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    HTTP::Headers now special case field names that start with a
    ':'.   This is used as an escape mechanism when you need the
    header names to not go through canonicalization.  It means
    that you can force LWP to use a specific casing and even
    underscores in header names.  The ugly $TRANSLATE_UNDERSCORE
    global has been undocumented as a result of this.

#!/usr/bin/perl ---

...
print $h->as_string;
__END__
SM_USER: waldo