Technical Information
| HTTP Status Code | 200 |
| HTTP Version | HTTP/1.1 |
| HTTPS | ✔ Available |
| IP Address | 76.76.21.21 |
| Server Software | Vercel |
| CDN | Vercel |
| Compression | gzip |
|
ℹ 🔵 Missing Content Security Policy | CSP is not configured. It helps prevent XSS attacks and content injection. |
|
ℹ 🔵 Missing X-Frame-Options | The site can be embedded in iframes by third parties (clickjacking risk). |
HTTP Status Code 200
HTTP Version HTTP/1.1
HTTPS ✔ Available
IP Address 76.76.21.21
Server Software Vercel
CDN Vercel
Compression gzip
ℹ 🔵 Missing Content Security Policy CSP is not configured. It helps prevent XSS attacks and content injection.
ℹ 🔵 Missing X-Frame-Options The site can be embedded in iframes by third parties (clickjacking risk).
Redirect Chain
| # | URL | HTTP Status Code | Status |
| 1 | https://reactjs.org:443 | 308 | HTTP/2 308 |
| 2 | https://react.dev/ | 200 | HTTP/2 200 |
#1 URL https://reactjs.org:443
HTTP Status Code 308
Status HTTP/2 308
#2 URL https://react.dev/
HTTP Status Code 200
Status HTTP/2 200
Performance
| DNS Lookup | 30 ms |
| TCP Connect | 30.8 ms |
| TLS Handshake | 6.2 ms |
| Time To First Byte (TTFB) | 52 ms |
| Content Download | 1.8 ms |
| Total Response Time | 53.8 ms |
DNS Lookup 30 ms
TCP Connect 30.8 ms
TLS Handshake 6.2 ms
Time To First Byte (TTFB) 52 ms
Content Download 1.8 ms
Total Response Time 53.8 ms
Security
| HTTPS | ✔ Enabled |
| HSTS | ✔ max-age=63072000 |
| CSP | ⚠ Not configured |
| X-Frame-Options | ⚠ Not configured |
| X-Content-Type-Options | ⚠ Not configured |
| HTTP/2 | ⚠ HTTP/1.1 |
HTTPS ✔ Enabled
HSTS ✔ max-age=63072000
CSP ⚠ Not configured
X-Frame-Options ⚠ Not configured
X-Content-Type-Options ⚠ Not configured
HTTP/2 ⚠ HTTP/1.1
SEO Quick Check
| Meta Description | React is the library for web and native user interfaces. Build user interfaces out of individual pieces called components written in JavaScript. React is designed to let you seamlessly combine components written by independent people, teams, and organizations. |
| Canonical | https://react.dev/ |
| Open Graph Title | React |
| Open Graph Description | React is the library for web and native user interfaces. Build user interfaces out of individual pieces called components written in JavaScript. React is designed to let you seamlessly combine components written by independent people, teams, and organizations. |
| Open Graph Image | https://react.dev/images/og-home.png |
| Twitter Card | summary_large_image |
| Twitter Title | React |
| Twitter Description | React is the library for web and native user interfaces. Build user interfaces out of individual pieces called components written in JavaScript. React is designed to let you seamlessly combine components written by independent people, teams, and organizations. |
| Twitter Image | https://react.dev/images/og-home.png |
Meta Description React is the library for web and native user interfaces. Build user interfaces out of individual pieces called components written in JavaScript. React is designed to let you seamlessly combine components written by independent people, teams, and organizations. Canonical https://react.dev/ Open Graph Title React Open Graph Description React is the library for web and native user interfaces. Build user interfaces out of individual pieces called components written in JavaScript. React is designed to let you seamlessly combine components written by independent people, teams, and organizations. Open Graph Image https://react.dev/images/og-home.png Twitter Card summary_large_image Twitter Title React Twitter Description React is the library for web and native user interfaces. Build user interfaces out of individual pieces called components written in JavaScript. React is designed to let you seamlessly combine components written by independent people, teams, and organizations. Twitter Image https://react.dev/images/og-home.png Detected Technologies
| Technology | React Google Analytics Google Tag Manager Next.js |
Technology React Google Analytics Google Tag Manager Next.js
HTTP Headers
| Access-control-allow-origin
| * |
| Age
| 149368 |
| Cache-control
| public, max-age=0, must-revalidate |
| Content-disposition
| inline |
| Content-encoding
| gzip |
| Content-type
| text/html; charset=utf-8 |
| Date
| Wed, 22 Jul 2026 07:05:03 GMT |
| Etag
| W/"15d0f47183d149f8354921f58947d274" |
| Server
| Vercel |
| Strict-transport-security
| max-age=63072000 |
| Vary
| RSC, Next-Router-State-Tree, Next-Router-Prefetch, Next-Router-Segment-Prefetch |
| X-matched-path
| / |
| X-vercel-cache
| HIT |
| X-vercel-id
| cdg1::wbq5q-1784703903306-e063c4135021 |
Meta Tags
| Viewport | width=device-width, initial-scale=1 |
| Description | React is the library for web and native user interfaces. Build user interfaces out of individual pieces called components written in JavaScript. React is designed to let you seamlessly combine components written by independent people, teams, and organizations. |
| Fb:app_id | 623268441017527 |
| Google-site-verification | sIlAGs48RulR4DdP95YSWNKZIEtCqQmRjzn-Zq-CcD0 |
| Msapplication-TileColor | #2b5797 |
| Theme-color | #23272f |
Access-control-allow-origin *
Age 149368
Cache-control public, max-age=0, must-revalidate
Content-disposition inline
Content-encoding gzip
Content-type text/html; charset=utf-8
Date Wed, 22 Jul 2026 07:05:03 GMT
Etag W/"15d0f47183d149f8354921f58947d274"
Server Vercel
Strict-transport-security max-age=63072000
Vary RSC, Next-Router-State-Tree, Next-Router-Prefetch, Next-Router-Segment-Prefetch
X-matched-path /
X-vercel-cache HIT
X-vercel-id cdg1::wbq5q-1784703903306-e063c4135021
