mozilla-central/uriloader/base/nsIWebProgressListener.idl (file symbol)

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/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* 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 nsIWebProgress;
interface nsIRequest;
interface nsIURI;
/**
* The nsIWebProgressListener interface is implemented by clients wishing to
* listen in on the progress associated with the loading of asynchronous
* requests in the context of a nsIWebProgress instance as well as any child
* nsIWebProgress instances. nsIWebProgress.idl describes the parent-child
* relationship of nsIWebProgress instances.
*/
[scriptable, uuid(a9df523b-efe2-421e-9d8e-3d7f807dda4c)]
interface nsIWebProgressListener : nsISupports
{
/**
* State Transition Flags
*
* These flags indicate the various states that requests may transition
* through as they are being loaded. These flags are mutually exclusive.
*
* For any given request, onStateChange is called once with the STATE_START
* flag, zero or more times with the STATE_TRANSFERRING flag or once with the
* STATE_REDIRECTING flag, and then finally once with the STATE_STOP flag.
* NOTE: For document requests, a second STATE_STOP is generated (see the
* description of STATE_IS_WINDOW for more details).
*
* STATE_START
* This flag indicates the start of a request. This flag is set when a
* request is initiated. The request is complete when onStateChange is
* called for the same request with the STATE_STOP flag set.
*
* STATE_REDIRECTING
* This flag indicates that a request is being redirected. The request
* passed to onStateChange is the request that is being redirected. When a
* redirect occurs, a new request is generated automatically to process the
* new request. Expect a corresponding STATE_START event for the new
* request, and a STATE_STOP for the redirected request.
*
* STATE_TRANSFERRING
* This flag indicates that data for a request is being transferred to an
* end consumer. This flag indicates that the request has been targeted,
* and that the user may start seeing content corresponding to the request.
*
* STATE_NEGOTIATING
* This flag is not used.
*
* STATE_STOP
* This flag indicates the completion of a request. The aStatus parameter
* to onStateChange indicates the final status of the request.
*/
const unsigned long STATE_START = 0x00000001;
const unsigned long STATE_REDIRECTING = 0x00000002;
const unsigned long STATE_TRANSFERRING = 0x00000004;
const unsigned long STATE_NEGOTIATING = 0x00000008;
const unsigned long STATE_STOP = 0x00000010;
/**
* State Type Flags
*
* These flags further describe the entity for which the state transition is
* occuring. These flags are NOT mutually exclusive (i.e., an onStateChange
* event may indicate some combination of these flags).
*
* STATE_IS_REQUEST
* This flag indicates that the state transition is for a request, which
* includes but is not limited to document requests. (See below for a
* description of document requests.) Other types of requests, such as
* requests for inline content (e.g., images and stylesheets) are
* considered normal requests.
*
* STATE_IS_DOCUMENT
* This flag indicates that the state transition is for a document request.
* This flag is set in addition to STATE_IS_REQUEST. A document request
* supports the nsIChannel interface and its loadFlags attribute includes
* the nsIChannel::LOAD_DOCUMENT_URI flag.
*
* A document request does not complete until all requests associated with
* the loading of its corresponding document have completed. This includes
* other document requests (e.g., corresponding to HTML <iframe> elements).
* The document corresponding to a document request is available via the
* DOMWindow attribute of onStateChange's aWebProgress parameter.
*
* STATE_IS_NETWORK
* This flag indicates that the state transition corresponds to the start
* or stop of activity in the indicated nsIWebProgress instance. This flag
* is accompanied by either STATE_START or STATE_STOP, and it may be
* combined with other State Type Flags.
*
* Unlike STATE_IS_WINDOW, this flag is only set when activity within the
* nsIWebProgress instance being observed starts or stops. If activity
* only occurs in a child nsIWebProgress instance, then this flag will be
* set to indicate the start and stop of that activity.
*
* For example, in the case of navigation within a single frame of a HTML
* frameset, a nsIWebProgressListener instance attached to the
* nsIWebProgress of the frameset window will receive onStateChange calls
* with the STATE_IS_NETWORK flag set to indicate the start and stop of
* said navigation. In other words, an observer of an outer window can
* determine when activity, that may be constrained to a child window or
* set of child windows, starts and stops.
*
* STATE_IS_WINDOW
* This flag indicates that the state transition corresponds to the start
* or stop of activity in the indicated nsIWebProgress instance. This flag
* is accompanied by either STATE_START or STATE_STOP, and it may be
* combined with other State Type Flags.
*
* This flag is similar to STATE_IS_DOCUMENT. However, when a document
* request completes, two onStateChange calls with STATE_STOP are
* generated. The document request is passed as aRequest to both calls.
* The first has STATE_IS_REQUEST and STATE_IS_DOCUMENT set, and the second
* has the STATE_IS_WINDOW flag set (and possibly the STATE_IS_NETWORK flag
* set as well -- see above for a description of when the STATE_IS_NETWORK
* flag may be set). This second STATE_STOP event may be useful as a way
* to partition the work that occurs when a document request completes.
*
* STATE_IS_REDIRECTED_DOCUMENT
* Same as STATE_IS_DOCUMENT, but sent only after a redirect has occured.
* Introduced in order not to confuse existing code with extra state change
* events. See |nsDocLoader::OnStartRequest| for more info.
*/
const unsigned long STATE_IS_REQUEST = 0x00010000;
const unsigned long STATE_IS_DOCUMENT = 0x00020000;
const unsigned long STATE_IS_NETWORK = 0x00040000;
const unsigned long STATE_IS_WINDOW = 0x00080000;
const unsigned long STATE_IS_REDIRECTED_DOCUMENT = 0x00100000;
/**
* State Modifier Flags
*
* These flags further describe the transition which is occuring. These
* flags are NOT mutually exclusive (i.e., an onStateChange event may
* indicate some combination of these flags).
*
* STATE_RESTORING
* This flag indicates that the state transition corresponds to the start
* or stop of activity for restoring a previously-rendered presentation.
* As such, there is no actual network activity associated with this
* request, and any modifications made to the document or presentation
* when it was originally loaded will still be present.
*/
const unsigned long STATE_RESTORING = 0x01000000;
/**
* State Security Flags
*
* These flags describe the security state reported by a call to the
* onSecurityChange method. These flags are mutually exclusive.
*
* STATE_IS_INSECURE
* This flag indicates that the data corresponding to the request
* was received over an insecure channel.
*
* STATE_IS_BROKEN
* This flag indicates an unknown security state. This may mean that the
* request is being loaded as part of a page in which some content was
* received over an insecure channel.
*
* STATE_IS_SECURE
* This flag indicates that the data corresponding to the request was
* received over a secure channel. The degree of security is expressed by
* STATE_SECURE_HIGH, STATE_SECURE_MED, or STATE_SECURE_LOW.
*/
const unsigned long STATE_IS_INSECURE = 0x00000004;
const unsigned long STATE_IS_BROKEN = 0x00000001;
const unsigned long STATE_IS_SECURE = 0x00000002;
/**
* Mixed active content flags
*
* NOTE: IF YOU ARE ADDING MORE OF THESE FLAGS, MAKE SURE TO EDIT
* nsSecureBrowserUIImpl::CheckForBlockedContent().
*
* May be set in addition to the State Security Flags, to indicate that
* mixed active content has been encountered.
*
* STATE_BLOCKED_MIXED_ACTIVE_CONTENT
* Mixed active content has been blocked from loading.
*
* STATE_LOADED_MIXED_ACTIVE_CONTENT
* Mixed active content has been loaded. State should be STATE_IS_BROKEN.
*/
const unsigned long STATE_BLOCKED_MIXED_ACTIVE_CONTENT = 0x00000010;
const unsigned long STATE_LOADED_MIXED_ACTIVE_CONTENT = 0x00000020;
/**
* Mixed display content flags
*
* NOTE: IF YOU ARE ADDING MORE OF THESE FLAGS, MAKE SURE TO EDIT
* nsSecureBrowserUIImpl::CheckForBlockedContent().
*
* May be set in addition to the State Security Flags, to indicate that
* mixed display content has been encountered.
*
* STATE_BLOCKED_MIXED_DISPLAY_CONTENT
* Mixed display content has been blocked from loading.
*
* STATE_LOADED_MIXED_DISPLAY_CONTENT
* Mixed display content has been loaded. State should be STATE_IS_BROKEN.
*/
const unsigned long STATE_BLOCKED_MIXED_DISPLAY_CONTENT = 0x00000100;
const unsigned long STATE_LOADED_MIXED_DISPLAY_CONTENT = 0x00000200;
/**
* State bits for EV == Extended Validation == High Assurance
*
* These flags describe the level of identity verification
* in a call to the onSecurityChange method.
*
* STATE_IDENTITY_EV_TOPLEVEL
* The topmost document uses an EV cert.
* NOTE: Available since Gecko 1.9
*/
const unsigned long STATE_IDENTITY_EV_TOPLEVEL = 0x00100000;
/***
* Associated state flag
*
* This flag is used to if a page is inheriting its security context.
*
* STATE_IDENTITY_ASSOCIATED
* This document doesn't have an identity of its own, and instead
* uses its predecessor's identity.
*/
const unsigned long STATE_IDENTITY_ASSOCIATED = 0x00200000;
/**
* Broken state flags
*
* These flags describe the reason of the broken state.
*
* STATE_USES_SSL_3
* The topmost document uses SSL 3.0.
*
* STATE_USES_WEAK_CRYPTO
* The topmost document uses a weak cipher suite such as RC4.
*
* STATE_CERT_USER_OVERRIDDEN
* The user has added a security exception for the site.
*/
const unsigned long STATE_USES_SSL_3 = 0x01000000;
const unsigned long STATE_USES_WEAK_CRYPTO = 0x02000000;
const unsigned long STATE_CERT_USER_OVERRIDDEN = 0x04000000;
/**
* Content Blocking Event flags
*
* NOTE: IF YOU ARE ADDING MORE OF THESE FLAGS, MAKE SURE TO EDIT
* nsSecureBrowserUIImpl::CheckForBlockedContent() AND UPDATE THE
* CORRESPONDING LIST IN ContentBlockingController.java
*
* These flags describe the reason of cookie jar rejection.
*
* STATE_BLOCKED_TRACKING_CONTENT
* Tracking content has been blocked from loading.
*
* STATE_LOADED_LEVEL_1_TRACKING_CONTENT
* Tracking content from the Disconnect Level 1 list has been loaded.
*
* STATE_LOADED_LEVEL_2_TRACKING_CONTENT
* Tracking content from the Disconnect Level 2 list has been loaded.
*
* STATE_BLOCKED_FINGERPRINTING_CONTENT
* Fingerprinting content has been blocked from loading.
*
* STATE_LOADED_FINGERPRINTING_CONTENT
* Fingerprinting content has been loaded.
*
* STATE_REPLACED_FINGERPRINTING_CONTENT
* Fingerprinting content which should be blocked from loading was replaced with a
* shim.
*
* STATE_ALLOWED_FINGERPRINTING_CONTENT
* Fingerprinting content which should be blocked from loading was allowed.
*
* STATE_BLOCKED_CRYPTOMINING_CONTENT
* Cryptomining content has been blocked from loading.
*
* STATE_LOADED_CRYPTOMINING_CONTENT
* Cryptomining content has been loaded.
*
* STATE_BLOCKED_UNSAFE_CONTENT
* Content which againts SafeBrowsing list has been blocked from loading.
*
* STATE_COOKIES_LOADED
* Performed a storage access check, which usually means something like a
* cookie or a storage item was loaded/stored on the current tab.
* Alternatively this could indicate that something in the current tab
* attempted to communicate with its same-origin counterparts in other
* tabs.
*
* STATE_COOKIES_LOADED_TRACKER
* Similar to STATE_COOKIES_LOADED, but only sent if the subject of the
* action was a third-party tracker when the active cookie policy imposes
* restrictions on such content.
*
* STATE_COOKIES_LOADED_SOCIALTRACKER
* Similar to STATE_COOKIES_LOADED, but only sent if the subject of the
* action was a third-party social tracker when the active cookie policy
* imposes restrictions on such content.
*
* STATE_COOKIES_BLOCKED_BY_PERMISSION
* Rejected for custom site permission.
*
* STATE_COOKIES_BLOCKED_TRACKER
* Rejected because the resource is a tracker and cookie policy doesn't
* allow its loading.
*
* STATE_COOKIES_BLOCKED_SOCIALTRACKER
* Rejected because the resource is a tracker from a social origin and
* cookie policy doesn't allow its loading.
*
* STATE_COOKIES_PARTITIONED_TRACKER
* Rejected because the resource is a third-party tracker and cookie policy
* forces third-party resources to be partitioned.
*
* STATE_COOKIES_PARTITIONED_FOREIGN
* Rejected because the resource is a third-party and cookie policy forces
* third-party resources to be partitioned.
*
* STATE_COOKIES_BLOCKED_ALL
* Rejected because cookie policy blocks all cookies.
*
* STATE_COOKIES_BLOCKED_FOREIGN
* Rejected because cookie policy blocks 3rd party cookies.
*
* STATE_BLOCKED_SOCIALTRACKING_CONTENT
* SocialTracking content has been blocked from loading.
*
* STATE_LOADED_SOCIALTRACKING_CONTENT
* SocialTracking content has been loaded.
*
* STATE_REPLACED_TRACKING_CONTENT
* Tracking content which should be blocked from loading was replaced with a
* shim.
*
* STATE_ALLOWED_TRACKING_CONTENT
* Tracking content which should be blocked from loading was allowed.
*
* STATE_BLOCKED_EMAILTRACING_CONTENT
* EmailTracking content has been blocked from loading.
*
* STATE_LOADED_EMAILTRACKING_LEVEL_1_CONTENT
* EmailTracking content from the Disconnect level 1 has been loaded.
*
* STATE_LOADED_EMAILTRACKING_LEVEL_2_CONTENT
* EmailTracking content from the Disconnect level 2 has been loaded.
*
* STATE_ALLOWED_CANVAS_FINGERPRINTING
* A potential attempt to fingerprint using the canvas API was observed.
*
* STATE_ALLOWED_FONT_FINGERPRINTING
* A potential attempt to fingerprint by checking the exposed fonts
* was observed.
*
* STATE_BLOCKED_SUSPICIOUS_FINGERPRINTING
* Suspicious fingerprinting activity has been blocked by the fingerprinting
* protection.
*
* STATE_PURGED_BOUNCETRACKER
* BounceTrackingProtection purged state for a bounce tracker.
*/
const unsigned long STATE_BLOCKED_TRACKING_CONTENT = 1 << 12;
const unsigned long STATE_LOADED_LEVEL_1_TRACKING_CONTENT = 1 << 13;
const unsigned long STATE_LOADED_LEVEL_2_TRACKING_CONTENT = 1 << 20;
const unsigned long STATE_BLOCKED_FINGERPRINTING_CONTENT = 1 << 6;
const unsigned long STATE_LOADED_FINGERPRINTING_CONTENT = 1 << 10;
const unsigned long STATE_REPLACED_FINGERPRINTING_CONTENT = 1 << 27;
const unsigned long STATE_ALLOWED_FINGERPRINTING_CONTENT = 1 << 9;
const unsigned long STATE_BLOCKED_CRYPTOMINING_CONTENT = 1 << 11;
const unsigned long STATE_LOADED_CRYPTOMINING_CONTENT = 1 << 21;
const unsigned long STATE_BLOCKED_UNSAFE_CONTENT = 1 << 14;
const unsigned long STATE_COOKIES_LOADED = 1 << 15;
const unsigned long STATE_COOKIES_LOADED_TRACKER = 1 << 18;
const unsigned long STATE_COOKIES_LOADED_SOCIALTRACKER = 1 << 19;
const unsigned long STATE_COOKIES_BLOCKED_BY_PERMISSION = 1 << 28;
const unsigned long STATE_COOKIES_BLOCKED_TRACKER = 1 << 29;
const unsigned long STATE_COOKIES_BLOCKED_SOCIALTRACKER = 1 << 24;
const unsigned long STATE_COOKIES_BLOCKED_ALL = 1 << 30;
const unsigned long STATE_COOKIES_PARTITIONED_TRACKER = 1 << 1;
const unsigned long STATE_COOKIES_PARTITIONED_FOREIGN = 1 << 31;
const unsigned long STATE_COOKIES_BLOCKED_FOREIGN = 1 << 7;
const unsigned long STATE_BLOCKED_SOCIALTRACKING_CONTENT = 1 << 16;
const unsigned long STATE_LOADED_SOCIALTRACKING_CONTENT = 1 << 17;
const unsigned long STATE_REPLACED_TRACKING_CONTENT = 1 << 4;
const unsigned long STATE_ALLOWED_TRACKING_CONTENT = 1 << 5;
const unsigned long STATE_BLOCKED_EMAILTRACKING_CONTENT = 1 << 22;
const unsigned long STATE_LOADED_EMAILTRACKING_LEVEL_1_CONTENT = 1 << 23;
const unsigned long STATE_LOADED_EMAILTRACKING_LEVEL_2_CONTENT = 1 << 8;
const unsigned long STATE_ALLOWED_CANVAS_FINGERPRINTING = 1 << 25;
const unsigned long STATE_ALLOWED_FONT_FINGERPRINTING = 1 << 26;
const unsigned long STATE_BLOCKED_SUSPICIOUS_FINGERPRINTING = 1 << 2;
const unsigned long STATE_PURGED_BOUNCETRACKER = 1 << 3;
/**
* Flags for HTTPS-Only and HTTPS-First Mode upgrades
*
* STATE_HTTPS_ONLY_MODE_UPGRADED
* When a request has been upgraded by HTTPS-Only Mode
*
* STATE_HTTPS_ONLY_MODE_UPGRADE_FAILED
* When an upgraded request failed.
*
* STATE_HTTPS_ONLY_MODE_UPGRADED_FIRST
* When a request has been upgraded by HTTPS-First Mode
*/
const unsigned long STATE_HTTPS_ONLY_MODE_UPGRADED = 0x00400000;
const unsigned long STATE_HTTPS_ONLY_MODE_UPGRADE_FAILED = 0x00800000;
const unsigned long STATE_HTTPS_ONLY_MODE_UPGRADED_FIRST = 0x08000000;
/**
* Notification indicating the state has changed for one of the requests
* associated with aWebProgress.
*
* @param aWebProgress
* The nsIWebProgress instance that fired the notification
* @param aRequest
* The nsIRequest that has changed state.
* @param aStateFlags
* Flags indicating the new state. This value is a combination of one
* of the State Transition Flags and one or more of the State Type
* Flags defined above. Any undefined bits are reserved for future
* use.
* @param aStatus
* Error status code associated with the state change. This parameter
* should be ignored unless aStateFlags includes the STATE_STOP bit.
* The status code indicates success or failure of the request
* associated with the state change. NOTE: aStatus may be a success
* code even for server generated errors, such as the HTTP 404 error.
* In such cases, the request itself should be queried for extended
* error information (e.g., for HTTP requests see nsIHttpChannel).
*/
void onStateChange(in nsIWebProgress aWebProgress,
in nsIRequest aRequest,
in unsigned long aStateFlags,
in nsresult aStatus);
/**
* Notification that the progress has changed for one of the requests
* associated with aWebProgress. Progress totals are reset to zero when all
* requests in aWebProgress complete (corresponding to onStateChange being
* called with aStateFlags including the STATE_STOP and STATE_IS_WINDOW
* flags).
*
* @param aWebProgress
* The nsIWebProgress instance that fired the notification.
* @param aRequest
* The nsIRequest that has new progress.
* @param aCurSelfProgress
* The current progress for aRequest.
* @param aMaxSelfProgress
* The maximum progress for aRequest.
* @param aCurTotalProgress
* The current progress for all requests associated with aWebProgress.
* @param aMaxTotalProgress
* The total progress for all requests associated with aWebProgress.
*
* NOTE: If any progress value is unknown, or if its value would exceed the
* maximum value of type long, then its value is replaced with -1.
*
* NOTE: If the object also implements nsIWebProgressListener2 and the caller
* knows about that interface, this function will not be called. Instead,
* nsIWebProgressListener2::onProgressChange64 will be called.
*/
void onProgressChange(in nsIWebProgress aWebProgress,
in nsIRequest aRequest,
in long aCurSelfProgress,
in long aMaxSelfProgress,
in long aCurTotalProgress,
in long aMaxTotalProgress);
/**
* Flags for onLocationChange
*
* LOCATION_CHANGE_SAME_DOCUMENT
* This flag is on when |aWebProgress| did not load a new document.
* For example, the location change is due to an anchor scroll or a
* pushState/popState/replaceState.
*
* LOCATION_CHANGE_ERROR_PAGE
* This flag is on when |aWebProgress| redirected from the requested
* contents to an internal page to show error status, such as
* <about:neterror>, <about:certerror> and so on.
*
* Generally speaking, |aURI| and |aRequest| are the original data. DOM
* |window.location.href| is also the original location, while
* |document.documentURI| is the redirected location. Sometimes |aURI| is
* <about:blank> and |aRequest| is null when the original data does not
+ remain.
*
* |aWebProgress| does NOT set this flag when it did not try to load a new
* document. In this case, it should set LOCATION_CHANGE_SAME_DOCUMENT.
*
* LOCATION_CHANGE_RELOAD
* This flag is on when reloading the current page, either from
* location.reload() or the browser UI.
*
* LOCATION_CHANGE_HASHCHANGE
* This flag is on for same-document location changes where only the URI's
* reference fragment has changed. This flag implies
* LOCATION_CHANGE_SAME_DOCUMENT.
*
* LOCATION_CHANGE_SESSION_STORE
* This flag is on for location changes that are the result of the session
* store updating the URI of aWebProgress without actually navigating.
*/
const unsigned long LOCATION_CHANGE_SAME_DOCUMENT = 0x00000001;
const unsigned long LOCATION_CHANGE_ERROR_PAGE = 0x00000002;
const unsigned long LOCATION_CHANGE_RELOAD = 0x00000004;
const unsigned long LOCATION_CHANGE_HASHCHANGE = 0x00000008;
const unsigned long LOCATION_CHANGE_SESSION_STORE = 0x00000010;
/**
* Called when the location of the window being watched changes. This is not
* when a load is requested, but rather once it is verified that the load is
* going to occur in the given window. For instance, a load that starts in a
* window might send progress and status messages for the new site, but it
* will not send the onLocationChange until we are sure that we are loading
* this new page here.
*
* @param aWebProgress
* The nsIWebProgress instance that fired the notification.
* @param aRequest
* The associated nsIRequest. This may be null in some cases.
* @param aLocation
* The URI of the location that is being loaded.
* @param aFlags
* This is a value which explains the situation or the reason why
* the location has changed.
*/
void onLocationChange(in nsIWebProgress aWebProgress,
in nsIRequest aRequest,
in nsIURI aLocation,
[optional] in unsigned long aFlags);
/**
* Notification that the status of a request has changed. The status message
* is intended to be displayed to the user (e.g., in the status bar of the
* browser).
*
* @param aWebProgress
* The nsIWebProgress instance that fired the notification.
* @param aRequest
* The nsIRequest that has new status.
* @param aStatus
* This value is not an error code. Instead, it is a numeric value
* that indicates the current status of the request. This interface
* does not define the set of possible status codes. NOTE: Some
* status values are defined by nsITransport and nsISocketTransport.
* @param aMessage
* Localized text corresponding to aStatus.
*/
void onStatusChange(in nsIWebProgress aWebProgress,
in nsIRequest aRequest,
in nsresult aStatus,
in wstring aMessage);
/**
* Notification called for security progress. This method will be called on
* security transitions (eg HTTP -> HTTPS, HTTPS -> HTTP, FOO -> HTTPS) and
* after document load completion. It might also be called if an error
* occurs during network loading.
*
* @param aWebProgress
* The nsIWebProgress instance that fired the notification.
* @param aRequest
* The nsIRequest that has new security state.
* @param aState
* A value composed of the Security State Flags and the Security
* Strength Flags listed above. Any undefined bits are reserved for
* future use.
*
* NOTE: These notifications will only occur if a security package is
* installed.
*/
void onSecurityChange(in nsIWebProgress aWebProgress,
in nsIRequest aRequest,
in unsigned long aState);
/**
* Notification called for content blocking events. This method will be
* called when content gets allowed/blocked for various reasons per the
* Content Blocking rules.
*
* @param aWebProgress
* The nsIWebProgress instance that fired the notification.
* @param aRequest
* The nsIRequest that has new security state.
* @param aEvent
* A value composed of the Content Blocking Event Flags listed above.
* Any undefined bits are reserved for future use.
*/
void onContentBlockingEvent(in nsIWebProgress aWebProgress,
in nsIRequest aRequest,
in unsigned long aEvent);
};