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Cors Configurator

Category: Security  ·  Sub-category: web-security  ·  Last updated:
type:debug
Diagnose and fix a failing cross-origin browser request — read the exact console error, work out whether it's a simple or preflighted request, and set the minimal correct Access-Control-* response headers (including the wildcard-with-credentials trap and the OPTIONS preflight) on the server. Use when the browser blocks a fetch/XHR with a CORS error but the API itself works from curl or Postman.
Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

Fix the specific, maddening case where a request works from curl or Postman but the browser blocks it with a CORS error. CORS is enforced by the browser, not the server — so the failure is always that the server isn't returning the response headers the browser requires for a cross-origin request. This skill reads the exact error, determines what the browser is asking for, and sets the minimal correct headers on the server, without disabling the protection or opening the API to every origin.

What this skill does

Cors Configurator is a community-contributed Claude Code skill in the web-security sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/cors-configurator/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when the browser blocks a fetch/XHR with a CORS error but the API itself works from curl or Postman.

Who uses this skill

The Cors Configurator Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 154,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/cors-configurator
curl -L https://claudskills.com/skills/cors-configurator/SKILL.md \
  -o ~/.claude/skills/cors-configurator/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/cors-configurator/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/cors-configurator/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\cors-configurator\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Cors Configurator Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/cors-configurator/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Cors Configurator skill do?
Diagnose and fix a failing cross-origin browser request — read the exact console error, work out whether it's a simple or preflighted request, and set the minimal correct Access-Control-* response headers (including the wildcard-with-credentials trap and the OPTIONS preflight) on the server. Use when the browser blocks a fetch/XHR with a CORS error but the API itself works from curl or Postman.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Cors Configurator skill?
Use Cors Configurator when your Claude Code task falls under the Security category — specifically in the web security area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Cors Configurator" or describe the task and let Claude pick). Browse related skills at /category/security/.
What is a Claude Code skill and how does the Cors Configurator skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Cors Configurator is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
imtiazrayhan. (2026). Cors Configurator [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/cors-configurator/
BibTeX
@misc{cors-configurator-2026,
  author    = {imtiazrayhan},
  title     = {Cors Configurator [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/cors-configurator/}
}

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Security scan

Grade A · scanned 2026-07-19 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

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