X-FB-Debug

HTTP response header

X-FB-Debug header contains a unique value that is used by Facebook to track issues and connect a submitted issue with a specific response.

Header usage statistics

X-FB-Debug response header information and usage statistics.

Websites using header X-FB-Debug 635
Percentage of websites that use X-FB-Debug header <0.1%
Total discovered header values 635
Header uses directives No
Header values are unique or random Yes
Most popular in the country Ireland

Distribution by websites popularity

X-FB-Debug detection in the top websites by popularity

Top 10k sites 50 websites
Top 100k sites 100 websites
Top 1m sites 174 websites

Websites utilizing X-FB-Debug

List of websites that use X-FB-Debug header

Domain Country Rank Contacts
facebook.com Ireland 2
m.facebook.com Ireland 40
fb.com Ireland 89
messenger.com Ireland 96
www.messenger.com Ireland 96
www.facebook.com United States of America 22,750
See full domain list

Geographical Distribution

Header usage distribution by websites across the globe.






Common header values

List of top common X-FB-Debug header values

Header value Value prevalence
/9G5ujd4mU8AepBjydGejGGacATD88WCWOsmMioPUtpbzSPwyi0OjMJziO+oyHi8Txuc76RnOAAqP+qEn8sZgg== 0.16%
/adjTbwgfndaQnLhUI4r7B5A1ZJcWbQVM6+RQgP7v4hnYPjeeldJ8vTE55plF4+8Thyv4acWM8xI+XXddxgp0w== 0.16%
/JWPRalSXkCJpMjPT3XSpX3/FqscWk40luNtF0c1PeubBBktItr+rj73w7O8dPnW9wS7E//VLip6JgLaLqIinw== 0.16%
/wV64eKxTj87QGFDsNL6xhwKSmoFgE4NFZoHsQpx517glBZbueBIWIvSOXdL4qhyBzTiDjCwHUbjSKqxkxpDew== 0.16%
/yR1fFoFGGjAaDmaEB1xmtIvZzeBrRZyIUCHup0a5LutjNzMllRk6gA5gYain+CbinBcyM9BMR6GaudENlBwJQ== 0.16%
+7DhRNhbnoY6C12JiKOS9kpfgN+pZnIXhbAD8taOzmXbmCp7DGNgzvm39+mPDHLOZdYFNN+8vE6Nj43QpM6H+g== 0.16%
+855f17DhLhY7zI5zNw6uQxdddDLSwllrTQpTuphzkVno67GBAxm5Ds6JeZTY5Dd/XoFI16iHHxsJW+9lpll4g== 0.16%
+ABZ2T36pkcFPLGvzTRbSX+jJRlbZqu/BdHUsK8UQXhCJ3fgmLRO2xSc7zWIAm6RFtz2s6rvG7CUZfVEh1Dw0A== 0.16%
+GGXYolJUcUO52e2vkmIOY8+2HiujSpmOcCEglMFStu+HIbFl7NUXo4dxQ0nyc16q12qunBND/6sAemFzx2L9Q== 0.16%
+kPcpsAs/dsluHRG6Gv8NgMdp9XpgeNYu7LQRf2fEEbNU3q1Y8kf3X23jsi8XLpM3hqDenkgInPZcnMUJZdo3A== 0.16%
+kVIzV7JN9QAN0ucmFKdKZu9Hskkp+1UIg8divRoAGrnfqPLolOQIc/6edMw8qkfZwFqgrjyMr5twPyVlT8Lsw== 0.16%
+PUnpC4a8O1xXHwLcg1IvbFrtVStnfZkqphGLk2tNSX9PN1GLsO8+F6fuiUdPdJpYYdTazQoSEVOCv9CGQRpsQ== 0.16%
+rp88Br+JAL6CJ5zUWn6/y71ipHGKZ+3dG6uoeqTjAU3XiXhcy+5VKM2BC+UDO/nDTSQCqRh+8ZD8E1dcHJz/g== 0.16%
+vn1DYdDQiWWo49DgCIPCOSGGp6Y88b8olHm0WOMJUQ3jyoACvyr0FcEqljRFLvxwJzLprLw6YY9nUriJhHiIQ== 0.16%
+VoC4yp3NaukSGLPIr0G39CoVP4xVby2t1RFUsaUVJ06aS9DHwkBx4t28YbIAG3UUZhLnvdZ658VKQUU9kJ61w== 0.16%
0airyOUSPF6Sl8HjHX1fKePmYUyRDAUzT8kn59jlyW4O41ugKFfXKyKfB4zO/s7iN+ZxxfdAMqjJjH2Zl5PElg== 0.16%
0H8qoV6NqnFI/B/ItxE0Y3pZNfwAslJMpF3PONlzBp4VbtI8A0DZOS40Qztf0G2MvCx1eemHHaW+hAdSj50IUQ== 0.16%
0iA6XzW47CkfWiaAo9jJ9SgFMluDkwsEaxkj1KLQU3e/NjGTMsOUqAVKg2muAfHMfLih+iBjkWOztq6jXIvV1g== 0.16%
0p4nh9LgBC53kas05OstAVPuCVXsa7heFvDcVUE0nwWzzDslNjAl8Tz9y4cbYb7GGskKNzV2HR4BKBr5sUuNCg== 0.16%
0PC00dWwE5iO2/dKbqv2SRpX9/mBa0+m4XKrUK5yOc8Kd8KOlo/SU6OeCmV04dum5oCZkf9f0F/f7JsT8Kt9Kw== 0.16%