Free X-Content-Type-Options Checker
Free tool
Check whether your responses send X-Content-Type-Options: nosniff to block MIME sniffing attacks, with copy-paste fixes for Nginx, Apache, and Express.
- Nosniff presence
- MIME sniffing risks
- Fix guidance
No credit card requiredProduction-safe (100% passive)No setup or code required
Trusted by 3,500+ security & engineering teams
What you get for free
18 core security checks via this tool, passive scans, step-by-step remediation, security score on every result.
What Essential adds at $39/mo
+17 advanced checks, continuous monitoring, daily security score history, email alerts, GitHub SAST, board-ready PDFs, SOC 2 / ISO 27001 / PCI reports.
What is X-Content-Type-Options?
Setting nosniff disables MIME type sniffing and forces browsers to obey the declared Content-Type, reducing XSS vectors.
How to enable nosniff
- Add header: X-Content-Type-Options: nosniff
- Serve correct Content-Type for all assets
Implementation examples
Once you've identified the gap, applying the fix is straightforward. Here are the three configurations developers reach for most often.
Nginx
add_header X-Content-Type-Options "nosniff" always;Apache
Header always set X-Content-Type-Options "nosniff"Node.js (Express + Helmet)
import helmet from "helmet"
app.use(helmet.noSniff())Tool-specific questions
Does nosniff break anything?
It can expose mislabelled Content-Types. Fix incorrect MIME types rather than removing nosniff.
Should APIs use nosniff?
Yes - apply universally for consistent protection.
Why Barrion
Built for the engineers who already have enough to fix.
Speed
Real-time results
Instant analysis with a detailed report. You see findings as the scan runs, not after.
Coverage
Comprehensive checks
35+ checks per scan covering TLS, headers, CORS, cookies, DNS, email auth, and more, in a single pass.
Action
Step-by-step fixes
Every finding ships with the exact remediation step for your framework. Hand it to the engineer who owns the surface.
Other tools
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Related guides
Go deeper on the same topic.
Learn
X Content Type Options
Per-check explainer covering what it is, why it matters, and how Barrion verifies it.
Fix guide
Missing X Content Type Options
Step-by-step remediation with config examples for Nginx, Apache, and Node.
Guide
Security Headers Guide
Long-form implementation guide from the Barrion engineering blog.
FAQ
Frequently asked.
What is Barrion and how does it enhance website security?
Barrion is a security testing and monitoring platform for engineering teams, covering three products: passive DAST that continuously watches your live web apps and APIs, SAST via GitHub that scans your codebase for secrets, insecure patterns and vulnerable dependencies, and AI pentesting that runs active, agent-driven attacks with proof-of-exploit. Findings come with step-by-step fixes you can ship immediately.
How safe is Barrion to use for security testing?
Every default Barrion scan is 100% passive and read-only. We never submit forms, brute-force endpoints or interact with state-changing routes, so it's safe to run against production.
What types of security issues does Barrion identify?
Barrion is a security testing and monitoring platform, so coverage spans three surfaces. Passive DAST flags misconfigurations across TLS/HTTPS, security headers, cookie flags, CORS policy, DNS records, email authentication (SPF/DKIM/DMARC), network exposure and common web hygiene issues. SAST via GitHub finds secrets in code, insecure patterns and vulnerable dependencies. AI pentesting adds exploitable findings like SQL injection, XSS and broken access control with proof-of-exploit.
What specific security checks does Barrion perform?
Barrion checks TLS/HTTPS configuration, HTTP security headers, cookie flags, CORS policy, DNS and email authentication records, network exposure and common web hygiene issues, then prioritises them by severity with clear remediation.
What is Barrion's smart crawling?
Smart crawling automatically discovers the pages and endpoints of your app so scans cover the surface that matters, without you manually listing every URL.
How often does Barrion perform security scans?
Manual scans on demand. Continuous monitoring runs automatically on Essential (weekly+) and Business (daily), and alerts you the moment a new issue appears.
Is Barrion suitable for security testing of all business sizes?
Yes. Barrion is a security testing and monitoring platform, with passive DAST, SAST via GitHub and AI pentesting available to solo developers, startups, scale-ups and enterprise security teams alike, without adding headcount.
How does Barrion handle data security and privacy during security testing?
Scans are passive and read-only by default, and we never store or expose sensitive data from your application. Pentests are rate-limited and non-destructive, designed to confirm exploitability without altering data or affecting availability.
What if I'm not satisfied with Barrion's security testing service?
Paid plans start with a free trial, and you can cancel anytime. If something isn't right, contact us and we'll make it work for your team.
How does Barrion help with SOC 2, ISO 27001, NIS2, and other compliance frameworks?
Barrion produces audit-ready PDF and CSV reports suitable for SOC 2, ISO 27001, PCI DSS and NIS2, ready to share with auditors, customers and your board.
Anything else? Email contact@barrion.io.
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