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Showing content from https://playwright.dev/python/docs/api/class-websocket below:

WebSocket | Playwright Python

WebSocket

The WebSocket class represents WebSocket connections within a page. It provides the ability to inspect and manipulate the data being transmitted and received.

If you want to intercept or modify WebSocket frames, consider using WebSocketRoute.

Methods expect_eventAdded before v1.9 webSocket.expect_event

Waits for event to fire and passes its value into the predicate function. Returns when the predicate returns truthy value. Will throw an error if the webSocket is closed before the event is fired. Returns the event data value.

Usage

web_socket.expect_event(event)
web_socket.expect_event(event, **kwargs)

Arguments

event str #

Event name, same one would pass into webSocket.on(event).
predicate Callable (optional)#

Receives the event data and resolves to truthy value when the waiting should resolve.
timeout float (optional)#

Maximum time to wait for in milliseconds. Defaults to 30000 (30 seconds). Pass 0 to disable timeout. The default value can be changed by using the browser_context.set_default_timeout().

Returns

EventContextManager #

wait_for_eventAdded before v1.9 webSocket.wait_for_event

Waits for given event to fire. If predicate is provided, it passes event's value into the predicate function and waits for predicate(event) to return a truthy value. Will throw an error if the socket is closed before the event is fired.

Usage

web_socket.wait_for_event(event)
web_socket.wait_for_event(event, **kwargs)

Arguments

event str #

Event name, same one typically passed into *.on(event).
predicate Callable (optional)#

Receives the event data and resolves to truthy value when the waiting should resolve.
timeout float (optional)#

Maximum time to wait for in milliseconds. Defaults to 30000 (30 seconds). Pass 0 to disable timeout. The default value can be changed by using the browser_context.set_default_timeout().