Builder removeHeader(@NonNull String name, int index) {
            List<String> header = headers.get(name);
            if (header != null) {
                if (header.size() > index) {
                    header.remove(index);
                }
            }
            if (header == null || header.isEmpty()) {
                headers.remove(name);
            }
            return this;
        }
Create a new builder for this header, the new builder will do a shallow copy of this header
part.

@return A Builder to generate a header part instance.
netbare-injector/src/main/java/com/github/megatronking/netbare/http/HttpHeaderPart.java