I'm running an application hosted on Firebase and did some tests using SlowHTTPTest. For SLOW HEADERS, SLOW BODY, and SLOW READ the output is quite similar, i.e. the service is available which makes me happy. At least, I understood that my app performed well. However, for RANGE test a.k.a. Apache killer I got closed many connections. How is it possible if Firebase's server on which my app is hosted runs Nginx? What I meant is this is supposed to be Apache-related attack, but my server is not Apache. Please find below results for the attack.