diff --git a/mozilla/modules/plugin/base/public/Makefile.in b/mozilla/modules/plugin/base/public/Makefile.in
index 4b52b417335..86b1b035ac1 100644
--- a/mozilla/modules/plugin/base/public/Makefile.in
+++ b/mozilla/modules/plugin/base/public/Makefile.in
@@ -65,6 +65,7 @@ EXPORTS		+= \
 
 XPIDLSRCS 	= \
 		nsIScriptablePlugin.idl \
+		nsIHTTPHeaderListener.idl     \
 		$(NULL)
 
 EXPORTS		:= $(addprefix $(srcdir)/, $(EXPORTS))
diff --git a/mozilla/modules/plugin/base/public/makefile.win b/mozilla/modules/plugin/base/public/makefile.win
index 887ed91a3d3..e2bb43b0f22 100644
--- a/mozilla/modules/plugin/base/public/makefile.win
+++ b/mozilla/modules/plugin/base/public/makefile.win
@@ -54,7 +54,9 @@ EXPORTS = $(EXPORTS)                          \
         nsIPluginInputStream2.h
 
 XPIDLSRCS = 				      \
-	.\nsIScriptablePlugin.idl
+	.\nsIScriptablePlugin.idl             \
+	.\nsIHTTPHeaderListener.idl     \
+	$(NULL)
 
 include <$(DEPTH)/config/rules.mak>
 
diff --git a/mozilla/modules/plugin/base/public/nsIHTTPHeaderListener.idl b/mozilla/modules/plugin/base/public/nsIHTTPHeaderListener.idl
new file mode 100644
index 00000000000..bb429605f3b
--- /dev/null
+++ b/mozilla/modules/plugin/base/public/nsIHTTPHeaderListener.idl
@@ -0,0 +1,57 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * The contents of this file are subject to the Netscape Public
+ * License Version 1.1 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.mozilla.org/NPL/
+ *
+ * Software distributed under the License is distributed on an "AS
+ * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+ * implied. See the License for the specific language governing
+ * rights and limitations under the License.
+ *
+ * The Original Code is mozilla.org code.
+ *
+ * The Initial Developer of the Original Code is Netscape
+ * Communications Corporation.  Portions created by Netscape are
+ * Copyright (C) 1998 Netscape Communications Corporation. All
+ * Rights Reserved.
+ *
+ * Contributor(s): Ed Burns <edburns@acm.org>
+ */
+
+#include "nsPluginDefs.idl"
+
+/**
+ 
+ * The nsIHTTPHeaderListener interface allows plugin authors to
+ * access HTTP Response headers after issuing an
+ * nsIPluginManager::{GetURL,PostURL}() call. <P>
+
+ * IMPORTANT NOTE: The plugin author must provide an instance to
+ * {GetURL,PostURL}() that implements both nsIPluginStreamListener and
+ * nsIHTTPHeaderListener.  This instance is passed in through
+ * {GetURL,PostURL}()'s streamListener parameter.  The browser will then
+ * QI thi streamListener to see if it implements
+ * nsIHTTPHeaderListener.
+
+ */
+
+[scriptable, uuid(8b246748-1dd2-11b2-9512-9dc84a95fc2f)]
+interface nsIHTTPHeaderListener : nsISupports
+{
+
+  /**
+
+   * Called for each HTTP Response header.
+
+   * NOTE: You must copy the values of the params.  
+
+   */
+
+  void newResponseHeader(in string headerName, in string headerValue);
+};
+
+////////////////////////////////////////////////////////////////////////////////
+
+#endif /* nsIPluginStreamListener_h___ */
diff --git a/mozilla/modules/plugin/public/Makefile.in b/mozilla/modules/plugin/public/Makefile.in
index 4b52b417335..86b1b035ac1 100644
--- a/mozilla/modules/plugin/public/Makefile.in
+++ b/mozilla/modules/plugin/public/Makefile.in
@@ -65,6 +65,7 @@ EXPORTS		+= \
 
 XPIDLSRCS 	= \
 		nsIScriptablePlugin.idl \
+		nsIHTTPHeaderListener.idl     \
 		$(NULL)
 
 EXPORTS		:= $(addprefix $(srcdir)/, $(EXPORTS))
diff --git a/mozilla/modules/plugin/public/makefile.win b/mozilla/modules/plugin/public/makefile.win
index 887ed91a3d3..e2bb43b0f22 100644
--- a/mozilla/modules/plugin/public/makefile.win
+++ b/mozilla/modules/plugin/public/makefile.win
@@ -54,7 +54,9 @@ EXPORTS = $(EXPORTS)                          \
         nsIPluginInputStream2.h
 
 XPIDLSRCS = 				      \
-	.\nsIScriptablePlugin.idl
+	.\nsIScriptablePlugin.idl             \
+	.\nsIHTTPHeaderListener.idl     \
+	$(NULL)
 
 include <$(DEPTH)/config/rules.mak>
 
diff --git a/mozilla/modules/plugin/public/nsIHTTPHeaderListener.idl b/mozilla/modules/plugin/public/nsIHTTPHeaderListener.idl
new file mode 100644
index 00000000000..bb429605f3b
--- /dev/null
+++ b/mozilla/modules/plugin/public/nsIHTTPHeaderListener.idl
@@ -0,0 +1,57 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * The contents of this file are subject to the Netscape Public
+ * License Version 1.1 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.mozilla.org/NPL/
+ *
+ * Software distributed under the License is distributed on an "AS
+ * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+ * implied. See the License for the specific language governing
+ * rights and limitations under the License.
+ *
+ * The Original Code is mozilla.org code.
+ *
+ * The Initial Developer of the Original Code is Netscape
+ * Communications Corporation.  Portions created by Netscape are
+ * Copyright (C) 1998 Netscape Communications Corporation. All
+ * Rights Reserved.
+ *
+ * Contributor(s): Ed Burns <edburns@acm.org>
+ */
+
+#include "nsPluginDefs.idl"
+
+/**
+ 
+ * The nsIHTTPHeaderListener interface allows plugin authors to
+ * access HTTP Response headers after issuing an
+ * nsIPluginManager::{GetURL,PostURL}() call. <P>
+
+ * IMPORTANT NOTE: The plugin author must provide an instance to
+ * {GetURL,PostURL}() that implements both nsIPluginStreamListener and
+ * nsIHTTPHeaderListener.  This instance is passed in through
+ * {GetURL,PostURL}()'s streamListener parameter.  The browser will then
+ * QI thi streamListener to see if it implements
+ * nsIHTTPHeaderListener.
+
+ */
+
+[scriptable, uuid(8b246748-1dd2-11b2-9512-9dc84a95fc2f)]
+interface nsIHTTPHeaderListener : nsISupports
+{
+
+  /**
+
+   * Called for each HTTP Response header.
+
+   * NOTE: You must copy the values of the params.  
+
+   */
+
+  void newResponseHeader(in string headerName, in string headerValue);
+};
+
+////////////////////////////////////////////////////////////////////////////////
+
+#endif /* nsIPluginStreamListener_h___ */