This PR adds the ability to stream data into Feathers services using ReadableStream.

Changes

Client (packages/feathers/src/client/fetch.ts)

• Auto-detects ReadableStream and passes it directly to fetch
• Sets duplex: 'half' for streaming bodies
• Defaults to application/octet-stream if no Content-Type specified

Server (packages/feathers/src/http/middleware.ts)

• Streams unknown content types directly to services instead of throwing an error
• JSON and form-urlencoded are parsed as before
• Everything else passes through as a ReadableStream

Test Fixture (packages/feathers/fixtures/index.ts)

• Replaced @whatwg-node/server with native Node.js adapter
• Added StreamingService for testing

Usage

// Client - stream a file
const stream = file.stream()
await app.service('uploads').create(stream, {
  headers: {
    'Content-Type': file.type,
    'X-Filename': file.name
  }
})

// Server - pipe directly to storage
async create(stream: ReadableStream, params: Params) {
  await env.MY_BUCKET.put(params.headers['x-filename'], stream)
  return { success: true }
}

Use Cases

• Large file uploads without buffering
• Streaming data directly to S3/R2
• Real-time data ingestion (IoT, logs)
• CSV/JSON import processing row by row
• Piping uploads through a Cloudflare Worker with minimal memory usage

Compatibility

This PR is compatible with v6-form-data. When both merge, the bodyParser will handle:

1. application/json → parsed
2. application/x-www-form-urlencoded → parsed
3. multipart/form-data → parsed (from form-data PR)
4. Everything else → streamed

Breaking Changes

None. Previously unknown content types threw an error; now they stream through.