Información Técnica
| Código de estado HTTP | 200 |
| Versión HTTP | HTTP/1.1 |
| HTTPS | ✔ Disponible |
| Dirección IP | 188.114.97.2 |
| Software del servidor | cloudflare |
| CDN | Cloudflare |
| Compresión | gzip |
|
ℹ 🔵 Falta HSTS | No se ha configurado HTTP Strict Transport Security. Recomendado para sitios HTTPS. |
|
ℹ 🔵 Falta Content Security Policy | No se ha configurado CSP. Ayuda a prevenir ataques XSS e inyección de contenido. |
|
ℹ 🔵 Falta X-Frame-Options | El sitio puede ser incrustado en iframes por terceros (riesgo de clickjacking). |
Código de estado HTTP 200
Versión HTTP HTTP/1.1
HTTPS ✔ Disponible
Dirección IP 188.114.97.2
Software del servidor cloudflare
CDN Cloudflare
Compresión gzip
ℹ 🔵 Falta HSTS No se ha configurado HTTP Strict Transport Security. Recomendado para sitios HTTPS.
ℹ 🔵 Falta Content Security Policy No se ha configurado CSP. Ayuda a prevenir ataques XSS e inyección de contenido.
ℹ 🔵 Falta X-Frame-Options El sitio puede ser incrustado en iframes por terceros (riesgo de clickjacking).
Rendimiento
| Resolución DNS | 22.8 ms |
| Conexión TCP | 24.7 ms |
| Negociación TLS | 8.3 ms |
| Tiempo hasta el primer byte (TTFB) | 400.8 ms |
| Descarga de contenido | 58.5 ms |
| Tiempo total de respuesta | 459.4 ms |
Resolución DNS 22.8 ms
Conexión TCP 24.7 ms
Negociación TLS 8.3 ms
Tiempo hasta el primer byte (TTFB) 400.8 ms
Descarga de contenido 58.5 ms
Tiempo total de respuesta 459.4 ms
Seguridad
| HTTPS | ✔ Activado |
| HSTS | ✘ No configurado |
| CSP | ⚠ No configurado |
| X-Frame-Options | ⚠ No configurado |
| X-Content-Type-Options | ⚠ No configurado |
| HTTP/2 | ⚠ HTTP/1.1 |
HTTPS ✔ Activado
HSTS ✘ No configurado
CSP ⚠ No configurado
X-Frame-Options ⚠ No configurado
X-Content-Type-Options ⚠ No configurado
HTTP/2 ⚠ HTTP/1.1
Comprobación SEO
| Título | hypertextbook |
| Meta descripción | Free books to read and enjoy online. General interest hypertext-books and technical hyper-textbooks — physics, mathematics, cycling, education, media, skepticism, West Africa, and more. |
| Canonical | https://hypertextbook.com |
| Título Open Graph | hypertextbook |
| Descripción Open Graph | Free books to read and enjoy online. General interest hypertext-books and technical hyper-textbooks — physics, mathematics, cycling, education, media, skepticism, West Africa, and more. |
| Imagen Open Graph | https://hypertextbook.com/hypertextbook/og-image.jpg |
| Twitter Card | summary |
| Título Twitter | hypertextbook |
| Descripción Twitter | Free books to read and enjoy online. General interest hypertext-books and technical hyper-textbooks — physics, mathematics, cycling, education, media, skepticism, West Africa, and more. |
| Imagen Twitter | https://hypertextbook.com/hypertextbook/og-image.jpg |
Título hypertextbook Meta descripción Free books to read and enjoy online. General interest hypertext-books and technical hyper-textbooks — physics, mathematics, cycling, education, media, skepticism, West Africa, and more. Canonical https://hypertextbook.com Título Open Graph hypertextbook Descripción Open Graph Free books to read and enjoy online. General interest hypertext-books and technical hyper-textbooks — physics, mathematics, cycling, education, media, skepticism, West Africa, and more. Imagen Open Graph https://hypertextbook.com/hypertextbook/og-image.jpg Twitter Card summary Título Twitter hypertextbook Descripción Twitter Free books to read and enjoy online. General interest hypertext-books and technical hyper-textbooks — physics, mathematics, cycling, education, media, skepticism, West Africa, and more. Imagen Twitter https://hypertextbook.com/hypertextbook/og-image.jpg Tecnologías Detectadas
| Tecnología | jQuery Google Analytics Google Tag Manager Cloudflare |
Tecnología jQuery Google Analytics Google Tag Manager Cloudflare
Cabeceras HTTP
| Date
| Fri, 21 Aug 2026 16:04:52 GMT |
| Content-type
| text/html |
| Report-to
| {"group":"cf-nel","max_age":604800,"endpoints":[{"url":"https://a.nel.cloudflare.com/report/v4?s=X%2BqwpMKhRWcIFKQCNEg9PmwNRUi4dHGi0v5Gvy57Tf3SSVpcq5VepUxemaMQOkLz1XpOwgCb9eqqdVZncrpKx%2FLAPpGXS2qzhiRSJ1dJwIh9ksh%2BayoeiYno4Pk%2B5KhI6t%2BU0Sh0E0Y4P%2FALtBx%2FfQ%3D%3D"}]} |
| Vary
| Accept-Encoding |
| Server
| cloudflare |
| Alt-svc
| h3=":443"; ma=86400 |
| X-turbo-charged-by
| LiteSpeed |
| Cf-cache-status
| DYNAMIC |
| Nel
| {"report_to":"cf-nel","success_fraction":0.0,"max_age":604800} |
| Server-timing
| cfEdge;dur=12,cfOrigin;dur=350 |
| Content-encoding
| gzip |
| Cf-ray
| a2eae03f3ab2d08b-CDG |
Meta Tags
| Viewport | width=416 |
| Author | Glenn Elert |
| Apple-mobile-web-app-title | hypertextbook |
| Application-name | hypertextbook |
| Msapplication-config | https://hypertextbook.com/hypertextbook/browserconfig.xml |
| Msapplication-TileColor | #001f3d |
| Theme-color | #ffffff |
| Description | Free books to read and enjoy online. General interest hypertext-books and technical hyper-textbooks — physics, mathematics, cycling, education, media, skepticism, West Africa, and more. |
Date Fri, 21 Aug 2026 16:04:52 GMT
Content-type text/html
Report-to {"group":"cf-nel","max_age":604800,"endpoints":[{"url":"https://a.nel.cloudflare.com/report/v4?s=X%2BqwpMKhRWcIFKQCNEg9PmwNRUi4dHGi0v5Gvy57Tf3SSVpcq5VepUxemaMQOkLz1XpOwgCb9eqqdVZncrpKx%2FLAPpGXS2qzhiRSJ1dJwIh9ksh%2BayoeiYno4Pk%2B5KhI6t%2BU0Sh0E0Y4P%2FALtBx%2FfQ%3D%3D"}]}
Vary Accept-Encoding
Server cloudflare
Alt-svc h3=":443"; ma=86400
X-turbo-charged-by LiteSpeed
Cf-cache-status DYNAMIC
Nel {"report_to":"cf-nel","success_fraction":0.0,"max_age":604800}
Server-timing cfEdge;dur=12,cfOrigin;dur=350
Content-encoding gzip
Cf-ray a2eae03f3ab2d08b-CDG
