HTTP Post Message

The `http-post-message` package provides a generic messaging component to facilitate HTTP-style communication over the `window.postMessage` API. It abstracts the raw `postMessage` mechanics into familiar HTTP methods like `get`, `post`, `put`, `patch`, and `delete`, allowing developers to send structured requests and receive responses with HTTP semantics (e.g., status codes, headers). The current stable version is `0.3.0`. It does not implement the underlying `postMessage` transport itself but requires an external implementation of an `IPostMessage` interface, most commonly fulfilled by the `window-post-message-proxy` library, which Microsoft also maintains. Its key differentiator is bringing a robust, HTTP-like request/response pattern to cross-window and cross-iframe communication, simplifying complex messaging scenarios.