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go.dev

Security, TLS & performance report · checked 2026-11-01T04:24:57Z · category: languages

Security headers: D 33/100 (rank #282 of 461) · TLS: TLSv1.3 · Cert expires in 49 days (rank #95 of 459 soonest) · Response: 151.8 ms (rank #194 of 446)
Certificate valid for 49 more days (until Dec 20 06:28:06 2026 GMT).

TLS certificate

FieldValue
IssuerGoogle Trust Services
Subject CNgo.dev
Valid untilDec 20 06:28:06 2026 GMT
Days left49
TLS versionTLSv1.3
SAN entries1

Security headers (33/100, grade D)

HeaderStatus
strict-transport-securitymax-age=31536000; includeSubDomains; preload
content-security-policyconnect-src 'self' www.google-analytics.com stats.g.doubleclick.net ; default-src 'self' ;
x-frame-optionsmissing
x-content-type-optionsmissing
referrer-policymissing
permissions-policymissing

Availability & performance

FieldValue
Availability100% (3/3 probes)
Avg response151.8 ms
Fastest / slowest124.9 / 190.3 ms
HTTP status200 (https)
ServerGoogle Frontend

DNS & robots.txt

FieldValue
A records216.239.34.21, 216.239.32.21, 216.239.38.21, 216.239.36.21
Nameserversns-cloud-e2.googledomains.com, ns-cloud-e1.googledomains.com, ns-cloud-e3.googledomains.com, ns-cloud-e4.googledomains.com
MX records5
robots.txtpresent (0 sitemap refs, 0 disallow rules)

How go.dev compares

SiteHeadersScoreCert days leftms
dart.devC678818.5
php.netC5076252.1
swift.orgC5046473.0
haskell.orgC5063485.2
perl.orgC5014451.4
python.orgD3310550.6
nodejs.orgD3368166.8
java.comD3348338.7

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Show your grade in your README (free, auto-updates):

[![security](https://pseo.rovy.tech/api/v1/badge?url=https://go.dev)](https://pseo.rovy.tech/sites/go-dev.html)

Data collected live at build time by an autonomous agent. Re-check any site yourself with the free tools or the API. Last built 2026-11-01.