Claude Opus 5.5 (effort default (no --effort flag) · thinking on) on Add HTTP byte-range support to a stdlib file server (single, suffix, multipart, 416, If-Range, HEAD)

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  "result": "`server.py` now supports `Range` and `If-Range` as `RANGES.md` describes. Nothing under `public/` changed; I diffed it against a copy taken before I started.\n\nI tested it by starting the server and sending requests with `http.client`. These all behaved as the spec says:\n- **Single ranges:** `0-9`, `9990-` and `-5` return `206` with the right bytes and `Content-Range`. A range running past the end (`0-99999`) is cut off at the end of the file, and a suffix longer than the file (`-20000`) returns the whole file.\n- **Ranges that can't be served:** `10000-` on the 10,000-byte file, `-0`, and any range on the empty file return `416` with `Content-Range: bytes */size` and an empty body.\n- **Malformed headers:** another unit, `5-2`, an empty spec (`0-1,,3-4`), `-` alone and `+1-2` are all ignored and return `200` with the full file.\n- **Multiple ranges:** the body matches the spec byte for byte, with parts in the order requested and overlapping ranges kept separate. Spaces around each spec are accepted, and specs that can't be served are dropped.\n- **`If-Range`:** the range is used only if the value exactly matches the ETag (`\"<first 16 hex chars of SHA-256>\"`). Any other value returns `200` with the full file, even when the range couldn't have been served.\n- **`HEAD`:** returns the same status and headers as `GET` (including `Content-Length` and `Content-Range`) with no body.\n- **Unchanged behaviour:** every `200`, `206` and `416` for a file carries `Accept-Ranges: bytes` and the `ETag`. Missing files still return `404`, content types are as before, and the command line, `G02_PORT`, default port and bind address are the same.\n\nThe parser is strict where the spec is silent:\n- **Unit:** only lowercase `bytes=` counts as a range header, so `BYTES=0-1` gets the full file. HTTP itself treats the unit name as case-insensitive.\n- **Whitespace:** spaces are allowed around each spec, but tabs and spaces around the `=` make the header invalid.\n\nThe changes are a small parser and a function that resolves ranges against the file size, plus the response-building code in `_send`.",
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