Assertion: server blacklist | /r/HasProperty | introduced in minecraft 1.9.3 pre-2
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text: In Minecraft 1.9.3 pre-2, a server blacklist was introduced in the client which connects to Mojang's session servers to fetch a .txt file full of SHA-1 hashed domain names/IPs to see if the domain/IP you are attempting to connect to (or even ping?) matches any of these.