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$ cat ch12.txt | xxd -r -p
s��i��Z��`�@&S`*����� A�B3�tP��}����▒�Ϡ
        >i��~�GET / HTTP/1.1
Authorization: Basic Y29uZmk6ZGVudGlhbA==
User-Agent: InsaneBrowser
Host: www.myipv6.org
Accept: */*

Authorization: Basic Y29uZmk6ZGVudGlhbA==

$ base64 --help
Usage: base64 [OPTION]... [FILE]
Base64 encode or decode FILE, or standard input, to standard output.
 
With no FILE, or when FILE is -, read standard input.
 
Mandatory arguments to long options are mandatory for short options too.
  -d, --decode
         decode data
 
$ echo "Y29uZmk6ZGVudGlhbA==" | base64 --decode -
confi:dential

Authorization: Basic dXNlcnRlc3Q6cGFzc3dvcmQ=
usertest:password

Request 71 –> Reply 72