| 技术 \ 场景 | 单次请求 | 流式接收 | 长轮询 | 全双工 | 只发不收 |
|---|---|---|---|---|---|
| XHR | ✓ | ✓ readyState 3 | ✓ | — | — |
| Fetch | ✓ | ✓ ReadableStream | ✓ | — | — |
| EventSource | — | ✓ 服务器推 | — | — | — |
| iframe | — | ✓ Forever Frame | — | — | — |
| WebSocket | — | ✓ 双向 | — | ✓ | — |
| WebTransport | — | ✓ 多流 | — | ✓ HTTP/3 | — |
| HTTP/2 Push | — | 已移除 | — | — | 曾推资源 |
| JSONP | ✓ <script> | — | — | — | — |
| Beacon | — | — | — | — | ✓ sendBeacon |
| Image | — | — | — | — | ✓ <img src> |