For starters, that syntax doesn't match any of the documented calling conventions:
POST $url
POST $url, Header => Value,...
POST $url, $form_ref, Header => Value,...
POST $url, Header => Value,..., Content => $form_ref
POST $url, Header => Value,..., Content => $content
You want
my $attributes = { name => "test.txt", parent => { id => 0 }};
$ua->post(ENDPOINT,
Content_Type => 'form-data',
Authorization => "Bearer $token",
Content => [
attributes => encode_json($attributes),
file => [ "test.txt" ],
],
);
Use the following if you don't want to read from disk:
[ undef, "test.txt", Content => $file_contents ]
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Are you posting in the right place? Check out Where do I post X? to know for sure.
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
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Want more info? How to link
or How to display code and escape characters
are good places to start.