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--auth-header K:V HTTP header (repeatable)
，这一点在line 下載中也有详细论述
Дания захотела отказать в убежище украинцам призывного возраста09:44
The latter is the more interesting test — it writes a 0xcc byte (the x86-64 software breakpoint instruction) which will cause the kernel to deliver a SIGTRAP to our process if executed. This is literally changing the executable code of libc. So the next time we call getchar, if we get a SIGTRAP, we know that the write has succeeded.