I am using LWP::UserAgent to send a POSt request to a remote server. 
my $type = 'post';
my $url = redacted;
my $headers = {
  'Content' => {
    'field1' => '1',
    'field2' => [{'subfield1' => 'x', 'subfield2' => 'y'}, possibly mo
+re in array],
    'field3' => {subfield3 => int, 'subfield4' => 'string'},
  },
}
my $response = $ua->$type( $url, %{$headers} );

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For testing I also added in 
$headers->{Content}->{'foo'} = ['bar', 'baz']

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I get an error back and it looks like my hash reference and array ref for field2 and field3 and passed as strings not the underlying objects so the _content string looks like The foo part parses correctly which tells me that LWP or HTTP::Request::Common POST doesn't like converting the hashes. 
"field3": "HASH(0x2308c10)"

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Obviously this isn't what I want. Now previously I had solved this by doing horrible things with strings. 
$args = {data => $args};
my @newstring;
foreach my $key (keys %{$args}) {
    foreach my $value (keys %{$args->{$key}}) {
        push @newstring, $key.'['.$value.']='.$args->{$key}->{$value};
    }
}
$args = join('&',@newstring);
my $response = $ua->post( $url, Content => $args );

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That was in a different revision of the remote server when it wanted things in a data structure variable. Essentially I was crafting my own string _content string and passing it in. The server understood it but it was a ugly way of doing it. I'm looking for a solution that doesn't involve me having to construct the string myself

In reply to LWP::UserAgent POST pass hash by Stoney2005

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