HTTP Header Spy icon

HTTP Header Spy

by Michiel Roos · michielroos.com · Developer Tools
Established publisherManifest V3 Free
View in Chrome Web Store Data as of 15 Oct 2026

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

Users
9,000
+1,000 in 30 days
Rating
3.8 / 5
unchanged in 30 days
Ratings
61
0 in 30 days
Store rank
#10K
#8,890 among extensions
Version
3.0.0
updated 5 Sep 2026

Users

monthly, 3 years
2,0006,00010KAug 2023Apr 2025Oct 2026
Latest, 15 Oct 2026: 9,000 usersMove the mouse over the chart for any month

Ratings count

monthly, 3 years
204162Aug 2023Apr 2025Oct 2026
Latest, 15 Oct 2026: 61 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About HTTP Header Spy

Inspect HTTP headers and response times without opening the page inspector tool. View headers right in the page you are looking at. ★ Auto-hide information panels after specified time ★ Response times ★ Server IP ★ XHR and sub-frame requests ★ Headers also available in the browser action popup ★ Follow the full redirect path ★ Show HSTS requests ★ Colorful status indication icons ★ Inspect Form Data, Get parameters and Cookies ★ Micro mode shows just the chosen response headers ★ Position in one of the four corners of the window ★ Easy single-click highlighting of the headers ★ Choose between a light and a dark color-scheme ★ Filter headers to be shown ★ Highlight any string pattern in the header views

Growth

WindowUsersChangeRatingsRating
7 days0+0.0%00.00
30 days+1,000+12.5%00.00
6 months+1,000+12.5%00.00
1 year−1,000−10.0%−1+0.05

Chrome Web Store search rankings

Where HTTP Header Spy appears when people search the store, with the 30 day change
Search phrasePosition30 days
header#73new

Version history

2 versions recorded
3.0.05 Sep 2026
2.0.4926 Sep 2018

Details

Category
Developer Tools
First seen
26 Sep 2018
Size
293 KB
Languages
en, nl, es, ru, hi, zh-CN
Pricing
Free
Extension ID
agnoocojkneiphkobpcfoaenhpjnmifb

Permissions and risk

Moderate riskimpact 3, likelihood 2
Permissions
tabsactiveTabstoragewebRequestscripting
Site access
http://*/*https://*/*
Can read and change data on every website you visit.

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