Security Headers Scanner

Security Headers Scanner, a tool created by our specialists that analyzes the HTTP response headers of a website to verify if proper security measures are implemented at the browser level.

You can test any type of website. If not all tests are valid and the security percentage is not A+, it means you have security issues.

Benefits of Security Headers for Websites

HTTP security headers are instructions sent by the web server to the visitor’s browser, telling it how to behave when interacting with your site. Proper configuration of these headers represents one of the most effective methods to protect a website against cyber attacks, without affecting performance or user experience.

1. Content-Security-Policy (CSP)

What it does: Controls what resources (scripts, images, styles, fonts) can be loaded on the site’s pages.

Benefits:

• Prevents Cross-Site Scripting (XSS) attacks, one of the most common web vulnerabilities
• Blocks injection of malicious code from unauthorized external sources
• Reduces the risk of defacement (unauthorized modification of the site’s visible content)
• Provides granular control over each category of resources

2. Strict-Transport-Security (HSTS)

What it does: Forces the browser to access the site exclusively through secure HTTPS connections.

Benefits:

• Eliminates the possibility of man-in-the-middle attacks through insecure HTTP redirects
• Protects data transmitted between user and server (passwords, forms, personal data)
• Increases visitor trust by ensuring a permanent encrypted connection
• Contributes positively to SEO score, as Google favors HTTPS sites

3. X-Frame-Options

What it does: Controls whether the site can be loaded in an iframe on another domain.

Benefits:

• Prevents clickjacking attacks, where users are tricked into clicking on hidden elements
• Protects authentication forms and sensitive pages from being framed in malicious sites
• Ensures that site content is displayed only in the intended context

4. X-Content-Type-Options

What it does: Prevents the browser from “guessing” (MIME sniffing) the content type of a file.

Benefits:

• Prevents execution of malicious code disguised in apparently harmless files (for example, a script hidden in an image)
• Reduces the attack surface for vulnerabilities based on file type misinterpretation
• Easy to implement (a single configuration line)

5. Referrer-Policy

What it does: Controls what information is transmitted in the Referer header when the user navigates from your site to another site.

Benefits:

• Protects user confidentiality by limiting information shared with third parties
• Prevents leakage of internal URLs or sensitive parameters (tokens, session IDs)
• Offers flexibility: you can choose the level of information shared based on context

6. Permissions-Policy (formerly Feature-Policy)

What it does: Restricts access to browser functionalities like camera, microphone, geolocation or sensors.

Benefits:

• Prevents unauthorized access to user devices (camera, microphone)
• Blocks third-party scripts (ads, widgets) from using sensitive functions
• Strengthens visitor confidentiality and GDPR compliance

7. X-XSS-Protection

What it does: Activates the built-in anti-XSS filter in the browser (relevant mainly for older browsers).

Benefits:

• Provides an additional layer of protection against reflected XSS attacks
• Works as a safety net for browsers that don’t yet fully support CSP
• Simple implementation, with no impact on site functionality

8. Cross-Origin Headers (COOP, COEP, CORP)

What it does: Controls how site resources interact with other origins (domains).

Benefits:

• Protects against Spectre attacks and other side-channel vulnerabilities
• Isolates the site’s browsing context, preventing unauthorized access from other tabs or windows
• Allows safe use of advanced functionalities like SharedArrayBuffer

General Benefits of Implementing Security Headers

• Proactive protection — Headers act as an additional defense layer, independent of application code.
• Positive SEO impact — Google and other search engines consider site security as a ranking factor.
• GDPR compliance — Demonstrates adequate technical measures for personal data protection.
• Increased trust — Visitors and clients have more confidence in a properly secured site.
• Low implementation cost — Headers are configured at the server level, without modifications to the site’s source code.
• Universal compatibility — All modern browsers respect these security headers.

For assistance in implementing security headers or for professional SEO optimization services, contact GOAI Promovare from Alba Iulia at 0754 308 781 or by email at contact@goai.ro.