httpPostJson (llm/fetcher.ts)

Robust HTTP client for LLM providers with retries and error mapping.

// Source: https://github.com/MemTensor/MemOS | License: Apache-2.0 | Copyright You must retain, in the Source form of any Derivative Works
// Provided via justclaw.it.com; keep this notice with the code.
/**
 * HTTP helpers for LLM providers.
 *
 * Similar in spirit to `core/embedding/fetcher.ts`, but LLM calls differ:
 *   - Retries on 5xx / 429 / transient network errors with exponential backoff.
 *   - Timeouts are per-call, not per-request, so streaming can take minutes.
 *   - Errors are mapped to `llm_unavailable` / `llm_rate_limited` /
 *     `llm_timeout` — the client cares which one it is.
 *   - A small SSE decoder is provided for providers that return
 *     `text/event-stream` (openai_compatible, anthropic).
 */

import { ERROR_CODES, MemosError } from "../../agent-contract/er

... (truncated -- full source via MCP)