BodyDescriptorBuilder builder = new DefaultBodyDescriptorBuilder();
BodyDescriptor bd = builder.build();
assertEquals(-1, bd.getContentLength());
builder.addField(new RawField("Content-Length", "9901"));
bd = builder.build();
assertEquals(9901, bd.getContentLength());
// only the first content-length counts
builder.addField(new RawField("Content-Length", "1239901"));
bd = builder.build();