CORS issue with DEEPL on localhost

[cp-bwg]

When I attempt a translation using a deepL key when in astro dev, running in browser on localhost, the translation service fails due to a cors issue.

Access to fetch at 'https://api-free.deepl.com/v2/translate?text=we&text=wqe&source_lang=EN&target_lang=ES&tag_handling=html&split_sentences=1&auth_key=**[REDACTED]** from origin 'http://localhost:4321' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.Understand this error
deepl.js:177

GET https://api-free.deepl.com/v2/translate?text=we&text=wqe&source_lang=EN&target_lang=ES&tag_handling=html&split_sentences=1&auth_key=**[REDACTED]** net::ERR_FAILED 200 (OK)
translate @ deepl.js:177
rP @ update.js:274
onclick @ translate-button.svelte:54
Hu @ events.js:253Understand this error
update.js:290 TypeError: Failed to fetch
at Object.translate (deepl.js:177:11)
at rP (update.js:274:50)
at HTMLButtonElement.onclick [as __click] (translate-button.svelte:54:7)
at HTMLDivElement.Hu (events.js:253:17)
rP @ update.js:290
await in rP
onclick @ translate-button.svelte:54
Hu @ events.js:253Understand this error

[kyoshino]

Will check.

[kyoshino]

Can confirm the issue. Previously their CORS policy only applied to POST requests, so Sveltia CMS has used GET requests. It seems the undocumented workaround is no longer working.

The possible solution would be:

• Use a proxy. It could be part of Sveltia CMS Authenticator but you have to install a worker on Cloudflare anyway.
• Move to another service: Google, Amazon, Microsoft, ChatGPT, etc. That’s probably easier.

I’ll look into the second option.

[cp-bwg]

deepL is the definitive best, in my opinion. Could this be solved by adding headers to the request? I don’t mind setting up a proxy or if you have additional info on how to handle that. Whatever you decide - thank you for the support.

…

________________________________ From: Kohei Yoshino ***@***.***> Sent: Wednesday, June 25, 2025 5:04:45 PM To: sveltia/sveltia-cms ***@***.***> Cc: Brad Gregory ***@***.***>; Author ***@***.***> Subject: Re: [sveltia/sveltia-cms] CORS issue with DEEPL on localhost (Issue #437) [https://avatars.githubusercontent.com/u/2929505?s=20&v=4]kyoshino left a comment (sveltia/sveltia-cms#437)<#437 (comment)> Can confirm the issue. Previously their CORS policy<https://developers.deepl.com/docs/best-practices/cors-requests> only applied to POST requests, so Sveltia CMS has used GET requests. It seems the undocumented workaround is no longer working. The possible solution would be: * Use a proxy. It could be part of Sveltia CMS Authenticator<https://github.com/sveltia/sveltia-cms-auth> but you have to install a worker on Cloudflare anyway. * Move to another service: Google, Amazon, Microsoft, ChatGPT, etc. That’s probably easier. I’ll look into the second option. — Reply to this email directly, view it on GitHub<#437 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/ANSC2WJBGU4E42OEZZSHBN33FMMH3AVCNFSM6AAAAACABPFYHGVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTAMBWGM3TINZSGI>. You are receiving this because you authored the thread.Message ID: ***@***.***>

[kyoshino]

I use DeepL Write every day and use DeepL Translate sometimes. I know their quality is great. But this cannot be solved on the client side. It’s a problem with DeepL, and I don’t understand why they have such a CORS policy from the beginning.

I’ll replace DeepL with Google Translate for now, and develop a DeepL proxy later.

[kyoshino]

DeepL is replaced with Google in v0.82.0

[cp-bwg]

Thanks man!

…

________________________________ From: Kohei Yoshino ***@***.***> Sent: Wednesday, June 25, 2025 8:58 PM To: sveltia/sveltia-cms ***@***.***> Cc: Brad Gregory ***@***.***>; Author ***@***.***> Subject: Re: [sveltia/sveltia-cms] CORS issue with DEEPL on localhost (Issue #437) [https://avatars.githubusercontent.com/u/2929505?s=20&v=4]kyoshino left a comment (sveltia/sveltia-cms#437)<#437 (comment)> DeepL is replaced with Google in v0.82.0<https://github.com/sveltia/sveltia-cms/releases/tag/v0.82.0> — Reply to this email directly, view it on GitHub<#437 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/ANSC2WORW5CMOCPTCZTYUSD3FNHT3AVCNFSM6AAAAACABPFYHGVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTAMBWG43DQOJTGU>. You are receiving this because you authored the thread.Message ID: ***@***.***>

[kyoshino]

Added GPT in v0.97.0.