fuchsia.web

Added: 7

PROTOCOLS

Context

Manages browsing state (e.g. LocalStorage, cookies, etc) associated with a set of Frame.

CreateFrame

Creates a new Frame under this Context. Destruction of a Context triggers the destruction of all of its associated Frame. Frame can be transferred to another component but cannot be shared across multiple components.

frame: An interface request that will be bound to the created Frame.

Request

Name	Type
`frame`	`server_end:Frame`

CreateFrameWithParams

Similar to Context.CreateFrame, with extra parameters.

params: The configuration used to create the Frame. This method will fail with ZX_ERR_INVALID_ARGS if the table is not clonable.
frame: An interface request that will be bound to the created Frame.

Request

Name	Type
`params`	`CreateFrameParams`
`frame`	`server_end:Frame`

GetCookieManager

Used to observe cookies for sites hosted under this Context.

Request

Name	Type
`manager`	`server_end:CookieManager`

GetRemoteDebuggingPort

Waits until debugging is available on one or more Frames, and returns the DevTools port number. Multiple calls may be queued to received the port number.

If an error occurred, the ContextError will be set to this value:

REMOTE_DEBUGGING_PORT_NOT_OPENED: remote_debugging_port was not set in CreateContextParams or the remote debugging service failed to start.

Request

<EMPTY>

Response

Name	Type
`payload`	`Context_GetRemoteDebuggingPort_Result`

ContextProvider

Defined in fuchsia.web/context.fidl

The top-level service interface which allows for the creation of Context resources.

Create

Creates a new browser Context whose state is wholly independent and isolated from other Context(Contexts).

params: The configuration used to create the Context.
context: An interface request which will receive a bound Context service.

Request

Name	Type
`params`	`CreateContextParams`
`context`	`server_end:Context`

CookieManager

Defined in fuchsia.web/cookie.fidl

Provides methods for monitoring and accessing browser cookie state.

GetCookieList

Returns a list of Cookies, optionally limited to those matching url, and optionally name. cookies iterates over the matching cookies, including their values.

Request

Name	Type
`url`	`Url`
`name`	`CookieName`
`cookies`	`server_end:CookiesIterator`

ObserveCookieChanges

Observe changes to all cookies named name that would be sent in a request to url.

If neither url nor name are set then all cookies are observed. If only url is set then all cookies for that URL are observed. If both are set then only cookies matching both fields are observed.

changes iterates over a stream of cookie changes. Additions or updates are expressed as complete cookies, while deletions are expressed as cookies with no value set.

Request

Name	Type
`url`	`Url`
`name`	`CookieName`
`changes`	`server_end:CookiesIterator`

CookiesIterator

Defined in fuchsia.web/cookie.fidl

Used to iterator over a set of cookies, or a stream of changes to cookies.

GetNext

Fetches the next batch of cookies, or of changes to cookies. RFC6265 does not specify an upper-bound on the number of cookies which may be stored.

Request

<EMPTY>

Response

Name	Type
`changed_cookies`	`vector<Cookie>`

Debug

Defined in fuchsia.web/debug.fidl

The debug service which allows to enable the DevTools service on Contexts.

EnableDevTools

Enables the DevTools service on every subsequent Context creation and delivers subsequent DevTools events to the supplied listener. The callback indicates when the WebEngine is in a debuggable state. Events will be sent to every listener registered with this method.

Because DevTools debugging is exposed using TCP as its transport, only Contexts created with access to network capabilities will report themselves as available for debugging.

Request

Name	Type
`listener`	`client_end:DevToolsListener`

Response

<EMPTY>

DevToolsListener

Defined in fuchsia.web/debug.fidl

Interface used to observe DevTools service availability events.

OnContextDevToolsAvailable

Called when the DevTools service is available on a new Context.

listener: Channel over which DevTools events for the new Context will be delivered. This channel will disconnect when the Context is destroyed.

Request

Name	Type
`listener`	`server_end:DevToolsPerContextListener`

DevToolsPerContextListener

Defined in fuchsia.web/debug.fidl

Interface supplied by the debugging component to observe the DevTools service opening event.

OnHttpPortOpen

Called when the DevTools service starts accepting TCP connections on port. port will remain open until the Context is destroyed.

port: The port used by the service.

Request

Name	Type
`port`	`uint16`

Frame

Defined in fuchsia.web/frame.fidl

AddBeforeLoadJavaScript

Executes a UTF-8 encoded script for every subsequent page load where the Frame's URL has an origin reflected in origins. The script is executed early, prior to the execution of the document's scripts.

Scripts are identified by a client-managed identifier id. Any script previously injected using the same id will be replaced.

The order in which multiple bindings are executed is the same as the order in which the bindings were added. If a script is added which clobbers an existing script of the same id, the previous script's precedence in the injection order will be preserved.

At least one origins entry must be specified. If a wildcard "*" is specified in origins, then the script will be evaluated unconditionally.

If an error occurred, the FrameError will be set to one of these values:

BUFFER_NOT_UTF8: script is not UTF-8 encoded.
INVALID_ORIGIN: origins is an empty vector.

Request

Name	Type
`id`	`uint64`
`origins`	`vector<Url>`
`script`	`fuchsia.mem/Buffer`

Response

Name	Type
`payload`	`Frame_AddBeforeLoadJavaScript_Result`

Close

Request graceful or immediate teardown of the Frame content and notification of completion via Frame epitaph.

Graceful teardown allows unload and cleanup tasks in the implementation and web content (e.g., unload event handlers) to run for up to the specified period of time. Immediate teardown only runs the minimum cleanup tasks in the implementation and does not allow web content to run event handlers.

If timeout is zero, an immediate teardown is initiated. The channel will close with ZX_OK. This is equivalent to the caller closing the Frame channel.
If timeout is non-zero, a graceful teardown is initiated. The channel will close with ZX_OK if the Frame closes within the specified timeout and with ZX_ERR_TIMED_OUT otherwise.
If timeout is not specified, a reasonable implementation-specific timeout is applied.

Subsequent calls to Close() will override any previously specified Close() timeout.

Added: 10

Request

Name	Type
`payload`	`FrameCloseRequest`

ConfigureInputTypes

Enables or disables the processing of the specified types of user inputs. allow specifies whether to enable or disable the specified types. All input types are enabled by default.

Request

Name	Type
`types`	`InputTypes`
`allow`	`AllowInputState`

CreateView

Creates a new view using the specified view_token. Caller should pass the other end of the token to fuchsia.ui.gfx/ViewHolderArgs to attach the new view to a view tree.

See the description of CreateContextParams.service_directory for additional services that must be present when using this method.

Deprecated: 13

Request

Name	Type
`view_token`	`fuchsia.ui.views/ViewToken`

CreateView2

Creates a new Flatland view using the specified view_creation_token defined under args. Caller should pass the other end of the token to fuchsia.ui.composition/Flatland.CreateViewport to attach the new Flatland view to its graph.

Request

Name	Type
`args`	`CreateView2Args`

CreateViewWithViewRef

Creates a new view using the specified view_token. Caller should pass the other end of the token to fuchsia.ui.gfx/ViewHolderArgs to attach the new view to a view tree. view_ref can be cloned before passing it to this method, which will allow clients to track the view.

view_ref_control must not have the ZX_RIGHT_DUPLICATE set, or view creation will fail and view_token will be closed.

See the description of CreateContextParams.service_directory for additional services that must be present when using this method.

Deprecated: 13

Request

Name	Type
`view_token`	`fuchsia.ui.views/ViewToken`
`view_ref_control`	`fuchsia.ui.views/ViewRefControl`
`view_ref`	`fuchsia.ui.views/ViewRef`

DisableHeadlessRendering

Stops headless rendering of the Frame.

May only be used on a Context created with ContextFeatureFlags.HEADLESS.

Request

<EMPTY>

EnableHeadlessRendering

Enables headless rendering of the Frame.

This is used when content depends on layout and/or animation events firing normally. May only be used on a Context created with ContextFeatureFlags.HEADLESS.

Request

<EMPTY>

ExecuteJavaScript

Executes a UTF-8 encoded script in the Frame if the Frame's URL has an origin which matches entries in origins.

At least one origins entry must be specified. If a wildcard "*" is specified in origins, then the script will be evaluated unconditionally.

Returns the result of executing script, as a JSON-encoded string.

Note that scripts share the same execution context as the document, meaning that document may modify variables, classes, or objects set by the script in arbitrary or unpredictable ways.

If an error occurred, the FrameError will be set to one of these values:

BUFFER_NOT_UTF8: script is not UTF-8 encoded.
INVALID_ORIGIN: The Frame's current URL does not match any of the values in origins or origins is an empty vector.

Request

Name	Type
`origins`	`vector<Url>`
`script`	`fuchsia.mem/Buffer`

Response

Name	Type
`payload`	`Frame_ExecuteJavaScript_Result`

ExecuteJavaScriptNoResult

Variant of Frame.ExecuteJavaScript which executes the supplied script without returning a result.

Request

Name	Type
`origins`	`vector<Url>`
`script`	`fuchsia.mem/Buffer`

Response

Name	Type
`payload`	`Frame_ExecuteJavaScriptNoResult_Result`

ForceContentDimensions

Overrides the dimensions reported to web content. The devicePixelRatio reported to web content will be adjusted in response to changes in the pixel size of the View, rather than changing the size reported to the content. Call with null web_dips to remove any prior forced content dimensions.

Deprecated: 13

Request

Name	Type
`web_dips`	`fuchsia.ui.gfx/vec2?`

GetMediaPlayer

Returns a fuchsia.media.sessions2/Player interface through which media (i.e. video/audio) playback in the frame may be observed, and/or controlled. Only one fuchsia.media.sessions2/Player may be active at a time, for each Frame.

Request

Name	Type
`player`	`server_end:fuchsia.media.sessions2/Player`

GetNavigationController

Returns an interface through which the Frame may be navigated to a desired URL, reloaded, etc.

controller: An asynchronous interface request for the Frame's NavigationController.

Request

Name	Type
`controller`	`server_end:NavigationController`

GetPrivateMemorySize

Returns the amount of private (non-shared) physical memory used by the Frame's main document. The returned size might not reflect the memory usage of embedded iframes.

Request

<EMPTY>

Response

Name	Type
`size_bytes`	`uint64`

PostMessage

Posts a message to the frame's onMessage handler.

target_origin restricts message delivery to the specified origin. If target_origin is "*", then the message will be sent to the document regardless of its origin. See the HTML spec section 9.4.3 for more details on how the target origin policy is applied.

If an error occurred, the FrameError will be set to one of these values:

INTERNAL_ERROR: The WebEngine failed to create a message pipe.
BUFFER_NOT_UTF8: The script in message's data property is not UTF-8 encoded.
INVALID_ORIGIN: origins is an empty vector.
NO_DATA_IN_MESSAGE: The data property is missing in message.

Request

Name	Type
`target_origin`	`Url`
`message`	`WebMessage`

Response

Name	Type
`payload`	`Frame_PostMessage_Result`

RemoveBeforeLoadJavaScript

Removes a previously added JavaScript snippet identified by id. This is a no-op if there is no JavaScript snippet identified by id.

Request

Name	Type
`id`	`uint64`

ResetContentAreaSettings

Reset the Frame's ContentAreaSettings to default values.

Request

<EMPTY>

SetBlockMediaLoading

Sets whether to block all HTMLMediaElements in the frame from fetching and loading media resources.

May be used, for example, to prevent loading media in frames that are not visible.

While media loading is blocked, elements with autoplay set to true will not start playback. The promises returned by calls to play() will remain unresolved until loading is unblocked by a call to this method.

When media loading is unblocked, elements will begin fetching, resource, loading, and playing as appropriate.

Any elements that have begun fetching or loading media resources for the current source before media loading was blocked will continue to fetch, load, and start playback as appropriate. This includes calls to play() even after media loading is blocked.

Request

Name	Type
`blocked`	`bool`

SetConsoleLogSink

Specifies where to emit console log output to. By default log output will be routed to a fuchsia.logger/LogSink obtained via the fuchsia.web/Context's service directory.

sink: The fuchsia.logger/LogSink to use to emit logs. Passing a null handle resets logging to use the default fuchsia.logger/LogSink.

Request

Name	Type
`sink`	`client_end:fuchsia.logger/LogSink?`

SetContentAreaSettings

Sets various settings for how web content should be run in the Frame. May be called at any time, including after the URL has loaded. Each call changes only the specified fields, overwriting any prior value.

This method will fail with ZX_ERR_NOT_SUPPORTED if any value in ContentAreaSettings is not supported by the Frame.

Request

Name	Type
`settings`	`ContentAreaSettings`

SetJavaScriptLogLevel

If set to a value other than ConsoleLogLevel.NONE, allows web content to log messages to the fuchsia.logger/LogSink configured for this Frame, via the console object (e.g. using debug(), log(), info(), warn() and error()). The default value is ConsoleLogLevel.NONE.

As the system log may be persisted, it is recommended that ConsoleLogLevel.NONE be used in Incognito and other private browsing modes.

Log lines are written to the fuchsia.logger/LogsSink configured for this fuchsia.web/Frame, with severities mapped as follows:

debug(), log() and info() are logged at fuchsia.logger/LogLevelFilter.INFO severity.
warn() is logged at fuchsia.logger/LogLevelFilter.WARN severity.
error() is logged at fuchsia.logger/LogLevelFilter.ERROR severity.

Request

Name	Type
`level`	`ConsoleLogLevel`

SetMediaSettings

Sets fuchsia.media/FrameMediaSettings for the frame. The specified parameters are applied to audio streams that started after this message is processed. Should be called before the Frame is navigated to content in order to ensure that the settings applied to all media streams. Due to request pipelining, this means doing so before calling Frame.GetNavigationController() and NavigationController.LoadUrl().

Request

Name	Type
`settings`	`FrameMediaSettings`

SetNavigationEventListener

Sets the listener for handling page navigation events.

listener: The observer to use. Unregisters any existing listener if null.

Request

Name	Type
`listener`	`client_end:NavigationEventListener?`

SetNavigationEventListener2

Sets the listener for handling page navigation events. The listener will receive the current navigation state immediately. After that, it's notified whenever the state changes.

listener: The observer to use. Unregisters any existing listener if null.
flags: Flags for optional features that should be enabled for the listener.

Request

Name	Type
`listener`	`client_end:NavigationEventListener?`
`flags`	`NavigationEventListenerFlags`

SetNavigationPolicyProvider

Sets the navigation policy provider for the Frame. When set, the Frame sends NavigationPolicyProvider.EvaluateRequestedNavigation when processing navigation requests. params defines when the message is sent. After sending the EvaluateRequestedNavigation message, the Frame blocks the corresponding navigation until it receives a response.

Should be called before GetNavigationController to ensure that it is applied to all navigations including the first NavigationController.LoadURL request.

Request

Name	Type
`params`	`NavigationPolicyProviderParams`
`provider`	`client_end:NavigationPolicyProvider`

SetPermissionState

Sets the permission state for the specified permission and web_origin. By default, all permissions are denied.

Request

Name	Type
`permission`	`PermissionDescriptor`
`web_origin`	`Url`
`state`	`PermissionState`

SetPopupFrameCreationListener

Sets the listener for handling popup frame opened by web content. If no listener is present, then any new popup frame will be blocked.

listener: The listener to use. Unregisters any existing listener if null.

Request

Name	Type
`listener`	`client_end:PopupFrameCreationListener?`

SetUrlRequestRewriteRules

Supplies a set of UrlRequestRewriteRule to apply on every subsequent URL request.

rules are cumulative and applied in order.
rules are only applied on the first URL request in a redirect chain.
rules will be validated before being applied. If rules are invalid, the Frame will be closed with ERR_INVALID_ARGS.
Frame.SetUrlRequestRewriteRules must not be called again until its acknowledgement callback has been processed. If this happens, the Frame will be closed with ERR_BAD_STATE.

Request

Name	Type
`rules`	`vector<UrlRequestRewriteRule>:4096`

Response

<EMPTY>

FrameHost

Defined in fuchsia.web/context.fidl

Used by Context clients to delegate Frame hosting capabilities to selected peers.

CreateFrameWithParams

Behaves identically to Context.CreateFrameWithParams.

Request

Name	Type
`params`	`CreateFrameParams`
`frame`	`server_end:Frame`

MessagePort

Defined in fuchsia.web/frame.fidl

Represents one end of an HTML5 MessageChannel. Can be used to send and exchange Messages with the peered MessagePort in the Frame's script context. The port is destroyed when either end of the MessagePort channel is torn down.

PostMessage

Sends a WebMessage to the peer. These are processed in order, one at a time. It is not necessary for the caller to wait for the completion callback before calling MessagePort.PostMessage again.

If an error occurred, the FrameError will be set to one of these value:

BUFFER_NOT_UTF8: The script in message's data property is not UTF-8 encoded.
NO_DATA_IN_MESSAGE: The data property is missing in message.

Request

Name	Type
`message`	`WebMessage`

Response

Name	Type
`payload`	`MessagePort_PostMessage_Result`

ReceiveMessage

Asynchronously reads the next message from the channel. The client should invoke the callback when it is ready to process another message. Unreceived messages are buffered on the sender's side and bounded by its available resources.

Request

<EMPTY>

Response

Name	Type
`message`	`WebMessage`

NavigationController

Defined in fuchsia.web/navigation.fidl

Provides methods for controlling and querying the navigation state of a Frame.

GoBack

Tells the Frame to navigate to the previous page in its history, if any.

Request

<EMPTY>

GoForward

Tells the Frame to navigate to the next page in its history, if any.

Request

<EMPTY>

LoadUrl

Tells the Frame to navigate to a url.

url: The address to navigate to.
params: Additional parameters that affect how the resource will be loaded (e.g. cookies, HTTP headers, etc.)

If an error occurred, the NavigationControllerError will be set to one of these values:

INVALID_URL: The url parameter is invalid.
INVALID_HEADER: At least one of the headers in LoadUrlParams.headers is invalid.

Request

Name	Type
`url`	`Url`
`params`	`LoadUrlParams`

Response

Name	Type
`payload`	`NavigationController_LoadUrl_Result`

Reload

Tells the Frame to reload the current page.

Request

Name	Type
`type`	`ReloadType`

Stop

Tells the Frame to stop the current navigation if a navigation is ongoing.

Request

<EMPTY>

NavigationEventListener

Defined in fuchsia.web/navigation.fidl

Interface supplied by the embedder for receiving notifications about navigation events in a Frame.

OnNavigationStateChanged

Called immediately after Frame.SetNavigationEventListener and every time user-visible navigation state has changed. In the first call, change contains the current navigation state (empty before the first navigation request). In every following call, change will have values set for all fields that have changed at any time since the previous notification. This means that some fields may have the same value as was previously reported, for example, if they changed to some other value and back again. If a field is unset, then its value has not changed at any time since the previous notification.

Implementer must call the acknowledgement callback to receive new navigation events.

Request

Name	Type
`change`	`NavigationState`

Response

<EMPTY>

NavigationPolicyProvider

Defined in fuchsia.web/navigation.fidl

EvaluateRequestedNavigation

Called when the Frame is processing a navigation request in one of the phase(s) specified in NavigationPolicyProviderParams. Navigation is paused until the result is received. The returned NavigationDecision defines how the navigation should proceed.

Request

Name	Type
`requested_navigation`	`RequestedNavigation`

Response

Name	Type
`decision`	`NavigationDecision`

PopupFrameCreationListener

Defined in fuchsia.web/frame.fidl

OnPopupFrameCreated

Called when a Frame has created a new popup frame. Information about the popup frame, and how it was created, is provided via info. Additional popup frames are delivered after the acknowledgement callback is invoked.

Request

Name	Type
`frame`	`client_end:Frame`
`info`	`PopupFrameCreationInfo`

Response

<EMPTY>

STRUCTS

Context_GetRemoteDebuggingPort_Response

Defined in fuchsia.web/context.fidl

Field	Type	Description	Default
`port`	`uint16`		No default

Frame_AddBeforeLoadJavaScript_Response

Defined in fuchsia.web/frame.fidl

<EMPTY>

Frame_ExecuteJavaScriptNoResult_Response

Defined in fuchsia.web/frame.fidl

<EMPTY>

Frame_ExecuteJavaScript_Response resource

Defined in fuchsia.web/frame.fidl

Field	Type	Description	Default
`result`	`fuchsia.mem/Buffer`		No default

Frame_PostMessage_Response

Defined in fuchsia.web/frame.fidl

<EMPTY>

MessagePort_PostMessage_Response

Defined in fuchsia.web/frame.fidl

<EMPTY>

NavigationController_LoadUrl_Response

Defined in fuchsia.web/navigation.fidl

<EMPTY>

NoArgumentsAction

Defined in fuchsia.web/navigation.fidl

Empty struct used in NavigationDecision for actions that don't hav any arguments.

<EMPTY>

ENUMS

AllowInputState strict

Type: int32

Defined in fuchsia.web/frame.fidl

Controls whether Frame.ConfigureInputTypes() should allow or deny processing of the specified InputTypes.

Name	Value	Description
ALLOW	`1`
DENY	`2`

AutoplayPolicy strict

Type: int32

Defined in fuchsia.web/context.fidl

Specifies the policy for automatic (non user-initiated) playback of video and audio content.

Name	Value	Description
ALLOW	`1`	All media is permitted to autoplay.
REQUIRE_USER_ACTIVATION	`2`	Allow autoplay when the document has received a user activation. This can be the result of user action or LoadUrlParams.was_user_activated being set.

ConsoleLogLevel strict

Type: int32

Defined in fuchsia.web/frame.fidl

Name	Value	Description
NONE	`100`	No logging.
DEBUG	`-1`	Outputs messages from `console.debug()` and above levels.
INFO	`0`	Outputs messages from `console.log()`, `console.info()` and above levels.
WARN	`1`	Outputs messages from `console.warn()` and `console.error()`.
ERROR	`2`	Outputs messages from `console.error()`.

ContextError strict

Type: int32

Defined in fuchsia.web/context.fidl

Name	Value	Description
REMOTE_DEBUGGING_PORT_NOT_OPENED	`1`	The remote debugging service was not opened.

ErrorDetail flexible

Type: uint32

Defined in fuchsia.web/navigation.fidl

Indicates the reason for the error when page_type is set to PageType.ERROR.

Added: 25

Name	Value	Description
LOAD_FAILED	`0`	Page has failed to load. No content is rendered.
EXPLICIT_CONTENT_BLOCKED	`1`	Tried to navigate to a site blocked by the explicit content filter. The corresponding error page is rendered, see CreateFrameParams.explicit_sites_filter_error_page.
CRASH	`2`	The renderer process has crashed. No content is rendered.

FrameError strict

Type: int32

Defined in fuchsia.web/frame.fidl

Represents the return status of a Frame method.

Name	Value	Description
INTERNAL_ERROR	`1`	An internal error occurred.
BUFFER_NOT_UTF8	`2`	The provided buffer is not UTF-8 encoded.
INVALID_ORIGIN	`3`	The Frame's URL does not match any of the origins provided by the caller.
NO_DATA_IN_MESSAGE	`4`	The required `data` property is missing from a WebMessage.

LoadUrlReason strict

Type: uint32

Defined in fuchsia.web/navigation.fidl

Characterizes the origin of a NavigationController.LoadUrl request.

Name	Value	Description
LINK	`0`	Navigation was initiated by the user following a link.
TYPED	`1`	Navigation was initiated by a user-provided URL.

NavigationControllerError strict

Type: int32

Defined in fuchsia.web/navigation.fidl

Represents the return status of a NavigationController method.

Name	Value	Description
INVALID_URL	`1`	The provided URL is invalid.
INVALID_HEADER	`2`	At least one of the provided headers was invalid.

PageType strict

Type: uint32

Defined in fuchsia.web/navigation.fidl

Characterizes the page type in a NavigationState.

Name	Value	Description
NORMAL	`0`	Regular web page.
ERROR	`1`	Error page.

PermissionState strict

Type: uint8

Defined in fuchsia.web/frame.fidl

A state for a web permission.

Name	Value	Description
DENIED	`1`	Permission is denied.
GRANTED	`2`	Permission is granted.

PermissionType strict

Type: uint16

Defined in fuchsia.web/frame.fidl

Identifies a type of permission that may be granted to a web origin.

Name	Value	Description
MICROPHONE	`1`	Permission to access microphone(s).
CAMERA	`2`	Permission to access camera(s).
PROTECTED_MEDIA_IDENTIFIER	`3`	Permission to use device identifier(s) for EME.
PERSISTENT_STORAGE	`4`	Permission to use persistent storage.

ReloadType strict

Type: uint32

Defined in fuchsia.web/navigation.fidl

Characterizes the type of reload.

Name	Value	Description
PARTIAL_CACHE	`0`	Reloads the current entry, bypassing the cache for the main resource.
NO_CACHE	`1`	Reloads the current entry, bypassing the cache entirely.

UrlRequestAction strict

Type: int32

Defined in fuchsia.web/url_request_rewrite_rules.fidl

Name	Value	Description
ALLOW	`1`	Allow the request to be processed.
DENY	`2`	Block the request.

TABLES

ContentAreaSettings

Defined in fuchsia.web/frame.fidl

Settings for the web content in the Frame. Popup Frames created by the Frame will have their settings initialized to the Frame's current settings.

Ordinal	Field	Type	Description
1	`hide_scrollbars`	`bool`	Specifies whether scrollbars are hidden for the Frame. If omitted, the default is false.
2	`autoplay_policy`	`AutoplayPolicy`	Specifies the autoplay policy for the Frame. If omitted, the default policy is `REQUIRE_USER_ACTIVATION`.
3	`theme`	`fuchsia.settings/ThemeType`	Specifies the color theme reported to web content via the `prefers-color-scheme` media query. Valid inputs are `LIGHT`, `DARK`, and `DEFAULT`. If omitted, the default is LIGHT theme. Specifying `DEFAULT` means using the system settings, and requires that the Context have the fuchsia.settings.Display service. If the service is not available, the Frame will disconnect with `ZX_ERR_INVALID_ARGS`.
4	`page_scale`	`float32`	Sets scale factor (zoom level) that should be applied to web content rendered in this frame. Values above 1.0 make all web content (including text and images) larger, while values below 1.0 will make it smaller. In other words, values above 1.0 are used to zoom in and values below 1.0 zoom out. The overall ratio between physical pixel and CSS pixel is a product of the scale set with this method and the scale provided by Scenic (see fuchsia.ui.gfx.Metrics). That product is visible to the web content as `window.devicePixelRatio`. If omitted, the default is 1.0. This setting does not have any effect on the size of the view on the screen and the resolution at which the view is rendered. Native (non-web) UI elements, such as default scroll bars and default mouse cursor, are not scaled. User may zoom the page further when pinch-zoom is enabled (see InputTypes.GESTURE_PINCH).

ContentDirectoryProvider resource

Defined in fuchsia.web/context.fidl

Defines a provider which hosts resources from a fuchsia.io/Directory. Content can GET resource files via the provider, but not enumerate directories. Resources can be accessed by their URLs: fuchsia-dir://<provider-name>/<path/to/resource>

By default the MIME types of files are determined automatically by "sniffing" the contents of the files. No content encoding will be declared, which browsers will interpret as meaning "text/plain".

Content type and encoding metadata may optionally be specified explicitly by metadata files, which reside alongside the file. Metadata is expressed in JSON files, named after the files they describe with a "._metadata" suffix.

For example, the file "index.html" would have the a metadata file called "index.html._metadata", with the following contents:

{
  "charset": "utf-8",
  "mime": "text/html"
}

Ordinal	Field	Type	Description
1	`name`	`string:255`	Name of the provider. Must be non-empty and composed solely of alphanumerics, dots, and dashes.
2	`directory`	`client_end:fuchsia.io/Directory`	Directory containing the files served by this provider.

Defined in fuchsia.web/cookie.fidl

Ordinal	Field	Type	Description
1	`id`	`CookieId`	A table with fields to identify a cookie.
2	`value`	`string`	The cookie value. RFC6265 does not specify an upper limit on cookie size, but recommends that at least 4096 bytes are supported.

CookieId

Defined in fuchsia.web/cookie.fidl

Ordinal	Field	Type	Description
1	`name`	`CookieName`	An RFC2616 "token" chosen by the site to identify the cookie.
2	`domain`	`string:255`	The RFC1034 "subdomain" to which this cookie is scoped. e.g. "example.com" allows access from all *.example.com sub-domains.
3	`path`	`string:65536`	The URL "path" prefix to which this cookie is scoped. e.g. "/" allows access from all paths.

CreateContextParams resource

Defined in fuchsia.web/context.fidl

Parameters specifying the configuration for a new Context.

Ordinal	Field	Type	Description
1	`service_directory`	`client_end:fuchsia.io/Directory`	Service directory to be used by the context. The following services must be present in the service directory: fuchsia.buildinfo/Provider fuchsia.device/NameProvider fuchsia.fonts/Provider fuchsia.hwinfo.Product fuchsia.intl/PropertyProvider fuchsia.kernel/VmexResource (unless ContextFeatureFlags.DISABLE_DYNAMIC_CODE_GENERATION is set) fuchsia.logger/LogSink fuchsia.memorypressure/Provider fuchsia.process/Launcher fuchsia.sysmem/Allocator The following services are recommended to be present in order to allow CPU scheduling profiles to be applied to threads to tune their performance, especially for media rendering. fuchsia.media.ProfileProvider (requirement will be removed in 2025) fuchsia.scheduler.RoleManager The following services must be present in order to render web content in a Scenic view using Frame.CreateView, Frame.CreateViewWithViewRef or Frame.CreateView2]: fuchsia.accessibility.semantics/SemanticsManager fuchsia.ui.composition/Allocator fuchsia.ui.composition/Flatland fuchsia.ui.scenic/Scenic The following service must be present in order to collect diagnostic tracing data. fuchsia.tracing.perfetto.ProducerConnector
2	`data_directory`	`client_end:fuchsia.io/Directory`	Handle to the directory that will contain the Context's persistent data. If it is left unset, then the created Context will be stateless, with all of its data discarded upon Context destruction. If set, `data_directory` must not be shared with any other Context.
3	`user_agent_product`	`string:128`	Optional string describing the embedding product to append to the User-Agent string. See the specification for the HTTP User-Agent header. Requires that `user_agent_version` is also specified.
4	`user_agent_version`	`string:128`	Optional version for the embedding product to append to the User-Agent string. Requires that `user_agent_product` is also specified.
5	`remote_debugging_port`	`uint16`	Enables Frames to be created with remote debugging enabled using the DevTools protocol. If `port` is 0, then an ephemeral port will be used, which can be queried via the Context.GetRemoteDebuggingPort API. Because remote debugging uses TCP, it is not valid to set a remote debugging port without having also set ContextFeatureFlags.NETWORK for the context.
6	`content_directories`	`vector<ContentDirectoryProvider>:100`	List of providers whose contents will be served by `fuchsia-dir://` URLs.
7	`features`	`ContextFeatureFlags`	Optional features that should be enabled for this context. Some features may also require additional services in `service_directory`.
8	`playready_key_system`	`string:128`	Enables PlayReady CDM for the Context using the specified string as a key system string. The string should be a reverse domain name, as required by EME API. Requires fuchsia.media.drm/PlayReady service. Requires that a `cdm_data_directory` be specified in CreateContextParams.
9	`unsafely_treat_insecure_origins_as_secure`	`vector<UrlSchemeAndHostName>:100`	Treat given insecure origins as secure origins. For the definition of secure contexts, see Secure Contexts and origin trustworthiness. Example value: `{"http://a.com", "http://b.com"}`.
10	`cors_exempt_headers`	`vector<fuchsia.net.http/HeaderName>`	Specifies a set of header names for which Cross-Origin Resource Sharing (CORS) checks should not be enforced.
11	`cdm_data_directory`	`client_end:fuchsia.io/Directory`	Specifies the storage to use to persistent content licensing related data (e.g. provisioning data, persistent session data). By default these data will be placed under the `data_directory`, if specified. If neither `data_directory` nor `cdm_data_directory` are specified, then content licensing features requiring persistent storage (e.g. persistent licensing sessions) will not be available to the Context. Note that not all content licensing systems support persistent sessions, regardless of whether persistent storage is provided.
12	`cdm_data_quota_bytes`	`uint64`	Specifies a target maximum size for `cdm_data_directory` contents, in bytes. If the amount of persisted CDM data exceeds this threshold, then the Context will attempt to purge some data to meet the specified quota.
13	`data_quota_bytes`	`uint64`	Specifies a target maximum size for `data_directory` contents, in bytes. The Context will attempt to limit browsing state (e.g. cookies, LocalStorage) to not exceed the specified size.

CreateFrameParams resource

Defined in fuchsia.web/context.fidl

Parameters specifying the configuration for a new Frame.

Ordinal	Field	Type	Description
1	`enable_remote_debugging`	`bool`	Set to true to enable remote debugging. The Frame will be closed with `ERR_INVALID_ARGS` if `remote_debugging_port` was not set in CreateContextParams.
2	`debug_name`	`string`	Set to give the Frame a name to help distinguish it in debug contexts , such as system log output. For example, the name may be added to messages from web content when they are logged to the system logger. The name does not affect user- or web-visible behavior. Popup Frames created by the Frame will have a name derived from the parent Frame's name.
4	`explicit_sites_filter_error_page`	`fuchsia.mem/Data`	Enables automatic blocking of navigations to explicit sites, and specifies the error page content, in HTML, to be loaded in the Frame when a navigation is canceled by the filter. Applies to navigations in all frames within the Frame. When navigation of the main document is canceled, the Frame's NavigationState.PageType is `ERROR`. If set to an empty buffer, a default error message will be displayed. If set and such filtering is not supported, the Frame will disconnect with `ZX_ERR_NOT_SUPPORTED`.

CreateView2Args resource

Defined in fuchsia.web/frame.fidl

Args for Frame.CreateView2(), see above.

Ordinal	Field	Type	Description
1	`view_creation_token`	`fuchsia.ui.views/ViewCreationToken`	Non-optional. This token is provided to attach the client's Flatland view to the parent's viewport.

Favicon resource

Defined in fuchsia.web/navigation.fidl

Used to represent a favicon for a page. An empty table (all fields are unset) is used to indicate that the page doesn't have a favicon.

Ordinal	Field	Type	Description
1	`data`	`fuchsia.mem/Buffer`	The image content encoded as an RGBA bitmap with premultiplied alpha channel. The data is densely packed, so the stride is always `4 * width` and the total size is `4 * width * height`.
2	`width`	`uint32`	The width of the image.
3	`height`	`uint32`	The height of the image.

FrameCloseRequest

Defined in fuchsia.web/frame.fidl

Ordinal	Field	Type	Description
1	`timeout`	`zx/Duration`	Optional.

FrameMediaSettings

Defined in fuchsia.web/frame.fidl

Ordinal	Field	Type	Description
1	`renderer_usage`	`fuchsia.media/AudioRenderUsage`	The fuchsia.media/AudioRenderUsage to set for every fuchsia.media/AudioRenderer instance created by the Frame. If not set, the usage is `COMMUNICATION` for WebRTC streams and `MEDIA` for all other streams.
2	`audio_consumer_session_id`	`uint64`	When set, enables usage of fuchsia.media/AudioConsumer for audio playback. In that case the specified value is passed to fuchsia.media/SessionAudioConsumerFactory.

LoadUrlParams resource

Defined in fuchsia.web/navigation.fidl

Additional parameters for modifying the behavior of NavigationController.LoadUrl.

Ordinal	Field	Type	Description
1	`type`	`LoadUrlReason`	Provides a hint to the browser UI about how NavigationController.LoadUrl was triggered.
2	`referrer_url`	`Url`	The URL that linked to the resource being requested.
3	`was_user_activated`	`bool`	Should be set to true to propagate user activation to the frame. User activation implies that the user is interacting with the web frame. It enables some web features that are not available otherwise. For example, autoplay will work only when this flag is set to true.
4	`headers`	`vector<fuchsia.net.http/Header>`	Custom HTTP headers. RFC7540 does not specify a limit on the number nor size of headers.

NavigationPolicyProviderParams

Defined in fuchsia.web/navigation.fidl

Used to specify which navigation events should be delegated to NavigationPolicyProvider.

Ordinal	Field	Type	Description
1	`main_frame_phases`	`NavigationPhase`	Specifies the set of navigation phases in the main frame that should be evaluated.
2	`subframe_phases`	`NavigationPhase`	Specifies the set of navigation phases in subframes that should be evaluated.

NavigationState resource

Defined in fuchsia.web/navigation.fidl

Contains information about the Frame's navigation state.

Ordinal	Field	Type	Description
1	`url`	`Url`	The page's URL.
2	`title`	`string`	The user-visible page title. While W3C style recommendation is that HTML TITLE tags not exceed 64 characters in length, there is no actual limit.
3	`page_type`	`PageType`	Indicates whether this was a navigation to an error page.
4	`can_go_forward`	`bool`	Indicates if there is a following navigation.
5	`can_go_back`	`bool`	Indicates if there is a previous navigation.
6	`is_main_document_loaded`	`bool`	Indicates that the main document's statically declared resources have been loaded.
7	`favicon`	`Favicon`	Current favicon for the page. The field is set only when the `FAVICON` flag is set for the `NavigationEventListener` and the favicon has changed.
8	`error_detail`	`ErrorDetail`	Indicates type of the error when `page_type` is set to `ERROR`. Added: 25

PermissionDescriptor

Defined in fuchsia.web/frame.fidl

Describes a web permission. In the future, it may be extended with type-specific fields.

Ordinal	Field	Type	Description
1	`type`	`PermissionType`

PopupFrameCreationInfo resource

Defined in fuchsia.web/frame.fidl

Specifies additional information about a newly created popup frame.

Ordinal	Field	Type	Description
1	`initial_url`	`Url`	The URL to which the popup frame was initially navigated.
2	`initiated_by_user`	`bool`	Set if the popup frame was created in response to UI interaction from the user (e.g. a link was clicked).

RequestedNavigation

Defined in fuchsia.web/navigation.fidl

Ordinal	Field	Type	Description
1	`id`	`NavigationId`	Unique ID of the navigation.
2	`phase`	`NavigationPhase`	Current navigation phase. Exactly one bit will be set.
3	`is_main_frame`	`bool`	Whether the navigation is taking place in the main frame versus in a subframe.
4	`is_same_document`	`bool`	Whether the navigation happened without changing the document.
5	`is_http_post`	`bool`	Whether the navigation is a POST request.
6	`url`	`Url`	The current target URL of the navigation. This may change for the same navigation after encountering a server redirect.
7	`has_gesture`	`bool`	Whether the navigation was initiated by a user gesture.
8	`was_server_redirect`	`bool`	Whether the navigation has encountered a server redirect or not.

UrlRequestRewriteAddHeaders

Defined in fuchsia.web/url_request_rewrite_rules.fidl

Adds headers to the URL request. If a header is already present in the original URL request, it will be overwritten.

headers must be set.
Each fuchsia.net.http/Header in headers must have a valid HTTP header name and value, per RFC 7230 section 3.2.

Ordinal	Field	Type	Description
1	`headers`	`vector<fuchsia.net.http/Header>:4096`

UrlRequestRewriteAppendToQuery

Defined in fuchsia.web/url_request_rewrite_rules.fidl

Appends query to the URL's query. If the URL request already has a query, query will be appended to it, preceded by &. Otherwise, the URL's query will be set to query.

query must be set.
query must be a valid URL-query string.

Ordinal	Field	Type	Description
1	`query`	`Url`

UrlRequestRewriteRemoveHeader

Defined in fuchsia.web/url_request_rewrite_rules.fidl

If query_pattern is in the URL's query, removes header_name from the list of headers. If query_pattern is not set, removes header_name from the list of headers unconditionally.

header_name must be set.
header_name must be a valid HTTP header name, per RFC 7230 section 3.2.

Ordinal	Field	Type	Description
1	`query_pattern`	`Url`
2	`header_name`	`fuchsia.net.http/HeaderName`	Added: 12

UrlRequestRewriteReplaceUrl

Defined in fuchsia.web/url_request_rewrite_rules.fidl

If the URL in the URL request ends with url_ends_with, rewrites the URL to new_url.

url_ends_with and new_url must be set.
url_ends_with must be a valid path-relative-URL string.
new_url must be a valid URL string.

Ordinal	Field	Type	Description
1	`url_ends_with`	`Url`
2	`new_url`	`Url`

UrlRequestRewriteRule

Defined in fuchsia.web/url_request_rewrite_rules.fidl

Ordinal	Field	Type	Description
1	`hosts_filter`	`vector<UrlHostName>:4096`	Set of hosts to apply the rules to. If not set, the rule will apply to every request, independent of host.
2	`schemes_filter`	`vector<UrlSchemeName>:4096`	Set of schemes to apply the rules to. If not set, the rule will apply to every request, independent of scheme.
3	`rewrites`	`vector<UrlRequestRewrite>:4096`	URL request rewrites to apply.
4	`action`	`UrlRequestAction`	Specifies the action to take for requests matching the filter criteria. Requests are allowed by default.

UrlRequestRewriteSubstituteQueryPattern

Defined in fuchsia.web/url_request_rewrite_rules.fidl

If pattern is found in the URL's query, replaces it with substitution.

pattern and substitution must be set.
substitution must be a valid URL-query string.

Ordinal	Field	Type	Description
1	`pattern`	`Url`
2	`substitution`	`Url`

WebMessage resource

Defined in fuchsia.web/frame.fidl

Ordinal	Field	Type	Description
1	`data`	`fuchsia.mem/Buffer`	The message payload, encoded as an UTF-8 string. This is a required property.
2	`incoming_transfer`	`vector<IncomingTransferable>`	Optional list of objects transferred into the MessagePort from the FIDL client.
3	`outgoing_transfer`	`vector<OutgoingTransferable>`	Optional list of objects transferred out of the MessagePort to the FIDL client.

UNIONS

Context_GetRemoteDebuggingPort_Result strict

Defined in fuchsia.web/context.fidl

Ordinal	Variant	Type	Description
1	`response`	`Context_GetRemoteDebuggingPort_Response`
2	`err`	`ContextError`

Frame_AddBeforeLoadJavaScript_Result strict

Defined in fuchsia.web/frame.fidl

Ordinal	Variant	Type	Description
1	`response`	`Frame_AddBeforeLoadJavaScript_Response`
2	`err`	`FrameError`

Frame_ExecuteJavaScriptNoResult_Result strict

Defined in fuchsia.web/frame.fidl

Ordinal	Variant	Type	Description
1	`response`	`Frame_ExecuteJavaScriptNoResult_Response`
2	`err`	`FrameError`

Frame_ExecuteJavaScript_Result strict resource

Defined in fuchsia.web/frame.fidl

Ordinal	Variant	Type	Description
1	`response`	`Frame_ExecuteJavaScript_Response`
2	`err`	`FrameError`

Frame_PostMessage_Result strict

Defined in fuchsia.web/frame.fidl

Ordinal	Variant	Type	Description
1	`response`	`Frame_PostMessage_Response`
2	`err`	`FrameError`

IncomingTransferable flexible resource

Defined in fuchsia.web/frame.fidl

Ordinal	Variant	Type	Description
1	`message_port`	`client_end:MessagePort`

MessagePort_PostMessage_Result strict

Defined in fuchsia.web/frame.fidl

Ordinal	Variant	Type	Description
1	`response`	`MessagePort_PostMessage_Response`
2	`err`	`FrameError`

NavigationController_LoadUrl_Result strict

Defined in fuchsia.web/navigation.fidl

Ordinal	Variant	Type	Description
1	`response`	`NavigationController_LoadUrl_Response`
2	`err`	`NavigationControllerError`

NavigationDecision strict resource

Defined in fuchsia.web/navigation.fidl

Navigation action that should be taken in response to a navigation request. Returned from NavigationPolicyProvider.EvaluateRequestedNavigation.

Ordinal	Variant	Type	Description
1	`proceed`	`NoArgumentsAction`	Navigation should proceed normally.
2	`abort`	`NoArgumentsAction`	Navigation should be aborted. The frame should stay on the current page.

OutgoingTransferable flexible resource

Defined in fuchsia.web/frame.fidl

Ordinal	Variant	Type	Description
1	`message_port`	`server_end:MessagePort`

UrlRequestRewrite flexible

Defined in fuchsia.web/url_request_rewrite_rules.fidl

Ordinal	Variant	Type	Description
1	`add_headers`	`UrlRequestRewriteAddHeaders`	Adds a set of headers to a URL request.
2	`remove_header`	`UrlRequestRewriteRemoveHeader`	Removes a header based on the presence of a pattern in the URL's query.
3	`substitute_query_pattern`	`UrlRequestRewriteSubstituteQueryPattern`	Substitutes a pattern in the URL's query.
4	`replace_url`	`UrlRequestRewriteReplaceUrl`	Replaces a URL if the original URL ends with a pattern.
5	`append_to_query`	`UrlRequestRewriteAppendToQuery`	Appends to the URL's query.

BITS

ContextFeatureFlags strict

Type: uint64

Defined in fuchsia.web/context.fidl

Feature flags that allow augmenting Context behavior. Some features require additional services in the service directory provided during context initialization. See CreateContextParams.service_directory.

Name	Value	Description
NETWORK	1	Enables network access. Requires the following services: fuchsia.net.interfaces/State fuchsia.net.name/Lookup fuchsia.posix.socket/Provider
AUDIO	2	Enables audio input and output. Requires the following services: fuchsia.media/Audio fuchsia.media/AudioDeviceEnumerator fuchsia.media/SessionAudioConsumerFactory
VULKAN	4	Enables GPU-accelerated rendering of the web content. Requires the following services: fuchsia.vulkan.loader/Loader The following service is required in order to collect Vulkan trace data. fuchsia.tracing.provider.Registry
HARDWARE_VIDEO_DECODER	8	Enables hardware video decoding. ContextFeatureFlags.VULKAN must be enabled as well. Requires the following service: fuchsia.mediacodec/CodecFactory
HARDWARE_VIDEO_DECODER_ONLY	16	Disables video codecs that cannot be decoded in hardware. Software decoders will only be used as fallbacks for hardware decoders, such as when insufficient resources are available. Requires ContextFeatureFlags.HARDWARE_VIDEO_DECODER.
WIDEVINE_CDM	32	Enables Widevine CDM modules for EME API. ContextFeatureFlags.VULKAN must be enabled as well. Requires fuchsia.media.drm/Widevine service. Requires that a `cdm_data_directory` be specified in CreateContextParams.
HEADLESS	64	Allows embedders to render web content without graphical output or Scenic. Not compatible with ContextFeatureFlags.VULKAN.
LEGACYMETRICS	128	Report telemetry data to the fuchsia.legacymetrics/MetricsRecorder.
KEYBOARD	256	Enables input events for keyboard keypresses. Requires fuchsia.ui.input3/Keyboard, from which the events are obtained.
VIRTUAL_KEYBOARD	512	Enables the use of onscreen virtual keyboards. The implementation will manage the state of the keyboard in response to input/focus events in web content. Requires the fuchsia.input.virtualkeyboard/ControllerCreator service and ContextFeatureFlags.KEYBOARD.
DISABLE_DYNAMIC_CODE_GENERATION	1024	Disables dynamic generation of machine-code from scripts (e.g. JavaScript) and other technologies (e.g. WebAssembly). This should typically result in scripts being executed by an interpreter, with associated loss in performance. Other technologies relying on dynamic code generation may be provided in a limited form where feasible, or unavailable if interpreting would render them unusable (as is likely the case for WebAssembly). fuchsia.kernel/VmexResource is not required if this option is set. Added: 10

InputTypes strict

Type: uint64

Defined in fuchsia.web/frame.fidl

Identifies the types of input events which may be handled by a View.

Name	Value	Description
KEY	1	Keyboard events.
MOUSE_CLICK	2	Mouse button events, for any button.
MOUSE_WHEEL	4	Mouse scroll wheel events.
MOUSE_MOVE	8	Mouse movement events.
GESTURE_TAP	16	Single tapping with one finger.
GESTURE_PINCH	32	Pinching (for zooming).
GESTURE_DRAG	64	Dragging a finger (for scrolling).
ALL	9223372036854775808	Matches all input types.

NavigationEventListenerFlags strict

Type: uint64

Defined in fuchsia.web/frame.fidl

Flags clients can set when connecting a NavigationEventListener to indicates interest in optional features.

Name	Value	Description
FAVICON	1	Enables `favicon` field in NavigationState.

NavigationPhase strict

Type: uint32

Defined in fuchsia.web/navigation.fidl

Identifies a navigation phase.

Name	Value	Description
START	1	Navigation is being started.
REDIRECT	2	Navigation was redirected.
PROCESS_RESPONSE	4	Navigation response is being processed. At this point navigation hasn't been committed yet, so it is not too late to cancel it.
FAIL	8	Navigation has failed.

CONSTANTS

Name	Value	Type
MAX_HEADERS_COUNT	`4096`	`int32`
MAX_HOST_LENGTH	`255`	`int32`
MAX_RULE_COUNT	`4096`	`int32`
MAX_SCHEME_AND_HOST_LENGTH	`513`	`int32`
MAX_URL_LENGTH	`65536`	`int32`
MAX_URL_SCHEME_NAME_LENGTH	`255`	`int32`

ALIASES

Name	Value	Description
CookieName	`string`[`fidl/MAX`]
NavigationId	`uint64`	Unique identifier of a navigation. Can be used to correlate different phases for the same navigation. Guaranteed to be unique for all navigations in the same Context.
Url	`string`[`MAX_URL_LENGTH`]
UrlHostName	`string`[`MAX_HOST_LENGTH`]
UrlSchemeAndHostName	`string`[`MAX_SCHEME_AND_HOST_LENGTH`]
UrlSchemeName	`string`[`MAX_URL_SCHEME_NAME_LENGTH`]