Protocols & Extensions Comparison

Feature	VS Code	JetBrains	httpyac	VS 2022	kulala
GraphQL via X-REQUEST-TYPE header	✓	✗	✗	✗	✗
GraphQL via GRAPHQL keyword	✗	✓	✗	✗	✓
GraphQL auto-detection	✗	✗	✓	✗	✗
WebSocket JetBrains: WEBSOCKET keyword. httpyac: WS/WSS keyword.	✗	✓	✓	✗	✓
gRPC httpyac supports all four RPC types.	✗	✓	✓	✗	✓
Server-Sent Events JetBrains: via script processing. httpyac: SSE/EVENTSOURCE keyword.	✗	◐	✓	✗	✗
MQTT Unique to httpyac.	✗	✗	✓	✗	✗
AMQP/RabbitMQ Unique to httpyac.	✗	✗	✓	✗	✗

GraphQL: three approaches

Approach	Client
X-REQUEST-TYPE: GraphQL header	VS Code REST Client
GRAPHQL method keyword	JetBrains, kulala.nvim
Auto-detection in POST body	httpyac

These are mutually incompatible. There is no portable GraphQL syntax.

Protocol support tiers

Widely Supported Supported by 3+ implementations, possibly with syntax variations.

WebSocket — supported by JetBrains (WEBSOCKET), httpyac (WS/WSS), and kulala.nvim. Different keywords but similar functionality.

Widely Supported Supported by 3+ implementations, possibly with syntax variations.

gRPC — supported by JetBrains, httpyac, and kulala.nvim. httpyac offers the most complete support with all four RPC types.

Implementation-Specific Unique to a single implementation. Not portable.

SSE, MQTT, AMQP — httpyac only. These protocol extensions are not available in any other client.