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DeepL Free API (No TOKEN required)
e74d34e7ab
Two related stability issues hit during real-world use:
1. **Hung requests** — without an explicit timeout the upstream HTTP
call could dangle indefinitely on a stuck connection. Browser
extensions calling /translate would sit on a spinner forever with
no error to surface to the user (reported in the field).
2. **No-feedback on oversized input** — the oneshot endpoint caps the
total text length at 1500 characters (matches the extension's own
\`G.notLoggedIn = 1500\` constant). We were forwarding the request
anyway and letting DeepL 400 it, which a) wasted an upstream round
trip and b) the caller had no way to distinguish from other 400s.
Changes:
- Pre-validate \`text\` length in characters (utf8.RuneCountInString,
not byte length — verified the cap is rune-based: 1500 Chinese
characters / 4500 bytes is accepted, 1501 is rejected). Return
HTTP 413 Payload Too Large with a clear message naming both the
observed length and the limit.
- Set a 20s timeout on the oneshot HTTP client (req.SetTimeout).
On timeout return HTTP 504 Gateway Timeout — distinguishes a slow
DeepL from other 503 failure modes (DNS, TLS, etc.). The check
catches both context.DeadlineExceeded and url.Error{Timeout()=true}.
- Set a separate 5s timeout on the cookie-jar warmup GET to
www.deepl.com. Warmup is best-effort; we'd rather a slow warmup
(cookies still seed eventually next time) than block the very first
translation behind a hung GET.
Behaviour verified against the live oneshot endpoint:
- 1500 ASCII chars → 200
- 1501 ASCII chars → 413 (upstream not contacted)
- 1500 Chinese chars (4500 bytes) → 200
- 1501 Chinese chars → 413
- Pathological "your"*1500 → 504 at 20s (was hanging without timeout)
- Realistic 245-char Chinese → 200 in ~13s
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|---|---|---|
| .github | ||
| img | ||
| service | ||
| translate | ||
| .cross_compile.sh | ||
| .gitignore | ||
| compose.yaml | ||
| deeplx.service | ||
| Dockerfile | ||
| go.mod | ||
| go.sum | ||
| install.sh | ||
| LICENSE | ||
| main.go | ||
| me.missuo.deeplx.plist | ||
| README.md | ||
| uninstall.sh | ||
How to use
!TIP] Learn more about [📘 Using DeepLX](https://deeplx.owo.network) by checking it out.
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