Technical Information
| HTTP Status Code | 200 |
| HTTP Version | HTTP/1.1 |
| HTTPS | ✔ Available |
| IP Address | 52.44.244.251 |
| Server Software | duo-api |
| CDN | CDN (Miss from cloudfront) |
| Compression | gzip |
|
ℹ 🔵 Missing HSTS | HTTP Strict Transport Security is not configured. Recommended for HTTPS sites. |
|
ℹ 🔵 Missing Content Security Policy | CSP is not configured. It helps prevent XSS attacks and content injection. |
HTTP Status Code 200
HTTP Version HTTP/1.1
HTTPS ✔ Available
IP Address 52.44.244.251
Server Software duo-api
CDN CDN (Miss from cloudfront)
Compression gzip
ℹ 🔵 Missing HSTS HTTP Strict Transport Security is not configured. Recommended for HTTPS sites.
ℹ 🔵 Missing Content Security Policy CSP is not configured. It helps prevent XSS attacks and content injection.
Redirect Chain
| # | URL | HTTP Status Code | Status |
| 1 | https://support.duolingo.com:443 | 301 | HTTP/2 301 |
| 2 | https://www.duolingo.com/help | 200 | HTTP/2 200 |
#1 URL https://support.duolingo.com:443
HTTP Status Code 301
Status HTTP/2 301
#2 URL https://www.duolingo.com/help
HTTP Status Code 200
Status HTTP/2 200
Performance
| DNS Lookup | 8.5 ms |
| TCP Connect | 9.5 ms |
| TLS Handshake | 3.4 ms |
| Time To First Byte (TTFB) | 276.5 ms |
| Content Download | 0.2 ms |
| Total Response Time | 276.6 ms |
DNS Lookup 8.5 ms
TCP Connect 9.5 ms
TLS Handshake 3.4 ms
Time To First Byte (TTFB) 276.5 ms
Content Download 0.2 ms
Total Response Time 276.6 ms
Security
| HTTPS | ✔ Enabled |
| HSTS | ✘ Not configured |
| CSP | ⚠ Not configured |
| X-Frame-Options | ✔ SAMEORIGIN |
| X-Content-Type-Options | ⚠ Not configured |
| HTTP/2 | ⚠ HTTP/1.1 |
HTTPS ✔ Enabled
HSTS ✘ Not configured
CSP ⚠ Not configured
X-Frame-Options ✔ SAMEORIGIN
X-Content-Type-Options ⚠ Not configured
HTTP/2 ⚠ HTTP/1.1
SEO Quick Check
Detected Technologies
| Technology | Google Tag Manager |
Technology Google Tag Manager
HTTP Headers
| Content-type
| text/html; charset=UTF-8 |
| Date
| Sat, 29 Aug 2026 23:16:42 GMT |
| X-envoy-upstream-service-time
| 10 |
| X-duo-request-host
| www.duolingo.com |
| Server
| duo-api |
| Set-cookie
| wuuid=1104c4aa-8806-4664-8eb6-02913a9ce1d1 |
| No-retry
| 1 |
| Cache-control
| no-store, no-cache, must-revalidate, proxy-revalidate |
| Expires
| 0 |
| Pragma
| no-cache |
| Surrogate-control
| no-store |
| X-frame-options
| SAMEORIGIN |
| X-tid
| fffff16b6a932b7056c7 |
| X-ws
| UK |
| X-runtime
| 0.00807 |
| Content-encoding
| gzip |
| X-cache
| Miss from cloudfront |
| Via
| 1.1 a965878804ac1c1f3c0d550178a03126.cloudfront.net (CloudFront) |
| X-amz-cf-pop
| CDG54-P1 |
| X-amz-cf-id
| 8xOUD0AjG653GVqbq7N2kC4MmXSgzSTBirMqqVUc5_aCwP-IzvOUsQ== |
Meta Tags
| Viewport | width=device-width,initial-scale=1,user-scalable=no |
| Robots | NOODP |
| Refresh | 0; url=/nojs/splash |
| Apple-mobile-web-app-capable | yes |
| Apple-mobile-web-app-status-bar-style | black |
| Apple-mobile-web-app-title | Duolingo |
| Google | notranslate |
| Mobile-web-app-capable | yes |
| Apple-itunes-app | app-id=570060128 |
| Facebook-domain-verification | mwudgypvvgl4fekxjk5rpk3eqg7ykt |
| Fb:app_id | 234536436609303 |
| Keywords | learn, spanish, german, french, portuguese, italian, english, free, lessons, course, language, study, flashcards |
| Description | Duolingo is the world |
Content-type text/html; charset=UTF-8
Date Sat, 29 Aug 2026 23:16:42 GMT
X-envoy-upstream-service-time 10
X-duo-request-host www.duolingo.com
Server duo-api
Set-cookie wuuid=1104c4aa-8806-4664-8eb6-02913a9ce1d1
No-retry 1
Cache-control no-store, no-cache, must-revalidate, proxy-revalidate
Expires 0
Pragma no-cache
Surrogate-control no-store
X-frame-options SAMEORIGIN
X-tid fffff16b6a932b7056c7
X-ws UK
X-runtime 0.00807
Content-encoding gzip
X-cache Miss from cloudfront
Via 1.1 a965878804ac1c1f3c0d550178a03126.cloudfront.net (CloudFront)
X-amz-cf-pop CDG54-P1
X-amz-cf-id 8xOUD0AjG653GVqbq7N2kC4MmXSgzSTBirMqqVUc5_aCwP-IzvOUsQ==
