ExtensionsDeveloper Tools & QA Engineering

Web Response Tool — HTTP Inspector & Viewport Browser Extension

A lightweight Manifest V3 developer extension for inspecting live HTTP response headers, testing custom API payloads, and validating multi-device responsive breakpoints directly inside Chromium browsers.

Platform

Chrome, Edge & Brave (MV3)

Timeline

8 Weeks

Release

2025-09-24

Last Updated

2026-02-28

Store Compliance Record

Verification & Governance

Package / Bundle / Identifier
com.appqor.webresponsetool
Target SDK & Runtime
Chrome Web Store & Microsoft Edge Add-ons (Manifest V3)
Monetization & Billing Governance
Free Developer Utility with Pro Team Profiles

1. Product Overview

Engineered by AppQor for frontend architects, QA engineers, and technical SEO auditors, Web Response Tool eliminates the need to switch between external proxy clients and browser DevTools. Running on an event-driven Manifest V3 service worker with zero idle RAM footprint, it provides real-time status code chains, redirect hops, security header audits, and responsive viewport emulation in a unified side panel.

2. Engineering Objective

Replace heavy legacy Manifest V2 network debugging extensions with a permission-minimal, zero-telemetry Manifest V3 tool that passes Chrome Web Store security validation with zero warnings.

3. Measurable Outcome

Reduced developer QA debugging cycles by 42%, consumes 0 MB memory when inactive via ephemeral service workers, and maintains full compatibility across Chrome, Edge, and Brave.

System Capabilities

Core Feature Architecture

Live HTTP Status & Redirect Chain Inspector

  • Instant visualization of 200, 301, 302, 307, 308, 404, and 500 status chains
  • Millisecond TTFB (Time to First Byte) and response timing breakdown
  • One-click copy of cURL, Fetch, and raw HTTP response headers

Security & Caching Header Auditor

  • Automated checks for CSP, HSTS, X-Frame-Options, and CORS headers
  • Cache-Control, ETag, and CDN edge hit/miss diagnostic badges
  • Custom header override rules via declarativeNetRequest API

Responsive Viewport & DOM Diagnostics

  • Preset smartphone, tablet, and desktop viewport switcher
  • Shadow DOM isolated overlay that never mutates host page styles
  • Canonical tag, robots meta, and JSON-LD schema quick inspector
Technology Stack

Multi-Layer Engineering Stack

Extension Core
Manifest V3TypeScript 5Service WorkersDeclarativeNetRequest API
UI & Isolation
React 19Shadow DOM EncapsulationChrome SidePanel APITailwind CSS
Storage & Packaging
chrome.storage.localVite BundlerWebExtension Polyfill
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