Website Security Header Auditor with AI Remediation and Sheets Reporting - n8n Workflow

Security Engineers & Consultants: Automating routine vulnerability scanning for large portfolios.
DevOps Teams: Integrating proactive security checks into deployment pipelines.
Web Development Agencies: Ensuring all client sites meet minimum security standards automatically.
n8n Automation Specialists: Users looking for advanced examples of conditional logic, custom coding, and AI integration within a single n8n workflow.

Manually checking security headers (like Content Security Policy, X-Frame-Options, and HSTS) across multiple websites is tedious and prone to error. This complex n8n workflow solves this by providing a hands-off, intelligent auditing system. When triggered via the form, the n8n node sequence automatically fetches headers, applies custom grading logic, and, crucially, utilizes a Large Language Model (LLM) agent via a specialized n8n node to instantly generate specific, actionable remediation code (e.g., Nginx snippets) if a low score is detected. This powerful n8n automation ensures immediate actionability, saving time for engineering teams. All findings are meticulously logged in Google Sheets for tracking and historical analysis, demonstrating the versatility of n8n templates for mission-critical operations.

This high-utility n8n workflow begins execution with the Form Input n8n trigger, which receives the target URL(s).

1. Data Collection: The URL List node prepares the data, which is then passed to the Fetch Headers HTTP Request n8n node to retrieve the raw security headers for the specified website.


2. Scoring Logic: The Parse Headers and Security Scorer custom code n8n node instances work together to extract relevant security headers and assign a numerical score based on best practices. The Grade Calculator then converts this score into a pass/fail condition.


3. Conditional Remediation: The If n8n node determines the next step. If the security grade is poor (True branch), the workflow proceeds to AI intervention.


4. AI Analysis: The AI Remediation Model n8n node configures the LLM connection (OpenRouter/OpenAI). The AI Remediation Agent n8n node analyzes the deficient headers and outputs precise configuration recommendations needed to resolve the issues.


5. Alerting & Reporting (AI Path): Data passes through Data Aggregator, Style Constants, Content Builder, and Email Formatter (all custom code n8n node instances) to create a styled HTML email alert. The final Send Alert Gmail n8n node immediately notifies the security team of the findings and the AI-generated fix.


6. Final Reporting: Regardless of the score, the audit findings are structured by the Format Report n8n node and then permanently logged into a tracking spreadsheet using the Export to Sheets Google Sheets n8n node. This ensures comprehensive logging for every run of the n8n workflow.

To deploy this automated n8n workflow, follow these setup steps:

1. Import: Copy the entire JSON code and import it directly into your n8n instance using the 'New' menu -> 'Import from JSON'. This provides the full framework of this valuable n8n template.


2. Form Trigger Setup: Configure the Form Input n8n trigger. After saving the workflow, activate it to generate the unique webhook URL required for triggering the audit.


3. Google Sheets Credentials: The Export to Sheets n8n node requires a Google Sheets credential setup. Ensure this credential has write access to the target spreadsheet where audit logs will be stored. You must specify the Spreadsheet ID and Sheet Name within this n8n node.


4. AI Model Setup: The AI Remediation Model n8n node (Langchain/OpenRouter) requires API key configuration for your chosen LLM provider (e.g., OpenAI or a compatible service). This connection is crucial for the generative AI step in the n8n workflow.


5. Gmail Credentials: Set up credentials for the Send Alert Gmail n8n node, specifying the sender account and the recipient email address in the node's parameters. This n8n node ensures security personnel are instantly alerted to critical issues.


6. Code Review: Review the logic within the Parse Headers, Security Scorer, and Grade Calculator Code n8n node instances to ensure the scoring criteria align with your organization's specific security policies. This customization ensures the n8n template functions optimally for your needs.

Form Input (n8n trigger): Initiates the n8n workflow upon receiving an HTTP POST request, typically containing the URL to audit.
Fetch Headers (HTTP Request n8n node): Performs the website request using the specified URL and captures all resulting HTTP headers. Key Configuration: Method set to GET, capturing headers.
Parse Headers / Security Scorer / Grade Calculator (Code n8n node): These three custom code n8n node steps are responsible for the core business logic—cleaning the header data, analyzing which security policies are missing or misconfigured, assigning a weighted score, and calculating the final letter grade.
If (n8n node): Implements conditional routing. It checks the calculated score; if the score falls below a defined threshold (e.g., grade C or lower), it proceeds to the AI remediation branch.
AI Remediation Agent (Langchain Agent n8n node): This is the heart of the intelligence. Using the defined LLM model, it receives the audit findings (the list of missing headers) and generates configuration code (e.g., Nginx server blocks) to fix the security deficiencies. This specialized n8n node greatly enhances automation.
Email Formatter / Content Builder (Code n8n node): Prepares a sophisticated HTML body for the alert email, embedding the audit results alongside the AI-generated remediation code. This ensures a professional presentation from the n8n workflow.
Send Alert (Gmail n8n node): Sends the critical security alert email containing the full audit and remediation suggestions to the responsible team.
Export to Sheets (Google Sheets n8n node): Writes the final structured audit data, including the URL, score, and timestamp, into the designated sheet for persistent logging, completing the reporting cycle of the n8n workflow.