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LeoWSY-hashblue
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techstack-backend

Identify backend tech stacks from HTTP headers, cookies, and error pages.

3|1|Updated May 26, 2026
Search Tags:#backend#web-security#osint#fingerprinting#http-headers#techstack
One-click install
npx skills add https://github.com/LeoWSY-hashblue/-communitytools-custom --skill techstack-backend
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: techstack-backend
Source: https://github.com/LeoWSY-hashblue/-communitytools-custom/tree/main/skills/techstack-identification/backend
Command: npx skills add https://github.com/LeoWSY-hashblue/-communitytools-custom --skill techstack-backend

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Identify server-side technologies used by web applications by analyzing HTTP headers, cookies, error pages, and API endpoints.

Core Features & Use Cases

  • Fingerprint backend tech via Server and X-Powered-By headers
  • Infer runtimes, frameworks, CMS, and databases from indicators and error pages
  • Use cases: mapping tech stacks for security assessments and vendor diligence

Quick Start

Provide a target URL to begin passive fingerprinting of its backend tech stack.

Frequently Asked Questions about techstack-backend

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I identify a website's backend tech stack from HTTP headers?▼

You can identify a backend tech stack by analyzing HTTP signals like Server headers, X-Powered-By, cookies, and error pages. This process maps server-side technologies to infer the underlying runtimes, frameworks, and CMS used by the target web application.

What HTTP signals are used to fingerprint server-side frameworks and CMS platforms?▼

Fingerprinting server-side frameworks and CMS platforms relies on HTTP signals such as Server headers, X-Powered-By, specific cookies, error page formats, and CMS API paths. These indicators help infer the exact runtimes, databases, and frameworks deployed.

Can I use HTTP fingerprinting for OSINT and security vulnerability reconnaissance?▼

Yes, HTTP fingerprinting is applicable for OSINT and vulnerability-recon workflows. By mapping servers, runtimes, frameworks, CMS, databases, and API styles across diverse web deployments, it effectively supports security assessments and vendor diligence.

How do I detect backend APIs and databases using passive web fingerprinting?▼

Passive web fingerprinting detects backend APIs and databases by analyzing HTTP headers and CMS paths without active probing. It maps technology stacks and API styles by relying on indicators like Server headers, cookies, and error pages.

What is the best way to map web server technologies during vendor diligence?▼

The best way to map web server technologies during vendor diligence is passive fingerprinting. By analyzing HTTP signals like Server and X-Powered-By headers, you can infer the complete backend technology stack and API styles across diverse deployments.

Are there limitations to inferring backend runtimes solely from HTTP headers and error pages?▼

Inferring backend runtimes solely from HTTP headers and error pages can be limited by masked or spoofed HTTP signals. If Server headers, X-Powered-By, and cookies are stripped or altered, the fingerprinting accuracy for identifying frameworks and databases decreases.

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