public static HttpHeader header(String name, String value) {
		return new HttpHeader(name, singletonList(value));
	}
public static HttpHeader header(String name, String value) {
		return new HttpHeader(name, singletonList(value));
	}
public static HttpHeader header ( String name , String value ) { return new HttpHeader ( name , singletonList ( value ) ) ; }
Create a header with a single value.

@param name Header name, must not be blank.
@param value Header value.
@return Header.
@throws NullPointerException If {@code name} or {@code value} are {@code null}.
@throws IllegalArgumentException If {@code name} is blank.
Create a header with a single value .