inets-4.7.6/src/http_util.erl contains this code:
integer_to_hexlist(Num)->
integer_to_hexlist(Num, get_size(Num), []).
Which should probably be:
integer_to_hexlist(Num) when integer(Num) ->
integer_to_hexlist(Num, get_size(Num), []).
Thank you,
Julian
ps. do not do this: http_util:integer_to_hexlist([0]).