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Src/nprt_plugin/gecko/1.8/win/idl/nsIRequest.idl

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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla 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/MPL/
+ *
+ * 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 the Initial Developer are Copyright (C) 1998
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include "nsISupports.idl"
+
+interface nsILoadGroup;
+
+typedef unsigned long nsLoadFlags;
+
+/**
+ * nsIRequest
+ *
+ * @status FROZEN
+ */
+[scriptable, uuid(ef6bfbd2-fd46-48d8-96b7-9f8f0fd387fe)]
+interface nsIRequest : nsISupports
+{
+    /**
+     * The name of the request.  Often this is the URI of the request.
+     */
+    readonly attribute AUTF8String name;
+
+    /**
+     * @return TRUE if the request has yet to reach completion.
+     * @return FALSE if the request has reached completion (e.g., after
+     *   OnStopRequest has fired).
+     * Suspended requests are still considered pending.
+     */
+    boolean isPending();
+
+    /**
+     * The error status associated with the request.
+     */
+    readonly attribute nsresult status;
+
+    /**
+     * Cancels the current request.  This will close any open input or
+     * output streams and terminate any async requests.  Users should 
+     * normally pass NS_BINDING_ABORTED, although other errors may also
+     * be passed.  The error passed in will become the value of the 
+     * status attribute.
+     *
+     * @param aStatus the reason for canceling this request.
+     *
+     * NOTE: most nsIRequest implementations expect aStatus to be a
+     * failure code; however, some implementations may allow aStatus to
+     * be a success code such as NS_OK.  In general, aStatus should be
+     * a failure code.
+     */
+    void cancel(in nsresult aStatus);
+
+    /**
+     * Suspends the current request.  This may have the effect of closing
+     * any underlying transport (in order to free up resources), although
+     * any open streams remain logically opened and will continue delivering
+     * data when the transport is resumed. 
+     *
+     * NOTE: some implementations are unable to immediately suspend, and
+     * may continue to deliver events already posted to an event queue. In
+     * general, callers should be capable of handling events even after 
+     * suspending a request.
+     */
+    void suspend();
+
+    /**
+     * Resumes the current request.  This may have the effect of re-opening
+     * any underlying transport and will resume the delivery of data to 
+     * any open streams.
+     */
+    void resume();
+
+    /**
+     * The load group of this request.  While pending, the request is a 
+     * member of the load group.  It is the responsibility of the request
+     * to implement this policy.
+     */
+    attribute nsILoadGroup loadGroup;
+
+    /**
+     * The load flags of this request.  Bits 0-15 are reserved.
+     *
+     * When added to a load group, this request's load flags are merged with
+     * the load flags of the load group.
+     */
+    attribute nsLoadFlags loadFlags;
+
+    /**************************************************************************
+     * Listed below are the various load flags which may be or'd together.
+     */
+
+    /**
+     * No special load flags:
+     */
+    const unsigned long LOAD_NORMAL = 0;
+
+    /** 
+     * Don't deliver status notifications to the nsIProgressEventSink, or keep 
+     * this load from completing the nsILoadGroup it may belong to.
+     */
+    const unsigned long LOAD_BACKGROUND = 1 << 0; 
+
+    /**************************************************************************
+     * The following flags control the flow of data into the cache.
+     */
+
+    /**
+     * This flag prevents caching of any kind.  It does not, however, prevent
+     * cached content from being used to satisfy this request.
+     */
+    const unsigned long INHIBIT_CACHING = 1 << 7;
+
+    /**
+     * This flag prevents caching on disk (or other persistent media), which
+     * may be needed to preserve privacy.  For HTTPS, this flag is set auto-
+     * matically.
+     */
+    const unsigned long INHIBIT_PERSISTENT_CACHING = 1 << 8;
+
+    /**************************************************************************
+     * The following flags control what happens when the cache contains data
+     * that could perhaps satisfy this request.  They are listed in descending
+     * order of precidence.
+     */
+
+    /**
+     * Force an end-to-end download of content data from the origin server.
+     * This flag is used for a shift-reload.
+     */
+    const unsigned long LOAD_BYPASS_CACHE = 1 << 9;
+
+    /**
+     * Load from the cache, bypassing protocol specific validation logic.  This
+     * flag is used when browsing via history.  It is not recommended for normal
+     * browsing as it may likely violate reasonable assumptions made by the 
+     * server and confuse users.
+     */
+    const unsigned long LOAD_FROM_CACHE   = 1 << 10;
+
+    /**
+     * The following flags control the frequency of cached content validation
+     * when neither LOAD_BYPASS_CACHE or LOAD_FROM_CACHE are set.  By default,
+     * cached content is automatically validated if necessary before reuse.
+     * 
+     * VALIDATE_ALWAYS forces validation of any cached content independent of
+     * its expiration time.
+     * 
+     * VALIDATE_NEVER disables validation of expired content.
+     *
+     * VALIDATE_ONCE_PER_SESSION disables validation of expired content, 
+     * provided it has already been validated (at least once) since the start 
+     * of this session.
+     *
+     * NOTE TO IMPLEMENTORS:
+     *   These flags are intended for normal browsing, and they should therefore
+     *   not apply to content that must be validated before each use.  Consider,
+     *   for example, a HTTP response with a "Cache-control: no-cache" header.
+     *   According to RFC2616, this response must be validated before it can
+     *   be taken from a cache.  Breaking this requirement could result in 
+     *   incorrect and potentially undesirable side-effects.
+     */
+    const unsigned long VALIDATE_ALWAYS           = 1 << 11;
+    const unsigned long VALIDATE_NEVER            = 1 << 12;
+    const unsigned long VALIDATE_ONCE_PER_SESSION = 1 << 13;
+};