// Create a simple ReadableStream
const stream = new ReadableStream({
  start(controller) {
    // Push some data into the stream
    controller.enqueue(new TextEncoder().encode("Hello, "));
    controller.enqueue(new TextEncoder().encode("this is a streamed request!"));
    controller.close(); // Close the stream
  },
});

// Use fetch with the ReadableStream as the body
fetch('https://httpbin.org/post', {
  method: 'POST',
  headers: {
    'Content-Type': 'text/plain',
  },
  body: stream,
  duplex: 'half', // This is required for streaming requests
})
  .then((response) => {
    if (!response.ok) {
      throw new Error(`HTTP error! Status: ${response.status}`);
    }
    return response.json();
  })
  .then((data) => {
    console.log('Response from server:', data.data);
  })
  .catch((error) => {
    console.error('Fetch error:', error);
  });

% nvm run v18.0.0 test.js                                                                                                                                                                               1 ↵ ✭
Running node v18.0.0 (npm v8.6.0)
(node:38648) ExperimentalWarning: The Fetch API is an experimental feature. This feature could change at any time
(Use `node --trace-warnings ...` to show where the warning was created)
Response from server: Hello, this is a streamed request!