fix: handle non-ASCII URLs and false positives in external link checker

[RiskeyL]

Summary

• Fix link checker crash on URLs with CJK characters (e.g. translated API reference paths) by URL-encoding non-ASCII characters before making requests
• Skip domains that reliably produce false positives from GitHub runners: volcengine.com (geo-restricted), twitter.com/x.com (blocks automated requests)
• Update actions/checkout from v4 to v5 to resolve Node.js 20 deprecation warning
• Fix malformed image URL in ja/use-dify/tutorials/build-ai-image-generation-app.mdx (missing closing quote)

[mintlify]

Preview deployment for your docs. Learn more about Mintlify Previews.

Project	Status	Preview	Updated (UTC)
dify-core-product	🟢 Ready	View Preview	Apr 10, 2026, 4:50 AM

💡 Tip: Enable Workflows to automatically generate PRs for you.

[Copilot]

Pull request overview

This PR updates the documentation external link checker to be more resilient (non-ASCII URL handling and fewer runner-induced false positives), adjusts the scheduled link-check workflow, and fixes a malformed image URL in Japanese docs.

Changes:

• URL-encode non-ASCII characters before making external link requests, and skip a small set of domains that are consistently unreliable from CI.
• Update the external-link-check GitHub Actions workflow to use actions/checkout@v5.
• Fix a malformed src="..." string in ja/use-dify/tutorials/build-ai-image-generation-app.mdx.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 6 comments.

File	Description
tools/check-links.py	Adds URL path encoding and expands domain skipping for external link checks.
.github/workflows/check_external_links.yml	Bumps actions/checkout to v5 for the scheduled external link check workflow.
ja/use-dify/tutorials/build-ai-image-generation-app.mdx	Fixes a broken image URL string in the Japanese tutorial.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.