static void writeField(
            final MimeField field, final OutputStream out) throws IOException {
        writeBytes(stripLineBreaks(field.getName()), out);
        writeBytes(FIELD_SEP, out);
        writeBytes(stripLineBreaks(field.getBody()), out);
        writeBytes(CR_LF, out);
    }
The epilogue to be included after the multipart content.
httpclient5/src/main/java/org/apache/hc/client5/http/entity/mime/AbstractMultipartFormat.java