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  1. or download this
    $ perl -MEncode -e'printf "%04X\n", ord decode "UTF-8", "\357\277\275"
    +'
    FFFD
    
  2. or download this
    $ perl -MEncode -we'print decode "UTF-8", "\215"' | od -c
    Wide character in print at -e line 1.
    0000000 357 277 275
    0000003
    
  3. or download this
    print $mech->response()->headers()->as_string();