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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIUTF8StringEnumerator;
+interface nsIStreamListener;
+interface nsISupports;
+
+/**
+ * A channel interface which allows special handling of encoded content
+ */
+
+[scriptable, uuid(29c29ce6-8ce4-45e6-8d60-36c8fa3e255b)]
+interface nsIEncodedChannel : nsISupports
+{
+ /**
+ * This attribute holds the MIME types corresponding to the content
+ * encodings on the channel. The enumerator returns nsISupportsCString
+ * objects. The first one corresponds to the outermost encoding on the
+ * channel and then we work our way inward. "identity" is skipped and not
+ * represented on the list. Unknown encodings make the enumeration stop.
+ * If you want the actual Content-Encoding value, use
+ * getResponseHeader("Content-Encoding").
+ *
+ * When there is no Content-Encoding header, this property is null.
+ *
+ * Modifying the Content-Encoding header on the channel will cause
+ * this enumerator to have undefined behavior. Don't do it.
+ *
+ * Also note that contentEncodings only exist during or after OnStartRequest.
+ * Calling contentEncodings before OnStartRequest is an error.
+ */
+ readonly attribute nsIUTF8StringEnumerator contentEncodings;
+
+ /**
+ * This attribute controls whether or not content conversion should be
+ * done per the Content-Encoding response header. applyConversion can only
+ * be set before or during OnStartRequest. Calling this during
+ * OnDataAvailable is an error.
+ *
+ * TRUE by default.
+ */
+ attribute boolean applyConversion;
+
+ /**
+ * This function will start converters if they are available.
+ * aNewNextListener will be nullptr if no converter is available.
+ */
+ void doApplyContentConversions(in nsIStreamListener aNextListener,
+ out nsIStreamListener aNewNextListener,
+ in nsISupports aCtxt);
+};