible: IE=Edge
x-xss-protection: 0
content-security-policy: default-src 'self'; script-src 'self' 'unsafe-eval' 'unsafe-inline' https://gumroad.com/js/gumroad.js https://assets.gumroad.com/packs/js/; style-src 'self' 'unsafe-inline' https://assets.gumroad.com/packs/css/; img-src 'self' data: https://www.gravatar.com https://placehold.co/50x50/; font-src 'self' data: https://assets.gumroad.com/packs/static/; frame-ancestors 'self'; base-uri 'self'; form-action 'self';
permissions-policy: accelerometer=(), autoplay=(), camera=(), encrypted-media=(), fullscreen=(), geolocation=(), gyroscope=(), magnetometer=(), microphone=(), midi=(), payment=(), picture-in-picture=(), sync-xhr=(), usb=()

Certificate Chain

Domain	mostertman.com
Issued By	E8
Expires	Tuesday, April 28, 2026 at 06:08:25 AM GMT
	This certificate is valid

Subject
Common Name	mostertman.com

Issuer
Country	US
Organization	Let's Encrypt
Common Name	E8

Serial Number	604052527209272234918589871462853301094153
Signature Algorithm	ecdsa-with-SHA384
Version

Public Key Bits	384
Public Key Type	DSA

Domain	E8
Issued By	ISRG Root X1
Expires	Friday, March 12, 2027 at 11:59:59 PM GMT

Subject
Country	US
Organization	Let's Encrypt
Common Name	E8

Issuer
Country	US
Organization	Internet Security Research Group
Common Name	ISRG Root X1

Serial Number	132370213232563105872410966929454918998
Signature Algorithm	sha256WithRSAEncryption
Version

Public Key Bits	384
Public Key Type	DSA

Domain	ISRG Root X1
Issued By	ISRG Root X1
Expires	Monday, June 04, 2035 at 11:04:38 AM GMT

Subject
Country	US
Organization	Internet Security Research Group
Common Name	ISRG Root X1

Issuer
Country	US
Organization	Internet Security Research Group
Common Name	ISRG Root X1

Serial Number	172886928669790476064670243504169061120
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": "www.mostertman.com",
  "connections": [
    {
      "qlog_version": "0.1",
      "vantagepoint": "NETWORK",
      "connectionid": "9C339C9128CCF5C4",
      "starttime": 10828521883842,
      "fields": [
        "time",
        "category",
        "type",
        "trigger",
        "data"
      ],
      "events": [
        [
          0,
          "CONNECTIVITY",
          "NEW_CONNECTION",
          "LINE",
          {
            "ip_version": "6",
            "srcip": "::",
            "dstip": "2a01:4f8:c2c:8457::1",
            "srcport": "56706",
            "dstport": "443"
          }
        ],
        [
          58,
          "CONNECTIVITY",
          "VERNEG",
          "LINE",
          {
            "proposed_version": "00000001"
          }
        ],
        [
          87759,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "c900000001089c339c9128ccf5c414000000000000000dd67f90ad47b90c73...",
            "header": {
              "type": "INIT",
              "payload_length": "1184",
              "packet_number": "0"
            },
            "frames": [
              {
                "frame_type": "ACK"
              },
              {
                "frame_type": "PADDING"
              },
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          87763,
          "CONNECTIVITY",
          "VERNEG",
          "PACKET_RX",
          {
            "agreed_version": "00000001"
          }
        ],
        [
          186896,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "c000000001089c339c9128ccf5c414000000000000000dd67f90ad47b90c73...",
            "header": {
              "type": "INIT",
              "payload_length": "203",
              "packet_number": "1"
            },
            "frames": [
              {
                "frame_type": "ACK"
              },
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          187704,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e500000001089c339c9128ccf5c414000000000000000dd67f90ad47b90c73...",
            "header": {
              "type": "HSK",
              "payload_length": "965",
              "packet_number": "0"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          187879,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e400000001089c339c9128ccf5c414000000000000000dd67f90ad47b90c73...",
            "header": {
              "type": "HSK",
              "payload_length": "1184",
              "packet_number": "1"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          188065,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e300000001089c339c9128ccf5c414000000000000000dd67f90ad47b90c73...",
            "header": {
              "type": "HSK",
              "payload_length": "433",
              "packet_number": "2"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          188182,
          "SECURITY",
          "CHECK_CERT",
          "CERTLOG",
          {
            "certificate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
          }
        ],
        [
          188182,
          "SECURITY",
          "CHECK_CERT",
          "CERTLOG",
          {
            "certificate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
          }
        ],
        [
          188908,
          "CONNECTIVITY",
          "HANDSHAKE",
          "PACKET_RX",
          {
            "status": "complete"
          }
        ],
        [
          439064,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "c100000001089c339c9128ccf5c414000000000000000dd67f90ad47b90c73",
            "header": {
              "type": "INIT",
              "payload_length": "57",
              "packet_number": "4611686018427387904"
            }
          }
        ],
        [
          439171,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "ca00000001089c339c9128ccf5c414000000000000000dd67f90ad47b90c73",
            "header": {
              "type": "INIT",
              "payload_length": "57",
              "packet_number": "4611686018427387904"
            }
          }
        ],
        [
          439189,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e400000001089c339c9128ccf5c414000000000000000dd67f90ad47b90c73",
            "header": {
              "type": "HSK",
              "payload_length": "40",
              "packet_number": "3"
            },
            "frames": [
              {
                "frame_type": "PADDING"
              },
              {
                "frame_type": "PING"
              }
            ]
          }
        ],
        [
          439288,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e100000001089c339c9128ccf5c414000000000000000dd67f90ad47b90c73",
            "header": {
              "type": "HSK",
              "payload_length": "40",
              "packet_number": "4"
            },
            "frames": [
              {
                "frame_type": "PADDING"
              },
              {
                "frame_type": "PING"
              }
            ]
          }
        ],
        [
          456474,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "4f9c339c9128ccf5c43931298746caa916fd62523146ed401ee27b35d86e7d...",
            "header": {
              "type": "SHORT",
              "payload_length": "438",
              "packet_number": "0"
            },
            "frames": [
              {
                "frame_type": "STREAM"
              },
              {
                "frame_type": "ACK"
              },
              {
                "frame_type": "NEW_CONNECTION_ID"
              },
              {
                "frame_type": "CRYPTO"
              },
              {
                "frame_type": "HANDSHAKE_DONE"
              }
            ]
          }
        ],
        [
          554265,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "519c339c9128ccf5c43507df353917416d7efaf704741c5db0c4bc96e39617...",
            "header": {
              "type": "SHORT",
              "payload_length": "1334",
              "packet_number": "4"
            },
            "frames": [
              {
                "frame_type": "PADDING"
              },
              {
                "frame_type": "PING"
              }
            ]
          }
        ],
        [
          568497,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "589c339c9128ccf5c4922891e368d28d61809109b8e54bdb8e984fc7c74daf",
            "header": {
              "type": "SHORT",
              "payload_length": "16",
              "packet_number": "5"
            },
            "frames": [
              {
                "frame_type": "ACK"
              }
            ]
          }
        ],
        [
          661253,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "5e9c339c9128ccf5c4511bc6a6a633e9098ea1dd84a4d9700466936388dc8c...",
            "header": {
              "type": "SHORT",
              "payload_length": "1094",
              "packet_number": "6"
            },
            "frames": [
              {
                "frame_type": "STREAM"
              }
            ]
          }
        ]
      ]
    },
    {
      "qlog_version": "0.1",
      "vantagepoint": "NETWORK",
      "connectionid": "9D411472E4BA2384",
      "starttime": 10828522545523,
      "fields": [
        "time",
        "category",
        "type",
        "trigger",
        "data"
      ],
      "events": [
        [
          0,
          "CONNECTIVITY",
          "NEW_CONNECTION",
          "LINE",
          {
            "ip_version": "6",
            "srcip": "::",
            "dstip": "2a01:4f8:c2c:8457::1",
            "srcport": "56706",
            "dstport": "443"
          }
        ],
        [
          33,
          "CONNECTIVITY",
          "VERNEG",
          "LINE",
          {
            "proposed_version": "00000001"
          }
        ],
        [
          85559,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "cb00000001089d411472e4ba238414000000000000000d36d6708cf15e3f2c...",
            "header": {
              "type": "INIT",
              "payload_length": "1184",
              "packet_number": "0"
            },
            "frames": [
              {
                "frame_type": "ACK"
              },
              {
                "frame_type": "PADDING"
              },
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          85563,
          "CONNECTIVITY",
          "VERNEG",
          "PACKET_RX",
          {
            "agreed_version": "00000001"
          }
        ],
        [
          183291,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "ce00000001089d411472e4ba238414000000000000000d36d6708cf15e3f2c...",
            "header": {
              "type": "INIT",
              "payload_length": "209",
              "packet_number": "1"
            },
            "frames": [
              {
                "frame_type": "ACK"
              },
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          184106,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "ea00000001089d411472e4ba238414000000000000000d36d6708cf15e3f2c...",
            "header": {
              "type": "HSK",
              "payload_length": "959",
              "packet_number": "0"
            },
            "frames": [
              {
                "frame_type": "PADDING"
              },
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          184194,
          "CONNECTIVITY",
          "HANDSHAKE",
          "PACKET_RX",
          {
            "status": "complete"
          }
        ],
        [
          184236,
          "RECOVERY",
          "RTT_UPDATE",
          "PACKET_RX",
          {
            "zero_rtt": "successful"
          }
        ],
        [
          429787,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "c100000001089d411472e4ba238414000000000000000d36d6708cf15e3f2c",
            "header": {
              "type": "INIT",
              "payload_length": "57",
              "packet_number": "4611686018427387904"
            }
          }
        ],
        [
          429895,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "c700000001089d411472e4ba238414000000000000000d36d6708cf15e3f2c",
            "header": {
              "type": "INIT",
              "payload_length": "57",
              "packet_number": "4611686018427387904"
            }
          }
        ],
        [
          429916,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e000000001089d411472e4ba238414000000000000000d36d6708cf15e3f2c",
            "header": {
              "type": "HSK",
              "payload_length": "40",
              "packet_number": "1"
            },
            "frames": [
              {
                "frame_type": "PADDING"
              },
              {
                "frame_type": "PING"
              }
            ]
          }
        ],
        [
          429939,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e400000001089d411472e4ba238414000000000000000d36d6708cf15e3f2c",
            "header": {
              "type": "HSK",
              "payload_length": "40",
              "packet_number": "2"
            },
            "frames": [
              {
                "frame_type": "PADDING"
              },
              {
                "frame_type": "PING"
              }
            ]
          }
        ],
        [
          450829,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "4a9d411472e4ba2384955200d82ae52d951ed7414cc4d9036b727656e7cbe8...",
            "header": {
              "type": "SHORT",
              "payload_length": "378",
              "packet_number": "0"
            },
            "frames": [
              {
                "frame_type": "STREAM"
              },
              {
                "frame_type": "ACK"
              },
              {
                "frame_type": "NEW_CONNECTION_ID"
              },
              {
                "frame_type": "CRYPTO"
              },
              {
                "frame_type": "HANDSHAKE_DONE"
              }
            ]
          }
        ],
        [
          549241,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "489d411472e4ba23847f2350e59b8816e3883c5e501a68f76648582843fe2e...",
            "header": {
              "type": "SHORT",
              "payload_length": "1334",
              "packet_number": "4"
            },
            "frames": [
              {
                "frame_type": "PADDING"
              },
              {
                "frame_type": "PING"
              }
            ]
          }
        ],
        [
          562330,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "4a9d411472e4ba2384676df0ee396903ee0f088cd4fbc3efed0800bde6ae31",
            "header": {
              "type": "SHORT",
              "payload_length": "16",
              "packet_number": "5"
            },
            "frames": [
              {
                "frame_type": "ACK"
              }
            ]
          }
        ],
        [
          657082,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "5e9d411472e4ba23849e3501e6509a0dfaaf2a240ed0ef522f350d630a2c7e...",
            "header": {
              "type": "SHORT",
              "payload_length": "1095",
              "packet_number": "6"
            },
            "frames": [
              {
                "frame_type": "STREAM"
              }
            ]
          }
        ]
      ]
    }
  ]
}

QUIC is supported

HTTP/3 is supported

Zero Round Trip Time Resumption (0-RTT)

QUIC Versions

Connection ID

Packet RX

Handshake Done

HTTP/3 Statistics

Zero Round Trip Time Resumption (0-RTT)

QUIC Versions

Connection ID

Packet RX

Handshake Done

QLog

www.mostertman.com

QUIC is supported

HTTP/3 is supported

Zero Round Trip Time Resumption (0-RTT)

QUIC Versions

Connection ID

Packet RX

Handshake Done

HTTP/3 Statistics

Zero Round Trip Time Resumption (0-RTT)

QUIC Versions

Connection ID

Packet RX

Handshake Done

QLog

HTTP Header

Certificate Chain

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

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.