NettyMutableHttpResponse should support getCookies

http-netty/src/main/java/io/micronaut/http/netty/NettyMutableHttpResponse.java

@@ -34,7 +34,9 @@
 import io.micronaut.http.MutableHttpResponse;
 import io.micronaut.http.body.MessageBodyWriter;
 import io.micronaut.http.cookie.Cookie;
+import io.micronaut.http.cookie.Cookies;
 import io.micronaut.http.cookie.ServerCookieEncoder;
+import io.micronaut.http.netty.cookies.NettyCookies;
 import io.micronaut.http.netty.stream.DefaultStreamedHttpResponse;
 import io.micronaut.http.netty.stream.StreamedHttpResponse;
 import io.netty.buffer.ByteBuf;
@@ -50,6 +52,7 @@
 import io.netty.handler.codec.http.HttpResponse;
 import io.netty.handler.codec.http.HttpResponseStatus;
 import io.netty.handler.codec.http.HttpVersion;
+
 import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
@@ -267,6 +270,16 @@ public MutableHttpResponse<B> cookies(Set<Cookie> cookies) {
         return this;
     }
 
+    @Override
+    public Cookies getCookies() {
+        return new NettyCookies(nettyHeaders, conversionService);
+    }
+
+    @Override
+    public Optional<Cookie> getCookie(String name) {
+        return getCookies().findCookie(name);
+    }
+
     @Override
     public Optional<B> getBody() {
         return (Optional) optionalBody;

http-server-netty/src/test/groovy/io/micronaut/http/server/netty/binding/NettyHttpResponseSpec.groovy

@@ -62,6 +62,9 @@ class NettyHttpResponseSpec extends Specification {
         expect:
         response.status == HttpStatus."$status"
         response.headers.get(header) == value
+        response.getCookies().size() == 1
+        response.getCookies().get("foo").value == "bar"
+        response.getCookie("foo").get().value == "bar"
 
         where:
         status        | header                 | value

http/src/main/java/io/micronaut/http/HttpResponse.java

@@ -426,7 +426,7 @@ default Cookies getCookies() {
      * @return The Cookie
      */
     default Optional<Cookie> getCookie(String name) {
-        throw new UnsupportedOperationException("Operation not supported on a " + this.getClass() + " response.");
+        return getCookies().findCookie(name);
     }
 
     /**