If your 3kh0 mirror or wrapper is showing a blank screen, Cloudflare challenge, “about:blank,” or 404 errors, the root cause is almost always misconfigured DNS, SSL/CORS issues, proxy rewriting, or broken asset links. The fixes involve properly configuring your hosting, headers, proxy logic, and “ext remover” scripts.

This article dives deep into common symptoms, root causes, and step-by-step solutions. You’ll learn how to recover sites blocked by Cloudflare, debug blank frames, fix missing resources, safely integrate ext remover tools, and know when the issue is client-side versus host‐side. Use this as your go-to reference when a 3kh0 clone breaks.

3kh0 Common Symptoms & Their Meanings

Before applying fixes, you need to correctly identify the symptom. Here are several common error types you’ll see with 3kh0 variants:

Cloudflare Challenge / “Checking your browser…” page

When Cloudflare is in front of your domain (via DNS proxy), visitors often see a challenge or interstitial page instead of your content. This blocks the user and prevents your mirror from functioning.

Blank / white screen (“about:blank” or no content)

This means your HTML loaded (or at least the URL resolved), but no meaningful UI appears. Could be due to broken JavaScript, failed fetch, or blocked resources.

404 / Missing Assets

Specific JS, CSS, image, or proxy endpoints result in 404s. Key resources aren’t being found, so your site fails to render or proxy logic fails.

Proxy / fetch errors

Your proxy endpoints may return “bad request,” CORS failures, connection refused, or simply timeouts. The wrapper logic that fetches external game data or content is broken.

ext remover tool not working

If your “ext remover” (or exploit / bookmarklet script) is intended to bypass security policies but fails, it might be due to HTTPS enforcement, domain restrictions, or security layers (CSP, frame-ancestors).

Once you know which category your failure falls into, you can apply the proper set of fixes.

Core Fix Strategies: Cloudflare, CORS, Referrer, Hosting Setup

Disable Cloudflare Proxy for GitHub / Pages

One common misstep is enabling Cloudflare’s proxy (the “orange cloud”) for DNS records pointing to GitHub Pages or your mirror domain. When the proxy is active, Cloudflare masks your origin and intercepts requests; GitHub cannot correctly issue SSL certificates or route traffic.

To fix it:

• In your Cloudflare DNS dashboard, locate the A / CNAME records pointing to your GitHub Pages repo or mirror domain.
  
• Toggle off the proxy (so the cloud icon becomes grey, not orange).
  
• Wait for DNS propagation and SSL certificate issuance.
  
• After the certificate is issued, you can optionally re-enable certain Cloudflare features, but never the HTTP proxy for your Pages domain.
  

This disabling is often recommended by GitHub community docs: HTTPS enforcement fails when Cloudflare proxy is on.

If you leave proxy enabled, visitors will see “Checking your browser…” or interstitial pages that break your mirror.

Check DNS & SSL Setup

If your custom domain isn’t resolving to your GitHub Pages origin IPs or is misconfigured, Cloudflare (or browser) will show blank or “not secure” pages.

Ensure you have:

• The correct A records for the apex domain pointing to GitHub’s IP addresses (e.g. 185.199.108.153 etc.)
  
• A CNAME for the www subdomain pointing to yourusername.github.io
  
• A proper CNAME file in your repository (if required) matching your custom domain
  
• HTTPS / “Enforce HTTPS” turned on only after DNS is correctly configured
  
• If hosting via Cloudflare, disable their HTTP proxy as mentioned above
  

If SSL handshake fails or the domain remains “Not Secure,” that’s often a symptom of proxy interference or incorrect DNS records. 

Inspect Browser Console & Network Logs

Open your browser DevTools (F12) → Network & Console tabs. Look for:

• 404 or 500 status codes on .js, .css, or /proxy endpoints
  
• Mixed content warnings (HTTP resources loaded on HTTPS page)
  
• CORS errors (e.g. “Access-Control-Allow-Origin missing”)
  
• CSP violations or blocked scripts
  
• Frame embedding errors (e.g. “Refused to display in a frame because it set ‘X-Frame-Options’”)
  

Often the console will directly point you to the missing asset or blocked request.

Fix CORS, Headers, and Referrer Policies

Your proxy wrapper needs to properly pass headers so that requests aren’t blocked. Key strategies:

• In your proxy server (Node / Express or similar), forward request headers such as User-Agent, Referer, Origin to mimic a real browser request.
  

Set appropriate response headers:

Access-Control-Allow-Origin: *

Access-Control-Allow-Headers: *

Access-Control-Allow-Methods: GET, POST, OPTIONS

• If adding Referrer-Policy: no-referrer or similar, test whether target endpoints rely on a referrer. Sometimes removing or relaxing the referrer helps.
  
• On static hosts, consider using a serverless proxy (e.g. via Vercel, Cloudflare Workers) to inject CORS headers around external fetches.
  
• If your embed is via iframe, ensure the target allows frame-ancestors (modify via proxy rewriting). Some games disallow being framed.
  

Clean / Rebuild: Ext Remover & Stripped Builds

The 3kh0/ext-remover project is a curated list of exploit / bypass scripts (for ChromeOS and extension bypassing). But many forks or clones try embedding ext-remover logic into their wrapper. If your ext remover script stops working (e.g. injection fails or script blocked), consider:

• Stripping server responses of any interfering CSP or sandbox headers
  
• Ensuring the script is loaded from your own domain (not external) so it isn’t blocked
  
• Embedding as inline script only after sanitizing your build
  
• Testing the script separately (simple HTML page) to isolate whether failure is in wrapper logic or script itself
  

In one discussion, users pointed out that extender or bookmarklet logic doesn’t work when Cloudflare or Vercel is used, likely because they enforce stricter HTTPS or CSP policies.

If your ext remover broke after switching hosting, roll back to a baseline version and re-integrate piecewise.

If you’re looking for a smooth gaming experience without pop-ups or ads, our article on Adfree 3kh0 Game Pages covers everything you need.

Diagnosing When Host vs Client is at Fault

It helps to know if the failure lies in your hosting setup (GitHub, Replit) or the user’s environment (network, firewall, browser).

Host-Side Failures

• The domain does not resolve at all (DNS error)
  
• SSL / handshake errors
  
• 404s on core assets
  
• Proxy endpoint refuses connections
  
• Error logs on the server side
  
• Broken CNAME or misconfigured GitHub Pages settings
  

If you see any of these, fix server, DNS, or deployment config first.

Client / Network / Browser Failures

• Page shows blank only in certain networks (e.g. school, workplace) but works elsewhere
  
• Cloudflare interstitials or “checking your browser” appear only in some locations
  
• Browser console shows blocked resource by network filter or firewall
  
• Missing or blocked ad / tracker scripts interfering
  

In such cases, the network is filtering or blocking certain domains or resource types. You may need to:

• Proxy all external requests through your own domain
  
• Use alternate domains/CDNs for assets
  
• Avoid popular ad script domains
  
• Shade request headers or use stealth techniques
  

Testing via VPN or proxy from different locations can help isolate whether the problem is local or global.

Step-by-Step Troubleshooting Workflow

Here’s a practical workflow you can follow when a 3kh0 mirror goes down or breaks.

Confirm DNS is pointing correctly

Use dig, nslookup, or DNS checkers. Ensure A / CNAME records map to GitHub or your host.

Turn off Cloudflare proxy

Set DNS entries to “DNS only” (grey cloud). Wait a few minutes and retry.

Check SSL / HTTPS

Load the domain in incognito. If SSL errors show, re-check certificate issuance or re-add the custom domain in your GitHub Pages settings.

Inspect network & console logs

Find the first failing resource. Maybe catalog.js is 404, or /proxy call fails.

Test proxy endpoint in isolation

Call /proxy?url=https://example.com (or your test URL). See if you get a valid response or error.

Adjust headers in proxy code

Add CORS headers, forward User-Agent and Referer, ensure binary encoding is properly handled (buffers vs streams).

Simplify HTML to bare minimum

Strip everything except basic layout and a test iframe. Load a simple external page via proxy. This isolates CSS/JS issues.

Reintegrate ext remover script carefully

Once core proxy + wrapper works, layer in ext remover logic. Test across networks.

Deploy incremental updates and monitor

Use versioning or staging to test before pushing full changes. Use error logging for server endpoints.

Provide fallback or mirror

If your primary fails, route traffic to an alternate mirror or fallback static page until you fix the root cause.

Real World Example: Fixing Blank Screen on 1v1.lol Mirror

Imagine your 1v1.lol 3kh0 clone shows a white screen. You inspect and see:

catalog.js returned 404
The iframe to 1v1.lol fails with CORS
/proxy?url=… returns “Network Error”

You would:

• Confirm that your catalog.js file was included in the build and pushed to the correct folder
  
• Adjust the relative path if your repo is a subpath (e.g. in project site)
  
• In your proxy server, add res.set(“Access-Control-Allow-Origin”, “*”)
  
• Forward the correct referer header to 1v1.lol
  
• Clean CSP or X-Frame-Options headers returned from the proxied page (if possible)
  
• Retry the iframe embed; if it still fails, try rewriting the fetched HTML to inline scripts & assets
  

By iterating these steps, you gradually eliminate the cause and restore your game wrapper.

Security, Ethics, & Legal Considerations

Before deploying or troubleshooting 3kh0 clones or ext remover scripts:

Check copyright / licensing: Some games may not permit redistribution or embedding.

Avoid misuse: ext remover exploits can be powerful; misuse may violate school or organizational policies.

Monitor traffic load: Proxying external content increases bandwidth and resource consumption.

Sanitize input URLs: If your proxy takes a url query parameter, validate and sanitize to avoid open proxy abuse.

Rate-limit: Prevent DDoS or flooding by limiting proxy request rates.

Use HTTPS end-to-end: Don’t downgrade requests to HTTP inadvertently.

Disable or gate ext remover logic: Only enable advanced scripts for users who need them (e.g. via toggle or password).

Be responsible. Your mirror should be built to provide resilient availability, not abuse networks or bypass security in malicious ways.

Conclusion

Facing blank screens, Cloudflare challenges, 404s, or broken ext remover logic in your 3kh0 pages can feel overwhelming — but most of these errors trace back to one of a few root causes: DNS/SSL misconfiguration, Cloudflare proxy interference, broken proxy headers, or resource path issues.

By following a reliable debugging workflow — disable Cloudflare proxy, validate DNS/SSL, inspect console logs, test proxy endpoints, adjust headers & referrers, reintroduce ext remover logic carefully — you can restore your mirror to working order. And by understanding when issues stem from the host versus the client environment, you’ll troubleshoot faster and with more confidence.

FAQs