Network

Network I/O

The Network I/O subsystem mimics the standards found on the web. The following API surfaces are available:

• Web Sockets

  • XD Documentation
  • MDN documentation

• XMLHttpRequest

  • XD Documentation
  • MDN documentation

• Fetch

  • XD Documentation
  • MDN documentation

Web Socket Support

The entire web socket API is supported, except for extensions handling.

XMLHttpRequest Support

Most of the XHR API surface is supported, including:

• Setting request headers

• Getting response headers

• Event handling

• Sending text and binary data

  • Text is expected to be UTF8 encoded.
  • Binary data must use ArrayBuffer, not Blob

Unsupported portions of the surface:

• responseURL
• Sending / receiving Blobs is not supported
• Synchronous XHR will throw an error

Fetch Support

Fetch is polyfilled on top of the XHR implementation using https://github.com/github/fetch.