I'm not sure what they are using to serve up their site, other than nginx. But they do have this header, "X-Hi-Human: The AIRBNB SRE team added this header. Co

I'm not sure what they are using to serve up their site, other than nginx. But they do have this header, "X-Hi-Human: The AIRBNB SRE team added this header. Come work with us! Email dave+header@airbnb.com"