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Introduction:
In the modern web security landscape, HTTP response headers serve as the first line of defense against a wide array of attacks—from cross-site scripting (XSS) and clickjacking to information disclosure and man-in-the-middle exploits. Yet many organizations overlook these critical security controls, leaving their web applications vulnerable. Humble is a fast, security-oriented HTTP headers analyzer that automates the detection of misconfigurations, missing headers, and insecure values, providing actionable intelligence to harden your web infrastructure.
Learning Objectives:
- Understand the role of HTTP security headers in defending against modern web application attacks
- Learn how to install, configure, and operate the Humble headers analyzer across Linux and Windows environments
- Master the interpretation of Humble’s analysis reports and implement recommended security header configurations
- Integrate Humble into CI/CD pipelines for continuous security validation
- Apply advanced techniques including TLS/SSL assessment and custom header analysis
- What Is Humble and Why Your Security Posture Depends on It
Humble is an open-source HTTP headers analyzer developed by Rafa ‘Bluesman’ Faura, designed to systematically evaluate the security configuration of web servers through their HTTP response headers. Unlike basic header checkers that simply list present headers, Humble performs deep analysis across multiple dimensions: it checks for the presence of 62 security-related headers, performs 15 essential missing-header checks, runs 1,286 fingerprinting detection checks, and identifies 158 deprecated headers or insecure values.
The tool is officially recognized by both OWASP as a technical resource for the Secure Headers Project and is packaged in Kali Linux, making it a trusted component of professional security toolkits. Humble’s ability to export analyses to multiple formats (CSV, HTML5, JSON, PDF, TXT, XLSX, and XML) and its integration with testssl.sh for TLS/SSL vulnerability scanning make it an indispensable asset for security engineers, penetration testers, and DevOps teams.
- Installation and Setup: From Zero to Analysis in Five Minutes
Humble is remarkably easy to deploy across multiple platforms.
On Kali Linux (Recommended):
sudo apt update sudo apt install humble
This installs the package with all dependencies including python3-requests, python3-colorama, python3-fpdf, and python3-xlsxwriter.
On Other Linux Distributions (From Source):
git clone https://github.com/rfc-st/humble.git cd humble pip3 install -r requirements.txt
On Windows 10/11:
Humble is fully tested on Windows 10 20H2 and later. Install Python 3, then:
git clone https://github.com/rfc-st/humble.git cd humble pip install -r requirements.txt python humble.py -h
Docker Deployment:
For containerized environments, Humble can be run via Docker with persistent storage for analysis outputs:
docker pull rfcst/humble:latest docker run -v $(pwd)/output:/app/output rfcst/humble -u https://example.com -o all
- Core Usage: Running Your First Security Header Analysis
The most basic Humble command targets a single URL:
humble -u https://yourdomain.com
For a brief analysis showing only the summary:
humble -u https://yourdomain.com -b
For a detailed analysis with full HTTP response headers:
humble -u https://yourdomain.com -r
Exporting Results:
To export analysis to all supported formats:
humble -u https://yourdomain.com -o all -op /path/to/output
This generates CSV, HTML, JSON, PDF, TXT, XLSX, and XML reports.
CI/CD Integration:
For automated pipelines, use the `-cicd` flag to output only summary statistics and grade in JSON format:
humble -u https://yourdomain.com -cicd
This produces machine-parsable output suitable for Jenkins, GitLab CI, or GitHub Actions workflows.
4. Advanced Analysis Techniques: Going Beyond the Basics
TLS/SSL Assessment:
Humble integrates with testssl.sh for comprehensive TLS/SSL vulnerability scanning:
humble -u https://yourdomain.com -e /path/to/testssl.sh
This checks for outdated protocols, weak ciphers, and known vulnerabilities.
Proxy Support:
For analyzing internal or restricted endpoints:
humble -u https://internal.example.com -p http://127.0.0.1:8080
Custom Request Headers:
To simulate specific client contexts:
humble -u https://example.com -H "Host: staging.example.com" -H "X-Forwarded-For: 192.168.1.100"
Fingerprinting Detection:
To identify server technology fingerprinting:
humble -u https://example.com -f "nginx"
This returns statistics on headers that may reveal the underlying technology stack.
Skip Specific Headers:
To exclude certain headers from missing/insecure checks:
humble -u https://example.com -s "Server X-Powered-By"
5. Understanding the Analysis: What the Results Mean
Humble categorizes findings into four critical areas:
Missing Headers (15 essential checks): Identifies absent security headers such as Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, and Strict-Transport-Security. Each missing header represents a potential attack vector—for instance, missing `X-Frame-Options` enables clickjacking attacks.
Fingerprinting Headers (1,286 checks): Detects headers that inadvertently disclose server information, technology versions, or internal infrastructure details. Headers like Server, X-Powered-By, and `X-AspNet-Version` should be removed or sanitized in production environments.
Deprecated Headers and Insecure Values (158 checks): Flags headers using outdated protocols or insecure configurations. For example, `Public-Key-Pins` (HPKP) is deprecated and should be replaced with Expect-CT.
Content Security Policy Validation (28 checks): Analyzes CSP implementations against W3C CSP Level 3 specifications, identifying weak directives like `unsafe-inline` or missing `report-uri` endpoints.
OWASP Compliance:
The `-c` flag validates compliance with OWASP Secure Headers Project Best Practices:
humble -u https://example.com -c
6. Generating Actionable Guidelines: Fixing What’s Broken
Humble doesn’t just identify problems—it provides solutions. The `-g` flag prints guidelines for enabling security HTTP response headers on popular frameworks, servers, and services:
humble -u https://example.com -g
Example Nginx Configuration (from Humble guidelines):
add_header X-Frame-Options "SAMEORIGIN" always; add_header X-Content-Type-Options "nosniff" always; add_header X-XSS-Protection "1; mode=block" always; add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always; add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline';" always;
Example Apache Configuration:
Header always set X-Frame-Options "SAMEORIGIN" Header always set X-Content-Type-Options "nosniff" Header always set X-XSS-Protection "1; mode=block" Header always set Strict-Transport-Security "max-age=31536000; includeSubDomains"
Example Cloudflare Workers/Pages:
headers.set("X-Frame-Options", "SAMEORIGIN");
headers.set("X-Content-Type-Options", "nosniff");
headers.set("Referrer-Policy", "strict-origin-when-cross-origin");
The `-grd` flag provides specific grading advice for improvement:
humble -u https://example.com -grd
- Automation and Integration: Building Security into the Pipeline
CI/CD Pipeline Integration (GitHub Actions):
- name: Run Humble Security Headers Analysis run: | humble -u https://staging.example.com -cicd > results.json if grep -q '"grade":"F"' results.json; then exit 1; fi
Bulk Analysis with Input Files:
Create a file with HTTP response headers (e.g., from `curl -D headers.txt https://example.com`):
humble -if headers.txt -r
Statistical Analysis Across Multiple URLs:
Create a file with URLs echo "https://example1.com" > urls.txt echo "https://example2.com" >> urls.txt Run and aggregate statistics while read url; do humble -u $url -a >> stats.txt; done < urls.txt
Scheduled Scanning with Cron (Linux):
Daily security header scan at 2 AM 0 2 /usr/bin/humble -u https://production.example.com -o json -op /var/reports/$(date +\%Y\%m\%d)/
What Undercode Say:
- Key Takeaway 1: Humble transforms the complex and often overlooked domain of HTTP security headers into an accessible, automated assessment process. With over 1,500 individual checks, it provides depth that manual reviews cannot achieve, making it suitable for both rapid assessments and comprehensive audits.
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Key Takeaway 2: The tool’s export capabilities and CI/CD integration make it a practical choice for DevSecOps environments. By embedding security header validation into the development pipeline, organizations can catch misconfigurations before they reach production, reducing the attack surface significantly.
Analysis: Humble stands out in the crowded field of security scanners due to its laser focus on a specific, critical attack vector—HTTP headers. While tools like SecurityHeaders.com and Mozilla Observatory offer similar functionality, Humble’s open-source nature, offline capability, and extensive export options make it uniquely valuable for internal assessments and air-gapped environments. Its inclusion in Kali Linux and recognition by OWASP underscore its credibility.
However, organizations should view Humble as one component of a comprehensive security strategy. The tool identifies misconfigurations but does not exploit them or validate business logic vulnerabilities. For maximum effectiveness, integrate Humble with vulnerability scanners, penetration testing, and runtime application self-protection (RASP) solutions.
The growing adoption of Humble in enterprise environments signals a broader shift toward proactive security posture management. As web applications become more complex and attack surfaces expand, tools that automate the detection of foundational security controls will become indispensable. The project’s active maintenance and regular updates—with the latest version as recent as May 2026—ensure continued relevance in an evolving threat landscape.
Prediction:
- +1 Humble’s integration into mainstream CI/CD pipelines will accelerate, with major cloud providers offering it as a managed security service within the next 12-18 months.
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+1 The tool’s fingerprinting capabilities will evolve to include AI-driven anomaly detection, identifying header-based behavioral patterns indicative of zero-day vulnerabilities.
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-1 As web servers and frameworks increasingly implement security headers by default, the “missing headers” category may become less relevant, requiring Humble to shift focus toward header value validation and dynamic policy analysis.
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-1 The proliferation of microservices and edge computing will complicate header analysis, as responses may originate from multiple layers (CDN, API gateway, application server), potentially generating false positives that require manual triage.
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+1 Humble’s recognition by OWASP and inclusion in Kali Linux will drive community contributions, expanding its database of checks and framework-specific guidelines, making it the de facto standard for HTTP header security assessment.
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