Hi Klever team,
we’ve been loading the ESM build of the Klever Web SDK from sdk.kleverscan.org for a while. Starting today, browsers began blocking it with a CORS error, even though nothing changed on our side.
Our site (origin): https://playklever.games
SDK URL (previously): https://sdk.kleverscan.org/kleverchain-sdk-web-esm-1-0-x.js
Errors we see
Access to script at ‘``https://sdk.kleverscan.org/kleverchain-sdk-web-esm-1-0-x.js’
from origin ‘``https://playklever.games``’ has been blocked by CORS policy:
No ‘Access-Control-Allow-Origin’ header is present on the requested resource.
and:
GET ``https://sdk.kleverscan.org/kleverchain-sdk-web-esm-1-0-x.js`` net::ERR_FAILED 200 (OK)
DevTools details
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Script is loaded as ES module ( type="module") → fetched in CORS mode.
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Response is 200 OK, Content-Type: application/javascript.
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No Access-Control-Allow-Originheader on the response (and none on redirect hops).
- 
Result: browsers drop the response post-fetch. 
To keep production stable, we’ve switched to self-hosting the file under our own domain (same-origin), i.e.:
import { web } from ‘/vendor/klever/kleverchain-sdk-web-esm-1-0-x.js’;
Questions:
- 
Did you change CDN/headers or caching rules on sdk.kleverscan.orgfor the ESM build?
- 
Is there an official, stable distribution path (CDN or npm) you recommend for the web ESM build? 
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Could you restore/add the required CORS headers (at least Access-Control-Allow-Origin: *or per-origin) so cross-origin module loading works again?
- 
Do you provide versioning, changelogs, and checksums (e.g., semver tags, release notes, SHA256) so we can safely self-host and know when updates happen? 
- 
Is there a preferred import (package name + entry file) we should use if we migrate to npm bundling? 
What we need for reliability
- 
A stable URL or npm package entry for the web ESM build. 
- 
Correct CORS headers on CDN responses for ESM usage. 
- 
Changelog & versioning so we can decide when to update our self-hosted copy. 
Happy to provide full header screenshots or a minimal repro if needed. Thanks in advance for clarifying!
Greetings
Andreas
