# HTTP Header Spy

> HTTP Header Spy enables you to inspect request- response headers and cookies right after page load with no extra clicks.

Canonical page: [https://chrome-stats.com/d/http-header-spy](https://chrome-stats.com/d/http-header-spy)

## Overview

- **ID:** `http-header-spy`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Michiel Roos
- **Category:** web-development
- **Daily users:** 234
- **Weekly downloads:** 10
- **Rating:** 4.80 / 5 (5 ratings)
- **Version:** 2.0.49
- **Last updated:** 2020-01-09
- **First published:** 2020-01-09
- **Size:** 594 KB
- **Data as of:** 2026-09-07
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/http-header-spy/)
- **Website:** [https://github.com/Tuurlijk/HTTP-Header-Spy](https://github.com/Tuurlijk/HTTP-Header-Spy)

## Description

HTTP Header Spy is a powerful Chrome extension that empowers web developers and analysts to instantly inspect HTTP request and response headers alongside cookies right after the page loads, eliminating the need to open any developer tools.

With features like automatic hiding of information panels, detailed response time metrics, server IP display, full redirect path tracking, and support for XHR and sub-frame requests, this tool streamlines header inspection. Users can also select from light or dark themes, filter and highlight headers, and position the viewing panel in any corner of the browser window. HTTP Header Spy makes it easy to analyze form data, GET parameters, cookies, and security features such as HSTS with colorful visual status indicators, enhancing productivity and ease of debugging.

## Rankings

- #7,597 — Overall
- #5 — ad spy
- #14 — header
- #69 — response
- #169 — lead
- #184 — request

## Permissions and access

### Permissions

- `http://*/*`
- `https://*/*`
- `tabs`
- `activeTab`
- `storage`
- `webRequest`

### Content script matches

- `*`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Low risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Similar extensions and apps

- [Header Spy](https://chrome-stats.com/d/header-spy) — 26 users
- [HTTP Headers Spy](https://chrome-stats.com/d/http-headers-spy) — 32 users
- [Headers Spy](https://chrome-stats.com/d/headers-spy) — 6 users
- [HTTP Server header Spy](https://chrome-stats.com/d/http-server-header-spy) — 14 users
- [HTTP Header Analyzer Pro](https://chrome-stats.com/d/http-header-analyzer-pro) — 6 users
- [Request Spy](https://chrome-stats.com/d/request_spy) — 28 users
- [HTTP Headers Viewer](https://chrome-stats.com/d/http-headers-viewer-iue) — 12 users
- [HTTP Headers Viewer](https://chrome-stats.com/d/http-headers-viewer) — 32 users
- [HeaderScoper](https://chrome-stats.com/d/headerscoper) — 28 users
- [AP HTTP headers](https://chrome-stats.com/d/ap-http-headers)
- [HTTP Header Analyzer Pro](https://chrome-stats.com/d/http-analyzer-pro) — 6 users
- [HTTP Header Network Monitoring](https://chrome-stats.com/d/http-header-network-monitoring) — 6 users

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Source: [Chrome-Stats](https://chrome-stats.com/d/http-header-spy)