diff --git a/codec-http/src/main/java/io/netty/handler/codec/http/HttpHeaderNames.java b/codec-http/src/main/java/io/netty/handler/codec/http/HttpHeaderNames.java
index f6f15ddc13..811712abe5 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/http/HttpHeaderNames.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/http/HttpHeaderNames.java
@@ -160,6 +160,10 @@ public final class HttpHeaderNames {
      * {@code "date"}
      */
     public static final AsciiString DATE = AsciiString.cached("date");
+    /**
+     * {@code "dnt"}
+     */
+    public static final AsciiString DNT = AsciiString.cached("dnt");
     /**
      * {@code "etag"}
      */
@@ -318,6 +322,10 @@ public final class HttpHeaderNames {
      * {@code "upgrade"}
      */
     public static final AsciiString UPGRADE = AsciiString.cached("upgrade");
+    /**
+     * {@code "upgrade-insecure-requests"}
+     */
+    public static final AsciiString UPGRADE_INSECURE_REQUESTS = AsciiString.cached("upgrade-insecure-requests");
     /**
      * {@code "user-agent"}
      */
@@ -354,6 +362,10 @@ public final class HttpHeaderNames {
      * {@code "x-frame-options"}
      */
     public static final AsciiString X_FRAME_OPTIONS = AsciiString.cached("x-frame-options");
+    /**
+     * {@code "x-requested-with"}
+     */
+    public static final AsciiString X_REQUESTED_WITH = AsciiString.cached("x-requested-with");
 
     private HttpHeaderNames() { }
 }
diff --git a/codec-http/src/main/java/io/netty/handler/codec/http/HttpHeaderValues.java b/codec-http/src/main/java/io/netty/handler/codec/http/HttpHeaderValues.java
index 2b5b6bbe02..97d9a316e2 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/http/HttpHeaderValues.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/http/HttpHeaderValues.java
@@ -35,6 +35,14 @@ public final class HttpHeaderValues {
      * {@code "application/octet-stream"}
      */
     public static final AsciiString APPLICATION_OCTET_STREAM = AsciiString.cached("application/octet-stream");
+    /**
+     * {@code "application/xhtml+xml"}
+     */
+    public static final AsciiString APPLICATION_XHTML = AsciiString.cached("application/xhtml+xml");
+    /**
+     * {@code "application/xml"}
+     */
+    public static final AsciiString APPLICATION_XML = AsciiString.cached("application/xml");
     /**
      * {@code "attachment"}
      * See {@link HttpHeaderNames#CONTENT_DISPOSITION}
@@ -192,6 +200,18 @@ public final class HttpHeaderValues {
      * {@code "s-maxage"}
      */
     public static final AsciiString S_MAXAGE = AsciiString.cached("s-maxage");
+    /**
+     * {@code "text/css"}
+     */
+    public static final AsciiString TEXT_CSS = AsciiString.cached("text/css");
+    /**
+     * {@code "text/html"}
+     */
+    public static final AsciiString TEXT_HTML = AsciiString.cached("text/html");
+    /**
+     * {@code "text/event-stream"}
+     */
+    public static final AsciiString TEXT_EVENT_STREAM = AsciiString.cached("text/event-stream");
     /**
      * {@code "text/plain"}
      */
@@ -208,6 +228,10 @@ public final class HttpHeaderValues {
      * {@code "websocket"}
      */
     public static final AsciiString WEBSOCKET = AsciiString.cached("websocket");
+    /**
+     * {@code "websocket"}
+     */
+    public static final AsciiString XML_HTTP_REQUEST = AsciiString.cached("XmlHttpRequest");
 
     private HttpHeaderValues() { }
 }