__  __    __   __  _____      _            _          _____ _          _ _ 
 |  \/  |   \ \ / / |  __ \    (_)          | |        / ____| |        | | |
 | \  / |_ __\ V /  | |__) | __ ___   ____ _| |_ ___  | (___ | |__   ___| | |
 | |\/| | '__|> <   |  ___/ '__| \ \ / / _` | __/ _ \  \___ \| '_ \ / _ \ | |
 | |  | | |_ / . \  | |   | |  | |\ V / (_| | ||  __/  ____) | | | |  __/ | |
 |_|  |_|_(_)_/ \_\ |_|   |_|  |_| \_/ \__,_|\__\___| |_____/|_| |_|\___V 2.1
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Support for streaming http requests in emscripten.

A few caveats -

If your browser (or Node.js) has WebAssembly JavaScript Promise Integration enabled
https://github.com/WebAssembly/js-promise-integration/blob/main/proposals/js-promise-integration/Overview.md
*and* you launch pyodide using `pyodide.runPythonAsync`, this will fetch data using the
JavaScript asynchronous fetch api (wrapped via `pyodide.ffi.call_sync`). In this case
timeouts and streaming should just work.

Otherwise, it uses a combination of XMLHttpRequest and a web-worker for streaming.

This approach has several caveats:

Firstly, you can't do streaming http in the main UI thread, because atomics.wait isn't allowed.
Streaming only works if you're running pyodide in a web worker.

Secondly, this uses an extra web worker and SharedArrayBuffer to do the asynchronous fetch
operation, so it requires that you have crossOriginIsolation enabled, by serving over https
(or from localhost) with the two headers below set:

    Cross-Origin-Opener-Policy: same-origin
    Cross-Origin-Embedder-Policy: require-corp

You can tell if cross origin isolation is successfully enabled by looking at the global crossOriginIsolated variable in
JavaScript console. If it isn't, streaming requests will fallback to XMLHttpRequest, i.e. getting the whole
request into a buffer and then returning it. it shows a warning in the JavaScript console in this case.

Finally, the webworker which does the streaming fetch is created on initial import, but will only be started once
control is returned to javascript. Call `await wait_for_streaming_ready()` to wait for streaming fetch.

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Return true if jspi can be used.

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to be in the correct state - i.e. that the javascript
call into python was async not sync.

:return: True if jspi can be used.
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Check if we are in Node.js.

:return: True if we are in Node.js.
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