Asciidoctor issue with snippet (1.0.4)

I have a strange problem that I don't understand. When I use asciidoctor (v1.4) to parse a file containing the include:: directive with a tag defined, that works very well on the command line

ex : asciidoctor index.txt

where index.txt =

include::file1.ad[tags=snippetCompanion]

and by example

file : file1.ad -->

############
This is a test

// tag::snippetCompanion[]
Hello from Snippet
// end::snippetCompanion[]
###########

But if I would like to process this file using Ruby code -->

Asciidoctor.render_file(f, options)

where f = index.txt

The rendering is done but the HTML generated does not include only the snippet tag BUT all the text. I have started to debug and confirm that my snippet tag is discovered and preprocessed (reader.rb class) . But why the HTML rendered contains the text outside of the snippet tag is until now a mystery for me. If someone could help me, that should be nice

Regards,

Problem solved. Find my mistake.

Set the safe mode to 'server' or less, right?

-Dan