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

Address
Host

www.facebook.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

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.

D36CF07539... 2.358 3.24
590B2E6765... 2.339 2.467

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
vary: Accept-Encoding
set-cookie: fr=0CyVoSrCptxM6nLL5..BoUaJQ..AAA.0.0.BoUaJQ.AWe_jg37jaJzO3dKBY76XKVuKeA; expires=Mon, 15-Sep-2025 17:13:52 GMT; Max-Age=7776000; path=/; domain=.facebook.com; secure; httponly
set-cookie: sb=UKJRaNqYOn5syZtbYVNodlJE; expires=Wed, 22-Jul-2026 17:13:52 GMT; Max-Age=34560000; path=/; domain=.facebook.com; secure; httponly
reporting-endpoints: coop_report="https://www.facebook.com/browser_reporting/coop/?minimize=0", default="https://www.facebook.com/ajax/browser_error_reports/?device_level=unknown&brsid=7516967719565036446&cpp=C3&cv=1023923395&st=1750180432949", permissions_policy="https://www.facebook.com/ajax/browser_error_reports/"
report-to: {"max_age":2592000,"endpoints":[{"url":"https:\/\/www.facebook.com\/browser_reporting\/coop\/?minimize=0"}],"group":"coop_report","include_subdomains":true}, {"max_age":259200,"endpoints":[{"url":"https:\/\/www.facebook.com\/ajax\/browser_error_reports\/?device_level=unknown&brsid=7516967719565036446&cpp=C3&cv=1023923395&st=1750180432949"}]}, {"max_age":21600,"endpoints":[{"url":"https:\/\/www.facebook.com\/ajax\/browser_error_reports\/"}],"group":"permissions_policy"}
content-security-policy: default-src blob: 'self' https://*.fbsbx.com *.facebook.com *.fbcdn.net;script-src *.facebook.com *.fbcdn.net *.facebook.net 127.0.0.1:* 'nonce-SUmSXKzo' blob: 'self' connect.facebook.net 'unsafe-eval' https://*.google-analytics.com *.google.com;style-src *.fbcdn.net data: *.facebook.com 'unsafe-inline' https://fonts.googleapis.com;connect-src *.facebook.com facebook.com *.fbcdn.net *.facebook.net wss://*.facebook.com:* wss://*.whatsapp.com:* wss://*.fbcdn.net attachment.fbsbx.com ws://localhost:* blob: *.cdninstagram.com 'self' http://localhost:3103 wss://gateway.facebook.com wss://edge-chat.facebook.com wss://snaptu-d.facebook.com wss://kaios-d.facebook.com/ v.whatsapp.net *.fbsbx.com *.fb.com https://*.google-analytics.com;font-src data: *.facebook.com *.fbcdn.net *.fbsbx.com https://fonts.gstatic.com;img-src *.fbcdn.net *.facebook.com data: https://*.fbsbx.com facebook.com *.cdninstagram.com fbsbx.com fbcdn.net connect.facebook.net *.carriersignal.info blob: android-webview-video-poster: *.whatsapp.net *.fb.com *.oculuscdn.com *.tenor.co *.tenor.com *.giphy.com https://trustly.one/ https://*.trustly.one/ https://paywithmybank.com/ https://*.paywithmybank.com/ https://www.googleadservices.com https://googleads.g.doubleclick.net https://*.google-analytics.com;media-src *.cdninstagram.com blob: *.fbcdn.net *.fbsbx.com www.facebook.com *.facebook.com data: *.tenor.co *.tenor.com https://*.giphy.com;child-src data: blob: 'self' https://*.fbsbx.com *.facebook.com *.fbcdn.net;frame-src *.facebook.com *.fbsbx.com fbsbx.com data: www.instagram.com *.fbcdn.net accounts.meta.com https://trustly.one/ https://*.trustly.one/ https://paywithmybank.com/ https://*.paywithmybank.com/ https://www.googleadservices.com https://googleads.g.doubleclick.net https://www.google.com https://td.doubleclick.net *.google.com *.doubleclick.net;manifest-src data: blob: 'self' https://*.fbsbx.com *.facebook.com *.fbcdn.net;object-src data: blob: 'self' https://*.fbsbx.com *.facebook.com *.fbcdn.net;worker-src blob: *.facebook.com data:;block-all-mixed-content;upgrade-insecure-requests;
document-policy: force-load-at-top
document-policy: include-js-call-stacks-in-crash-reports
permissions-policy: accelerometer=(), attribution-reporting=(self), autoplay=(), bluetooth=(), browsing-topics=(self), camera=(self), ch-device-memory=(), ch-downlink=(), ch-dpr=(), ch-ect=(), ch-rtt=(), ch-save-data=(), ch-ua-arch=(), ch-ua-bitness=(), ch-viewport-height=(), ch-viewport-width=(), ch-width=(), clipboard-read=(self), clipboard-write=(self), compute-pressure=(), display-capture=(self), encrypted-media=(self), fullscreen=(self), gamepad=*, geolocation=(self), gyroscope=(), hid=(), idle-detection=(), interest-cohort=(self), keyboard-map=(), local-fonts=(), magnetometer=(), microphone=(self), midi=(), otp-credentials=(), payment=(), picture-in-picture=(self), private-state-token-issuance=(), publickey-credentials-get=(self), screen-wake-lock=(), serial=(), shared-storage=(), shared-storage-select-url=(), private-state-token-redemption=(), usb=(), unload=(self), window-management=(), xr-spatial-tracking=(self);report-to="permissions_policy"
cross-origin-resource-policy: same-origin
cross-origin-opener-policy: unsafe-none
pragma: no-cache
cache-control: private, no-cache, no-store, must-revalidate
expires: Sat, 01 Jan 2000 00:00:00 GMT
x-content-type-options: nosniff
x-xss-protection: 0
x-frame-options: DENY
origin-agent-cluster: ?1
strict-transport-security: max-age=15552000; preload
content-type: text/html; charset="utf-8"
x-fb-debug: +uxD/25aiLzGGyd52myCu3VPnSa9i3Z+W5z0veGRMMmSvB5FHB8aAICIAEGhmbnybTPdipmvFHsMLFeruAfrjw==
date: Tue, 17 Jun 2025 17:13:53 GMT
x-fb-connection-quality: EXCELLENT; q=0.9, rtt=1, rtx=0, c=24, mss=1232, tbw=5060, tp=8, tpl=0, uplat=191, ullat=0
alt-svc: h3=":443"; ma=86400
priority: u=3,i

Certificate Chain

Domain *.facebook.com
Issued By DigiCert SHA2 High Assurance Server CA
Expires Tuesday, June 24, 2025 at 11:59:59 PM GMT
Subject
Country US
State/Province California
Locality Menlo Park
Organization Meta Platforms, Inc.
Common Name *.facebook.com
Issuer
Country US
Organization DigiCert Inc
Unit www.digicert.com
Common Name DigiCert SHA2 High Assurance Server CA
Serial Number 2659277205574770143252902316273738170
Signature Algorithm sha256WithRSAEncryption
Version
Public Key Bits 256
Public Key Type DSA
Domain DigiCert SHA2 High Assurance Server CA
Issued By DigiCert High Assurance EV Root CA
Expires Sunday, October 22, 2028 at 12:00:00 PM GMT
Subject
Country US
Organization DigiCert Inc
Unit www.digicert.com
Common Name DigiCert SHA2 High Assurance Server CA
Issuer
Country US
Organization DigiCert Inc
Unit www.digicert.com
Common Name DigiCert High Assurance EV Root CA
Serial Number 6489877074546166222510380951761917343
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": "www.facebook.com",
  "connections": [
    {
      "qlog_version": "0.1",
      "vantagepoint": "NETWORK",
      "connectionid": "D36CF07539C06A6F",
      "starttime": 44480188423845,
      "fields": [
        "time",
        "category",
        "type",
        "trigger",
        "data"
      ],
      "events": [
        [
          0,
          "CONNECTIVITY",
          "NEW_CONNECTION",
          "LINE",
          {
            "ip_version": "6",
            "srcip": "::",
            "dstip": "2a03:2880:f35a:1:face:b00c:0:25de",
            "srcport": "48244",
            "dstport": "443"
          }
        ],
        [
          69,
          "CONNECTIVITY",
          "VERNEG",
          "LINE",
          {
            "proposed_version": "00000001"
          }
        ],
        [
          2358,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "c00000000108d36cf07539c06a6f08ad00d1050c12071d0044b6942ff1414a...",
            "header": {
              "type": "INIT",
              "payload_length": "1216",
              "packet_number": "4786868"
            },
            "frames": [
              {
                "frame_type": "ACK"
              },
              {
                "frame_type": "PADDING"
              },
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          2360,
          "CONNECTIVITY",
          "VERNEG",
          "PACKET_RX",
          {
            "agreed_version": "00000001"
          }
        ],
        [
          2583,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e80000000108d36cf07539c06a6f08ad00d1050c12071d44b7f2e25622e0f9...",
            "header": {
              "type": "HSK",
              "payload_length": "1216",
              "packet_number": "4786868"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          2728,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "ed0000000108d36cf07539c06a6f08ad00d1050c12071d44b7b2dd5b75d771...",
            "header": {
              "type": "HSK",
              "payload_length": "1216",
              "packet_number": "4786869"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          2927,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e70000000108d36cf07539c06a6f08ad00d1050c12071d433cf12440e4f054...",
            "header": {
              "type": "HSK",
              "payload_length": "837",
              "packet_number": "4786870"
            },
            "frames": [
              {
                "frame_type": "CRYPTO"
              }
            ]
          }
        ],
        [
          3088,
          "SECURITY",
          "CHECK_CERT",
          "CERTLOG",
          {
            "certificate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
          }
        ],
        [
          3088,
          "SECURITY",
          "CHECK_CERT",
          "CERTLOG",
          {
            "certificate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
          }
        ],
        [
          3240,
          "CONNECTIVITY",
          "HANDSHAKE",
          "PACKET_RX",
          {
            "status": "complete"
          }
        ],
        [
          3287,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "4dd36cf07539c06a6f1eb2cfa0e7b2561facaa7809c7bbcc1efa9331bf67de...",
            "header": {
              "type": "SHORT",
              "payload_length": "64",
              "packet_number": "4786868"
            },
            "frames": [
              {
                "frame_type": "STREAM"
              },
              {
                "frame_type": "PADDING"
              }
            ]
          }
        ],
        [
          4960,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "e70000000108d36cf07539c06a6f08ad00d1050c12071d40161d1257026691",
            "header": {
              "type": "HSK",
              "payload_length": "31",
              "packet_number": "4786871"
            },
            "frames": [
              {
                "frame_type": "ACK"
              }
            ]
          }
        ],
        [
          5016,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "4ed36cf07539c06a6fa00b5a1a8815a0ae042449bc9cebe2f653a67d67ac93...",
            "header": {
              "type": "SHORT",
              "payload_length": "96",
              "packet_number": "4786869"
            },
            "frames": [
              {
                "frame_type": "ACK"
              },
              {
                "frame_type": "PADDING"
              },
              {
                "frame_type": "NEW_TOKEN"
              },
              {
                "frame_type": "HANDSHAKE_DONE"
              }
            ]
          }
        ],
        [
          5398,
          "TRANSPORT",
          "PACKET_RX",
          "LINE",
          {
            "raw": "50d36cf07539c06a6f8c9caa62e934f9a63a1d4bf7bd47a3f2c91c3b3c2d31...",
            "header": {
              "type": "SHORT",
              "payload_length": "256",
              "packet_number": "4786870"
            },
            "frames": [
              {
                "frame_type": "PADDING"
              },
              {
                "frame_type": "CRYPTO"
              }
            ]
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}

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