Atrahasis SE with HTTP, WebSocket, SSE & GraphQL

The core API client supports four protocols in one workspace.

Protocols

• HTTP/1.1, HTTP/2, and HTTP/3 (QUIC) with automatic negotiation
• WebSocket — connect, send, subscribe, per-frame timestamps, message history
• Server-Sent Events (SSE) — live stream with auto-reconnect and event filtering
• GraphQL — query/mutation editor with introspection and variables

Requests

• GET/POST/PUT/PATCH/DELETE and custom methods
• JSON, form, multipart, raw, and binary bodies
• Headers, query params, and path variables

Auth

• OAuth 2.0, Bearer token, Basic auth, API Key

Scripting

• Pre-request and post-response scripts (Processors)
• at.request / at.response to read and mutate requests and responses
• Set environment and flow variables from scripts

Inspect & validate

• Request tracing waterfall — DNS, TCP, TLS, server response, download
• Built-in assertions — status, headers, body, JSON path, response time
• TLS / certificate inspection

Workspace

• Environments, cookie jar, and named sessions that persist across runs
• Request history