Información Técnica
| Código de estado HTTP | 200 |
| Versión HTTP | HTTP/1.1 |
| HTTPS | ✔ Disponible |
| Dirección IP | 18.164.52.68 |
| Software del servidor | AmazonS3 |
| CDN | CDN (Hit from cloudfront) |
| 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 18.164.52.68
Software del servidor AmazonS3
CDN CDN (Hit from cloudfront)
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).
Cadena de Redirecciones
| # | URL | Código de estado HTTP | Estado |
| 1 | https://cnx.org:443 | 301 | HTTP/2 301 |
| 2 | https://openstax.org | 200 | HTTP/2 200 |
#1 URL https://cnx.org:443
Código de estado HTTP 301
Estado HTTP/2 301
#2 URL https://openstax.org
Código de estado HTTP 200
Estado HTTP/2 200
Rendimiento
| Resolución DNS | 28.1 ms |
| Conexión TCP | 29.2 ms |
| Negociación TLS | 6 ms |
| Tiempo hasta el primer byte (TTFB) | 38.6 ms |
| Descarga de contenido | 0.1 ms |
| Tiempo total de respuesta | 38.7 ms |
Resolución DNS 28.1 ms
Conexión TCP 29.2 ms
Negociación TLS 6 ms
Tiempo hasta el primer byte (TTFB) 38.6 ms
Descarga de contenido 0.1 ms
Tiempo total de respuesta 38.7 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 | OpenStax |
| Meta descripción | OpenStax offers free college textbooks for all types of students, making education accessible & affordable for everyone. Browse our list of available subjects! |
| Título Open Graph | OpenStax | Free Textbooks Online with No Catch |
| Descripción Open Graph | OpenStax offers free college textbooks for all types of students, making education accessible & affordable for everyone. Browse our list of available subjects! |
| Imagen Open Graph | https://images.openstax.org/apps/image-cdn/v1/assets.open... |
| Twitter Card | summary_large_image |
| Título Twitter | OpenStax | Free Textbooks Online with No Catch |
| Descripción Twitter | OpenStax offers free college textbooks for all types of students, making education accessible & affordable for everyone. Browse our list of available subjects! |
| Imagen Twitter | https://images.openstax.org/apps/image-cdn/v1/assets.open... |
Título OpenStax Meta descripción OpenStax offers free college textbooks for all types of students, making education accessible & affordable for everyone. Browse our list of available subjects! Título Open Graph OpenStax | Free Textbooks Online with No Catch Descripción Open Graph OpenStax offers free college textbooks for all types of students, making education accessible & affordable for everyone. Browse our list of available subjects! Imagen Open Graph https://images.openstax.org/apps/image-cdn/v1/assets.open... Twitter Card summary_large_image Título Twitter OpenStax | Free Textbooks Online with No Catch Descripción Twitter OpenStax offers free college textbooks for all types of students, making education accessible & affordable for everyone. Browse our list of available subjects! Imagen Twitter https://images.openstax.org/apps/image-cdn/v1/assets.open... Cabeceras HTTP
| Content-type
| text/html |
| Last-modified
| Tue, 28 Jul 2026 16:54:37 GMT |
| X-amz-version-id
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| Server
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| Date
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| Cache-control
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| Etag
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| Via
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| X-amz-cf-pop
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| Age
| 2 |
Meta Tags
| Viewport | width=device-width,initial-scale=1,maximum-scale=5 |
| Description | OpenStax offers free college textbooks for all types of students, making education accessible & affordable for everyone. Browse our list of available subjects! |
| Mobile-web-app-capable | yes |
| Theme-color | #fff |
| Application-name | @openstax/os-webview |
| Apple-mobile-web-app-capable | yes |
| Apple-mobile-web-app-status-bar-style | black-translucent |
| Apple-mobile-web-app-title | @openstax/os-webview |
| Msapplication-TileColor | #fff |
| Msapplication-TileImage |  |
| Msapplication-config | /dist/assets/browserconfig.xml |
Content-type text/html
Last-modified Tue, 28 Jul 2026 16:54:37 GMT
X-amz-version-id .PvQZ8Jte5WIAAFnRUWmQ3i4TKFP7X8d
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