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_docs/02_document/modules/loader_http_client.md

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+# Module: loader_http_client
+
+## Purpose
+
+HTTP client for downloading and uploading model files (and other binary resources) via an external Loader microservice.
+
+## Public Interface
+
+### Class: LoadResult
+
+Simple result wrapper.
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `err` | str or None | Error message if operation failed |
+| `data` | bytes or None | Response payload on success |
+
+### Class: LoaderHttpClient
+
+| Method | Signature | Description |
+|--------|-----------|-------------|
+| `__init__` | `(str base_url)` | Stores base URL, strips trailing slash |
+| `load_big_small_resource` | `(str filename, str directory) -> LoadResult` | POST to `/load/{filename}` with JSON body `{filename, folder}`, returns raw bytes |
+| `upload_big_small_resource` | `(bytes content, str filename, str directory) -> LoadResult` | POST to `/upload/{filename}` with multipart file + form data `{folder}` |
+| `stop` | `() -> None` | No-op placeholder |
+
+## Internal Logic
+
+Both load/upload methods wrap all exceptions into `LoadResult(err=str(e))`. Errors are logged via loguru but never raised.
+
+## Dependencies
+
+- **External**: `requests`, `loguru`
+- **Internal**: none (leaf module)
+
+## Consumers
+
+- `inference` — downloads ONNX/TensorRT models, uploads converted TensorRT engines
+- `main` — instantiates client with `LOADER_URL`
+
+## Data Models
+
+- `LoadResult` — operation result with error-or-data semantics
+
+## Configuration
+
+- `base_url` — provided at construction time, sourced from `LOADER_URL` environment variable in `main.py`
+
+## External Integrations
+
+| Integration | Protocol | Endpoint Pattern |
+|-------------|----------|-----------------|
+| Loader service | HTTP POST | `/load/{filename}` (download), `/upload/{filename}` (upload) |
+
+## Security
+
+None (no auth headers sent to loader).
+
+## Tests
+
+None found.