Server Header Analyzer
Analyze any Server HTTP response header to identify the web server software, detect exposed version numbers and OS information, and get security recommendations for hiding server version. Our tool supports Nginx, Apache, IIS, Caddy, LiteSpeed, and 15+ other server products - all processing happens locally in your browser, no signup required.
Paste any Server header value to identify the web server software, detect exposed version and OS information, and get security recommendations for hardening your server configuration.
Paste the value of the Server HTTP response header you want to analyze
All analysis is performed locally in your browser. No data is sent to any server.
Why Use Our Server Header Analyzer?
Instant Server Software Detection
Paste any Server header value and instantly identify the web server software - whether it's Nginx, Apache, IIS, Caddy, LiteSpeed, OpenResty, or 15+ other server products. Our pattern-matching engine recognizes header formats from major server vendors worldwide.
Security Exposure Assessment
Get an immediate security assessment of your Server header. The tool detects whether version numbers and OS information are exposed, which can help attackers identify vulnerable software versions for targeted exploitation attempts.
Actionable Security Recommendations
Receive step-by-step recommendations for hiding version information in your Server header, tailored to your specific server software. Each recommendation includes exact configuration file paths and directives for Nginx, Apache, IIS, Caddy, and more.
Server-Specific Hardening Guides
Access detailed vulnerability notes for your detected server software, including known CVEs and security best practices. Learn how to harden your server configuration with specific commands, configuration snippets, and security checklists.
Common Use Cases for Server Header Analyzer
Security Audit & Hardening
Use the Server Header Analyzer during security audits to identify web servers leaking version or OS information. A Server header that exposes version details helps attackers find known CVEs and craft targeted exploits against your infrastructure.
Penetration Testing & Reconnaissance
During penetration testing, analyze Server headers to gather intelligence about target web servers. Identifying the exact server software and version helps testers prioritize vulnerability testing based on known CVEs and published exploits.
Server Inventory & Discovery
Map out the server software running across your infrastructure by collecting and analyzing Server headers from your web applications, APIs, CDN edge nodes, and microservices. Identify legacy or unauthorized server installations.
Compliance & Best Practices
Meet security compliance requirements (PCI DSS, SOC 2, ISO 27001, HIPAA) that mandate information disclosure minimization. The Server Header Analyzer helps verify that your servers are not leaking unnecessary technical details.
DevSecOps CI/CD Pipeline Integration
Incorporate Server header analysis into your CI/CD pipeline. Automatically verify that new deployments and server configurations do not expose version information before they reach production environments.
Security Documentation & Reporting
Generate detailed security reports about your server headers for documentation, audit trails, and management overviews. Copy the complete analysis report with findings and recommendations for compliance records.
Understanding the Server Header
What Is the Server Header?
The Server HTTP response header is a response header that reveals the software and version used by the origin server that processed the request. Defined in RFC 7231 Section 7.4.2, it typically contains the server product name, optionally followed by a version number and supplementary details like the operating system. For example, nginx/1.24.0 tells clients the server is Nginx version 1.24.0, while Apache/2.4.57 (Ubuntu) reveals the server is Apache 2.4.57 running on Ubuntu Linux.
How Our Server Header Analyzer Works
- Paste the Header Value: Copy the Server header value from your browser\'s Developer Tools (Network tab), a cURL response, or any HTTP client. Paste it into the input field and click "Analyze Header".
- Pattern Matching: Our analyzer compares your header value against a comprehensive database of known server product signatures. It identifies the server software, extracts version numbers using regular expressions, and detects any OS information enclosed in parentheses.
- Security Assessment: Based on what information is exposed (server name only, name + version, or name + version + OS), we generate a security rating - Secure, Warning, or Critical - along with actionable, server-specific recommendations for hardening your configuration.
What Information Can Be Exposed
- Server Name: The basic product name (e.g., "nginx", "Apache", "cloudflare"). This is generally considered acceptable and difficult to hide completely from determined adversaries.
- Version Number: The software version (e.g., "1.24.0", "2.4.57"). This is the most security-critical information to hide, as attackers use version numbers to identify known vulnerabilities and target exploits accordingly.
- OS Information: Platform details in parentheses (e.g., "(Ubuntu)", "(Windows)", "(Debian)"). This narrows down the attack surface and helps attackers craft OS-specific exploits or use OS-specific attack vectors.
- Module Extensions: Some servers append module information (e.g., "ModSecurity", "OpenSSL/3.0.0"). These can reveal additional attack surface and should be minimized for production environments.
Privacy, Security & Availability
Our Server Header Analyzer processes everything locally in your browser. The Server header values you paste are never sent to our servers - all analysis, pattern matching, and recommendation generation happens client-side. The tool is 100% free with no signup, no account, and no usage limits. We support analysis of 15+ major server products including Nginx, Apache, IIS, Caddy, LiteSpeed, Tomcat, OpenResty, Lighttpd, Cloudflare, Cowboy, Jetty, GWS, Amazon S3/CloudFront, Node.js frameworks, and GitHub Pages, with comprehensive security guidance for each.
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Frequently Asked Questions About Server Header Analyzer
The Server HTTP response header is a response header that identifies the software used by the origin server that handled the request. It typically includes the server product name and may include version numbers and OS details. For example, "nginx/1.24.0" tells clients the server is Nginx version 1.24.0.
Exposing your server version helps attackers identify which specific vulnerabilities (CVEs) apply to your software. If a known vulnerability exists in Apache 2.4.49 and your Server header shows "Apache/2.4.49", attackers know exactly which exploit to try. Hiding the version number adds a layer of security through obscurity and reduces your attack surface.
Some servers allow complete removal of the Server header, while others only allow hiding the version number. Nginx allows removal via `server_tokens off;` (shows "nginx" without version). Apache uses `ServerTokens Prod` (shows "Apache"). Some CDNs and cloud services manage the Server header automatically and cannot be customized by end users.
Open your browser's Developer Tools (F12), go to the Network tab, reload the page, and click on any request. Look for the "Server" header in the Response Headers section. You can also use cURL: `curl -I https://example.com` to see all response headers including the Server header.
No. Hiding the Server header is a good security practice but should be part of a defense-in-depth strategy. You should also keep your server software updated, use HTTPS with strong ciphers, implement security headers (HSTS, CSP, X-Frame-Options), use a Web Application Firewall (WAF), and follow other security best practices.
Our Server Header Analyzer supports 15+ major server products: Nginx, Apache HTTP Server, Microsoft IIS, Cloudflare, OpenResty, Caddy, Lighttpd, LiteSpeed, Tomcat, Node.js (Express/Koa), Google Web Server (GWS), GitHub Pages, Amazon S3/CloudFront, Cowboy, and Jetty. It also provides generic guidance for unrecognized server software.
The analyzer uses pattern matching against known Server header formats from major server vendors. It reliably identifies well-known servers like Nginx, Apache, and IIS. For custom or obscure server software, it falls back to a generic analysis with best-practice security recommendations.
Yes! Our Server Header Analyzer is 100% free with no signup, no account, and no usage limits. All analysis happens locally in your browser - your Server header values are never sent to any server.