33 import static java.util.Collections.unmodifiableList;

    33 import static java.util.Collections.unmodifiableList;

    34 import static java.util.Objects.requireNonNull;

    34 import static java.util.Objects.requireNonNull;

    35 

    35 

    36 /**

    36 /**

    37  * A read-only view of a set of HTTP headers.

    37  * A read-only view of a set of HTTP headers.

    39  *

    38  *

    40  * <p> The methods of this class ( that accept a String header name ), and the

    39  * <p> The methods of this class ( that accept a String header name ), and the

    41  * Map returned by the {@linkplain #map() map} method, operate without regard to

    40  * Map returned by the {@linkplain #map() map} method, operate without regard to

    42  * case when retrieving the header value.

    41  * case when retrieving the header value.

    43  *

    42  *