[pull] dev from plotly:dev

[pull]

See Commits and Changes for more details.

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Created by pull[bot]

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[sourcery-ai]

Reviewer's Guide by Sourcery

This PR adds request context data (cookies, headers, path, remote address, and origin) to the callback context, making it accessible in both regular and background callbacks. The implementation includes new properties in the CallbackContext class and modifications to how context is handled in background callbacks.

Sequence diagram for setting and using cookies in callbacks

sequenceDiagram
    actor User
    participant App as Dash App
    participant Callback as Callback Function
    User->>App: Click 'set-cookies' button
    App->>Callback: Trigger set_cookies callback
    Callback->>App: Set cookie 'bg-cookie'
    User->>App: Click 'use-cookies' button
    App->>Callback: Trigger use_cookies callback
    Callback->>App: Retrieve 'bg-cookie' from cookies
    App->>User: Display 'cookie-value' in output

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Updated class diagram for CallbackContext

classDiagram
    class CallbackContext {
        +cookies
        +headers
        +path
        +remote
        +origin
    }
    note for CallbackContext "New properties added to access request context data."

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File-Level Changes

Change	Details	Files
Added new request context properties to CallbackContext	Added cookies property to access request cookies Added headers property to access request headers Added path property to access full request path Added remote property to access remote address Added origin property to access request origin Created helper function _get_from_context for property access	dash/_callback_context.py
Modified background callback context handling	Simplified context value creation by copying entire context Removed manual context attribute copying Added cleanup of background-specific context attributes	dash/_callback.py
Added request context initialization in dispatch	Added cookies initialization from flask request Added headers initialization from flask request Added path, remote, and origin initialization from flask request	dash/dash.py
Added integration tests for new context features	Created test app for cookies in background callbacks Added test case for setting and retrieving cookies	tests/integration/long_callback/app_ctx_cookies.py tests/integration/long_callback/test_ctx_cookies.py

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