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There is a newer version: 7.9.0

{{#-first}}
        let boundary = swagger::multipart::related::generate_boundary();
        let mut body_parts = vec![];

{{/-first}}
{{#required}}
        {
{{/required}}
{{^required}}
        if let Some({{{paramName}}}) = param_{{{paramName}}} {
{{/required}}
            let part = Node::Part(Part {
                headers: {
                    let mut h = Headers::new();
                    h.set(ContentType("{{{contentType}}}".parse().unwrap()));
                    h.set_raw("Content-ID", vec![b"{{{baseName}}}".to_vec()]);
                    h
                },
                {{#isBinary}}
                body: {{#required}}param_{{/required}}{{{paramName}}}.0,
                {{/isBinary}}
                {{^isBinary}}
                body: serde_json::to_string(&{{{paramName}}})
                    .expect("Impossible to fail to serialize")
                    .into_bytes(),
                {{/isBinary}}
            });
            body_parts.push(part);
        }
{{#-last}}

        // Write the body into a vec.
        // RFC 13341 Section 7.2.1 suggests that the body should begin with a
        // CRLF prior to the first boundary. The mime_multipart library doesn't
        // do this, so we do it instead.
        let mut body: Vec = vec![b'\r', b'\n'];
        write_multipart(&mut body, &boundary, &body_parts)
            .expect("Failed to write multipart body");
{{/-last}}