HTTP/3 Check established a QUIC connection for all attempts made with the given endpoint. See the metrics below for more information.
0-RTTThe QUIC handshake for this connection was completed without any additional round-trips.
SUCCESSThese are the QUIC versions supported by this QUIC endpoint.
AGREED SUPPORTEDCID
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. |
RX
Packet RXThis 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). |
|---|---|---|
| 36C.. | 3.03 | 5.0 |
| 43E.. | 2.85 | 3.22 |
Read detailed descriptions of the items and metrics shown above.
The QUIC handshake for this connection was completed without any additional round-trips.
SUCCESSThese are the QUIC versions supported by this QUIC endpoint.
AGREED SUPPORTED
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.
This value represents the time between the first packet sent and the first packet received (measured in milliseconds).
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 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/1.1 200 OK
date: Thu, 15 Oct 2026 11:52:20 GMT
content-type: text/html; charset=utf-8
priority: u=3,i=?0
server: cloudflare
last-modified: Tue, 13 Oct 2026 22:05:48 GMT
cf-cache-status: HIT
allow: GET, HEAD
accept-ranges: bytes
age: 12496
cf-ray: a4ae9dfa3a7f14a8-EWR
alt-svc: h3=":443"; ma=86400
server-timing: cfExtPri
| Domain | example.com |
| Issued By | Cloudflare TLS Issuing ECC CA 3 |
| Expires | Friday, December 25, 2026 at 10:56:35 PM GMT |
| Subject | |
|---|---|
| Common Name | example.com |
| Issuer | |
|---|---|
| Country | US |
| Organization | SSL Corporation |
| Common Name | Cloudflare TLS Issuing ECC CA 3 |
| Serial Number | 2569673129085639595562975411803018896 |
| Signature Algorithm | ecdsa-with-SHA256 |
| Version |
| Public Key Bits | 256 |
| Public Key Type | DSA |
| Domain | Cloudflare TLS Issuing ECC CA 3 |
| Issued By | SSL.com TLS Transit ECC CA R2 |
| Expires | Sunday, May 27, 2035 at 07:49:44 PM GMT |
| Subject | |
|---|---|
| Country | US |
| Organization | SSL Corporation |
| Common Name | Cloudflare TLS Issuing ECC CA 3 |
| Issuer | |
|---|---|
| Country | US |
| Organization | SSL Corporation |
| Common Name | SSL.com TLS Transit ECC CA R2 |
| Serial Number | 66372654976151554372298637577872710439 |
| Signature Algorithm | ecdsa-with-SHA384 |
| Version |
| Public Key Bits | 256 |
| Public Key Type | DSA |
| Domain | SSL.com TLS Transit ECC CA R2 |
| Issued By | SSL.com TLS ECC Root CA 2022 |
| Expires | Saturday, October 17, 2037 at 05:02:22 PM GMT |
| Subject | |
|---|---|
| Country | US |
| Organization | SSL Corporation |
| Common Name | SSL.com TLS Transit ECC CA R2 |
| Issuer | |
|---|---|
| Country | US |
| Organization | SSL Corporation |
| Common Name | SSL.com TLS ECC Root CA 2022 |
| Serial Number | 128008513138955688728541566246916480814 |
| Signature Algorithm | ecdsa-with-SHA384 |
| Version |
| Public Key Bits | 384 |
| Public Key Type | DSA |
| Domain | SSL.com TLS ECC Root CA 2022 |
| Issued By | AAA Certificate Services |
| Expires | Sunday, December 31, 2028 at 11:59:59 PM GMT |
| Subject | |
|---|---|
| Country | US |
| Organization | SSL Corporation |
| Common Name | SSL.com TLS ECC Root CA 2022 |
| Issuer | |
|---|---|
| Country | GB |
| State/Province | Greater Manchester |
| Locality | Salford |
| Organization | Comodo CA Limited |
| Common Name | AAA Certificate Services |
| Serial Number | 30893078736679610946431741896244126862 |
| Signature Algorithm | sha256WithRSAEncryption |
| Version |
| Public Key Bits | 384 |
| Public Key Type | DSA |
{
"qlog_version": "0.1",
"description": "example.com",
"connections": [
{
"qlog_version": "0.1",
"vantagepoint": "NETWORK",
"connectionid": "36CC9F597E84B95E",
"starttime": 6589173906084,
"fields": [
"time",
"category",
"type",
"trigger",
"data"
],
"events": [
[
0,
"CONNECTIVITY",
"NEW_CONNECTION",
"LINE",
{
"ip_version": "6",
"srcip": "::",
"dstip": "2606:4700:10::ac42:93f3",
"srcport": "53129",
"dstport": "443"
}
],
[
154,
"CONNECTIVITY",
"VERNEG",
"LINE",
{
"proposed_version": "00000001"
}
],
[
3030,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "c7000000010836cc9f597e84b95e1401bc855cda853dfc8abf6b5cef86fcfc...",
"header": {
"type": "INIT",
"payload_length": "138",
"packet_number": "0"
},
"frames": [
{
"frame_type": "ACK"
},
{
"frame_type": "CRYPTO"
}
]
}
],
[
3034,
"CONNECTIVITY",
"VERNEG",
"PACKET_RX",
{
"agreed_version": "00000001"
}
],
[
3533,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "e5000000010836cc9f597e84b95e1401bc855cda853dfc8abf6b5cef86fcfc...",
"header": {
"type": "HSK",
"payload_length": "1184",
"packet_number": "1"
},
"frames": [
{
"frame_type": "CRYPTO"
}
]
}
],
[
3905,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "e5000000010836cc9f597e84b95e1401bc855cda853dfc8abf6b5cef86fcfc...",
"header": {
"type": "HSK",
"payload_length": "1184",
"packet_number": "2"
},
"frames": [
{
"frame_type": "CRYPTO"
}
]
}
],
[
4136,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "ee000000010836cc9f597e84b95e1401bc855cda853dfc8abf6b5cef86fcfc...",
"header": {
"type": "HSK",
"payload_length": "1184",
"packet_number": "3"
},
"frames": [
{
"frame_type": "CRYPTO"
}
]
}
],
[
4479,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "eb000000010836cc9f597e84b95e1401bc855cda853dfc8abf6b5cef86fcfc...",
"header": {
"type": "HSK",
"payload_length": "532",
"packet_number": "4"
},
"frames": [
{
"frame_type": "CRYPTO"
}
]
}
],
[
4752,
"SECURITY",
"CHECK_CERT",
"CERTLOG",
{
"certificate": "308203E63082038DA003020102021001EEE6AABB521D5E14FC315FD9985690300A06082A8648CE3D0403023051310B300906035504061302555331183016060355040A0C0F53534C20436F72706F726174696F6E3128302606035504030C1F436C6F7564666C61726520544C532049737375696E67204543432043412033301E170D3236303932363232343931315A170D3236313232353232353633355A30163114301206035504030C0B6578616D706C652E636F6D3059301306072A8648CE3D020106082A8648CE3D030107034200046A69D1315B3C532784B72D2CCA2330007B2174F6AD10B741745E62E2662689483D1240F8552B7EA950A94CE794D4B2D267AD4EDFFBB7A51349191122B3CDC6EDA38202803082027C300C0603551D130101FF04023000301F0603551D230418301680148303FDE7F6F54A4D1541F4ED2216D3320A3ECA66306C06082B060105050701010460305E303906082B06010505073002862D687474703A2F2F692E63662D692E73736C2E636F6D2F436C6F7564666C6172652D544C532D492D45332E636572302106082B060105050730018615687474703A2F2F6F2E63662D692E73736C2E636F6D30250603551D11041E301C820B6578616D706C652E636F6D820D2A2E6578616D706C652E636F6D30230603551D20041C301A3008060667810C010201300E060C2B0601040182A9300103010130130603551D25040C300A06082B0601050507030130530603551D1F044C304A3048A046A0448642687474703A2F2F632E63662D692E73736C2E636F6D2F616538303165643163353562623537396437393230386230643737326163666238636333613230382E63726C300E0603551D0F0101FF040403020780300F06092B0601040182DA4B2C0402050030820104060A2B06010401D6790204020481F50481F200F0007600944E4387FAECC1EF81F3192426A8186501C7D35F3802013F72677D55372E19D8000001A0DFF1AD620000040300473045022100AE0946A145ACF039CAA3DC0EFBCBC7977500692E51828EFF43FF1BD77775FB8402206DCD0A312F8CB00358E562C6A478139375319348355564D007BF2F6113206B51007600CB38F715897C84A1445F5BC1DDFBC96EF29A59CD470A690585B0CB14C31458E7000001A0DFF1AD7E000004030047304502201D9837F9593FA79204CB55D014EB183ECA4B2295BBF8BAF19CDAF7B962F7A15C022100D66B6F4E733CCDB34A8FA02B5295A68134544430E0382E11D42D96E5C48AE9F2300A06082A8648CE3D04030203470030440220346957C562D34EA9F9F9740E90FD3A7D381A11B8C33001D420B9886A9C7C8B9B0220079323FC6969F199341F47C0D7C4794D39CA1F9A4AFF79A43F1236D20058DAF4"
}
],
[
4752,
"SECURITY",
"CHECK_CERT",
"CERTLOG",
{
"certificate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
}
],
[
4752,
"SECURITY",
"CHECK_CERT",
"CERTLOG",
{
"certificate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
}
],
[
4752,
"SECURITY",
"CHECK_CERT",
"CERTLOG",
{
"certificate": "3082043E30820326A0030201020210173DCA60EA9F8E1026DAFCD72810E48E300D06092A864886F70D01010B0500307B310B3009060355040613024742311B301906035504080C1247726561746572204D616E636865737465723110300E06035504070C0753616C666F7264311A3018060355040A0C11436F6D6F646F204341204C696D697465643121301F06035504030C18414141204365727469666963617465205365727669636573301E170D3235303830313030303030305A170D3238313233313233353935395A304E310B300906035504061302555331183016060355040A0C0F53534C20436F72706F726174696F6E3125302306035504030C1C53534C2E636F6D20544C532045434320526F6F7420434120323032323076301006072A8648CE3D020106052B810400220362000445293573FAC2B823CE147DA8B14DA05B36EE2A2C53C3600935B224662669C0B395D65D9240190EC6A51370F4EF1251285DE7CCBDF93C85C1CF9490C92BCE9242585967FD942710648C4F04B14D49E47B4F9BF5E708F80388F7A7C3924B195481A382019730820193301F0603551D23041830168014A0110A233E96F107ECE2AF29EF82A57FD030A4B4301D0603551D0E04160414898F2FA3E82BA014547BF356B8265F67380B9CD0300E0603551D0F0101FF04040302018630120603551D130101FF040830060101FF020102301D0603551D250416301406082B0601050507030106082B060105050703023081920603551D2004818A3081873007060567810C01013008060667810C0102013008060667810C0102023008060667810C010203300E060C2B0601040182A93001030101300E060C2B0601040182A93001030102300E060C2B0601040182A93001030103300E060C2B0601040182A93001030104300E060C2B0601040182A93001030105300E060C2B0601040182A9300103010630430603551D1F043C303A3038A036A0348632687474703A2F2F63726C2E636F6D6F646F63612E636F6D2F414141436572746966696361746553657276696365732E63726C303406082B0601050507010104283026302406082B060105050730018618687474703A2F2F6F6373702E636F6D6F646F63612E636F6D300D06092A864886F70D01010B0500038201010043E570FB4BEE243CF0382886CBDE46C32B2B9C605800575B6BE8D04E45D8BE42561AD203D717F252129FF2D66EA70511A643A8541FBD66FB11D79059F0E499AD1C3C521DF6433E9B61A95EDCF67CD22CC08650304964743C3ECC431314C58F5BD86B02BD26FCCF55E02717CCA194914424D58160E1B9AED607630176D37E03CF33A17758FCF8559E8C743596CCC57742496736CA88D410EDC0C1C1847132FDF88D70E80F3DA27350D1229F197B3F5F3E946A34FC9B4807D41B5D5146EEAF7681DFE9F4CC9FD4EEEDF90CA886BF99A6346F3595D66B5A30532754FD7F15485A699B4D5CD9BF280D32D52E992B390DE9658E1949022740B1373EE62081266A9116"
}
],
[
4995,
"CONNECTIVITY",
"HANDSHAKE",
"PACKET_RX",
{
"status": "complete"
}
],
[
5592,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "c8000000010836cc9f597e84b95e1401bc855cda853dfc8abf6b5cef86fcfc",
"header": {
"type": "INIT",
"payload_length": "60",
"packet_number": "4611686018427387904"
}
}
],
[
7684,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "4636cc9f597e84b95ebc9a66d8de3fe6954c8f5eac00f314db489cde4222df...",
"header": {
"type": "SHORT",
"payload_length": "456",
"packet_number": "6"
},
"frames": [
{
"frame_type": "ACK"
},
{
"frame_type": "NEW_CONNECTION_ID"
},
{
"frame_type": "CRYPTO"
},
{
"frame_type": "HANDSHAKE_DONE"
}
]
}
],
[
7771,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "4236cc9f597e84b95ef1ffcd61039da8bbf2d267f47a98512ce7ca1fcac40d",
"header": {
"type": "SHORT",
"payload_length": "39",
"packet_number": "7"
},
"frames": [
{
"frame_type": "STREAM"
}
]
}
],
[
8028,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "4e36cc9f597e84b95e9d0aaf0946128bfd402713627c90ad0b60eefeb83bd0",
"header": {
"type": "SHORT",
"payload_length": "16",
"packet_number": "8"
},
"frames": [
{
"frame_type": "STREAM"
}
]
}
],
[
8072,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "4736cc9f597e84b95e13b9da14737ccfeb663386e6315730d017771f63b1c0",
"header": {
"type": "SHORT",
"payload_length": "16",
"packet_number": "9"
},
"frames": [
{
"frame_type": "STREAM"
}
]
}
],
[
10130,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "4036cc9f597e84b95e384fbb0853789099391c21ac1644b3099248a0cab692",
"header": {
"type": "SHORT",
"payload_length": "15",
"packet_number": "10"
},
"frames": [
{
"frame_type": "ACK"
}
]
}
],
[
13551,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "5136cc9f597e84b95edfd49998bb7d68a53523837ac748199c7bc1b83c629d...",
"header": {
"type": "SHORT",
"payload_length": "230",
"packet_number": "11"
},
"frames": [
{
"frame_type": "STREAM"
}
]
}
]
]
},
{
"qlog_version": "0.1",
"vantagepoint": "NETWORK",
"connectionid": "43EFB69A4C955D48",
"starttime": 6589173920313,
"fields": [
"time",
"category",
"type",
"trigger",
"data"
],
"events": [
[
0,
"CONNECTIVITY",
"NEW_CONNECTION",
"LINE",
{
"ip_version": "6",
"srcip": "::",
"dstip": "2606:4700:10::ac42:93f3",
"srcport": "53129",
"dstport": "443"
}
],
[
138,
"CONNECTIVITY",
"VERNEG",
"LINE",
{
"proposed_version": "00000001"
}
],
[
2853,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "c0000000010843efb69a4c955d48140109e177b5ab5314c80a0f7780a89214...",
"header": {
"type": "INIT",
"payload_length": "144",
"packet_number": "0"
},
"frames": [
{
"frame_type": "ACK"
},
{
"frame_type": "CRYPTO"
}
]
}
],
[
2855,
"CONNECTIVITY",
"VERNEG",
"PACKET_RX",
{
"agreed_version": "00000001"
}
],
[
3152,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "e5000000010843efb69a4c955d48140109e177b5ab5314c80a0f7780a89214...",
"header": {
"type": "HSK",
"payload_length": "188",
"packet_number": "1"
},
"frames": [
{
"frame_type": "CRYPTO"
}
]
}
],
[
3216,
"CONNECTIVITY",
"HANDSHAKE",
"PACKET_RX",
{
"status": "complete"
}
],
[
3242,
"RECOVERY",
"RTT_UPDATE",
"PACKET_RX",
{
"zero_rtt": "successful"
}
],
[
5601,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "5f43efb69a4c955d48de6678301fc0d0649a9f3afe755a67aeb04624ec280c...",
"header": {
"type": "SHORT",
"payload_length": "456",
"packet_number": "2"
},
"frames": [
{
"frame_type": "ACK"
},
{
"frame_type": "NEW_CONNECTION_ID"
},
{
"frame_type": "CRYPTO"
},
{
"frame_type": "HANDSHAKE_DONE"
}
]
}
],
[
5974,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "5443efb69a4c955d480396f54806d8256776526379afc9896e134bb5f61c4d",
"header": {
"type": "SHORT",
"payload_length": "39",
"packet_number": "3"
},
"frames": [
{
"frame_type": "STREAM"
}
]
}
],
[
6109,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "4843efb69a4c955d48ab67ed0aa51939558a3b9e14b9365e516346bc05d5b7",
"header": {
"type": "SHORT",
"payload_length": "16",
"packet_number": "4"
},
"frames": [
{
"frame_type": "STREAM"
}
]
}
],
[
6140,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "4e43efb69a4c955d48d05d74b2ffebbc957d0fbdf650896535ee27fbf351cc",
"header": {
"type": "SHORT",
"payload_length": "16",
"packet_number": "5"
},
"frames": [
{
"frame_type": "STREAM"
}
]
}
],
[
8265,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "4043efb69a4c955d48eeeef252bc1ec471e3d89cac4ac299aa511f99715e2a",
"header": {
"type": "SHORT",
"payload_length": "15",
"packet_number": "6"
},
"frames": [
{
"frame_type": "ACK"
}
]
}
],
[
11430,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "4e43efb69a4c955d48f0af84c295d6809a6a1762151e303df43d92356f11be...",
"header": {
"type": "SHORT",
"payload_length": "230",
"packet_number": "7"
},
"frames": [
{
"frame_type": "STREAM"
}
]
}
]
]
}
]
}
QLog is a standard under development for QUIC Connection debugging and visualization. Learn more at https://quic.edm.uhasselt.be/HTTP/3 Check established a QUIC connection for all attempts made with the given endpoint. See the metrics below for more information.
0-RTTThe QUIC handshake for this connection was completed without any additional round-trips.
SUCCESSThese are the QUIC versions supported by this QUIC endpoint.
AGREED SUPPORTEDConnection 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. |
Packet RX
Packet RXThis 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). |
|---|---|---|
| 36CC9F597E... | 3.03 | 4.995 |
| 43EFB69A4C... | 2.853 | 3.216 |
Read detailed descriptions of the items and metrics shown above.
The QUIC handshake for this connection was completed without any additional round-trips.
SUCCESSThese are the QUIC versions supported by this QUIC endpoint.
AGREED SUPPORTED
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.
This value represents the time between the first packet sent and the first packet received (measured in milliseconds).
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 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/1.1 200 OK
date: Thu, 15 Oct 2026 11:52:20 GMT
content-type: text/html; charset=utf-8
priority: u=3,i=?0
server: cloudflare
last-modified: Tue, 13 Oct 2026 22:05:48 GMT
cf-cache-status: HIT
allow: GET, HEAD
accept-ranges: bytes
age: 12496
cf-ray: a4ae9dfa3a7f14a8-EWR
alt-svc: h3=":443"; ma=86400
server-timing: cfExtPri
| Domain | example.com |
| Issued By | Cloudflare TLS Issuing ECC CA 3 |
| Expires | Friday, December 25, 2026 at 10:56:35 PM GMT |
| Subject | |
|---|---|
| Common Name | example.com |
| Issuer | |
|---|---|
| Country | US |
| Organization | SSL Corporation |
| Common Name | Cloudflare TLS Issuing ECC CA 3 |
| Serial Number | 2569673129085639595562975411803018896 |
| Signature Algorithm | ecdsa-with-SHA256 |
| Version |
| Public Key Bits | 256 |
| Public Key Type | DSA |
| Domain | Cloudflare TLS Issuing ECC CA 3 |
| Issued By | SSL.com TLS Transit ECC CA R2 |
| Expires | Sunday, May 27, 2035 at 07:49:44 PM GMT |
| Subject | |
|---|---|
| Country | US |
| Organization | SSL Corporation |
| Common Name | Cloudflare TLS Issuing ECC CA 3 |
| Issuer | |
|---|---|
| Country | US |
| Organization | SSL Corporation |
| Common Name | SSL.com TLS Transit ECC CA R2 |
| Serial Number | 66372654976151554372298637577872710439 |
| Signature Algorithm | ecdsa-with-SHA384 |
| Version |
| Public Key Bits | 256 |
| Public Key Type | DSA |
| Domain | SSL.com TLS Transit ECC CA R2 |
| Issued By | SSL.com TLS ECC Root CA 2022 |
| Expires | Saturday, October 17, 2037 at 05:02:22 PM GMT |
| Subject | |
|---|---|
| Country | US |
| Organization | SSL Corporation |
| Common Name | SSL.com TLS Transit ECC CA R2 |
| Issuer | |
|---|---|
| Country | US |
| Organization | SSL Corporation |
| Common Name | SSL.com TLS ECC Root CA 2022 |
| Serial Number | 128008513138955688728541566246916480814 |
| Signature Algorithm | ecdsa-with-SHA384 |
| Version |
| Public Key Bits | 384 |
| Public Key Type | DSA |
| Domain | SSL.com TLS ECC Root CA 2022 |
| Issued By | AAA Certificate Services |
| Expires | Sunday, December 31, 2028 at 11:59:59 PM GMT |
| Subject | |
|---|---|
| Country | US |
| Organization | SSL Corporation |
| Common Name | SSL.com TLS ECC Root CA 2022 |
| Issuer | |
|---|---|
| Country | GB |
| State/Province | Greater Manchester |
| Locality | Salford |
| Organization | Comodo CA Limited |
| Common Name | AAA Certificate Services |
| Serial Number | 30893078736679610946431741896244126862 |
| Signature Algorithm | sha256WithRSAEncryption |
| Version |
| Public Key Bits | 384 |
| Public Key Type | DSA |
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": "example.com",
"connections": [
{
"qlog_version": "0.1",
"vantagepoint": "NETWORK",
"connectionid": "36CC9F597E84B95E",
"starttime": 6589173906084,
"fields": [
"time",
"category",
"type",
"trigger",
"data"
],
"events": [
[
0,
"CONNECTIVITY",
"NEW_CONNECTION",
"LINE",
{
"ip_version": "6",
"srcip": "::",
"dstip": "2606:4700:10::ac42:93f3",
"srcport": "53129",
"dstport": "443"
}
],
[
154,
"CONNECTIVITY",
"VERNEG",
"LINE",
{
"proposed_version": "00000001"
}
],
[
3030,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "c7000000010836cc9f597e84b95e1401bc855cda853dfc8abf6b5cef86fcfc...",
"header": {
"type": "INIT",
"payload_length": "138",
"packet_number": "0"
},
"frames": [
{
"frame_type": "ACK"
},
{
"frame_type": "CRYPTO"
}
]
}
],
[
3034,
"CONNECTIVITY",
"VERNEG",
"PACKET_RX",
{
"agreed_version": "00000001"
}
],
[
3533,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "e5000000010836cc9f597e84b95e1401bc855cda853dfc8abf6b5cef86fcfc...",
"header": {
"type": "HSK",
"payload_length": "1184",
"packet_number": "1"
},
"frames": [
{
"frame_type": "CRYPTO"
}
]
}
],
[
3905,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "e5000000010836cc9f597e84b95e1401bc855cda853dfc8abf6b5cef86fcfc...",
"header": {
"type": "HSK",
"payload_length": "1184",
"packet_number": "2"
},
"frames": [
{
"frame_type": "CRYPTO"
}
]
}
],
[
4136,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "ee000000010836cc9f597e84b95e1401bc855cda853dfc8abf6b5cef86fcfc...",
"header": {
"type": "HSK",
"payload_length": "1184",
"packet_number": "3"
},
"frames": [
{
"frame_type": "CRYPTO"
}
]
}
],
[
4479,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "eb000000010836cc9f597e84b95e1401bc855cda853dfc8abf6b5cef86fcfc...",
"header": {
"type": "HSK",
"payload_length": "532",
"packet_number": "4"
},
"frames": [
{
"frame_type": "CRYPTO"
}
]
}
],
[
4752,
"SECURITY",
"CHECK_CERT",
"CERTLOG",
{
"certificate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
}
],
[
4752,
"SECURITY",
"CHECK_CERT",
"CERTLOG",
{
"certificate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
}
],
[
4752,
"SECURITY",
"CHECK_CERT",
"CERTLOG",
{
"certificate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
}
],
[
4752,
"SECURITY",
"CHECK_CERT",
"CERTLOG",
{
"certificate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
}
],
[
4995,
"CONNECTIVITY",
"HANDSHAKE",
"PACKET_RX",
{
"status": "complete"
}
],
[
5592,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "c8000000010836cc9f597e84b95e1401bc855cda853dfc8abf6b5cef86fcfc",
"header": {
"type": "INIT",
"payload_length": "60",
"packet_number": "4611686018427387904"
}
}
],
[
7684,
"TRANSPORT",
"PACKET_RX",
"LINE",
{
"raw": "4636cc9f597e84b95ebc9a66d8de3fe6954c8f5eac00f314db489cde4222df...",
"header": {
"type": "SHORT",
"payload_length": "456",
"packet_number": "6"
},
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