3.7 library(http/http_authenticate): Authenticate HTTP connections using 401 headers
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Availability::- use_module(library(http/http_authenticate)).
Source[det]http_read_passwd_file(+Path, -Data)
Read a password file. Data is a list of terms of the format below, where User is an atom identifying the user, Hash is a string containing the salted password hash and Fields contain additional fields. The string value of each field is converted using name/2 to either a number or an atom. 
passwd(User, Hash, Fields)