Resultado de la comprobación para: openstax.org
Información adicional para https://openstax.org
Información Técnica
| Código de estado HTTP | 200 |
| Versión HTTP | HTTP/1.1 |
| HTTPS | ✔ Disponible |
| Dirección IP | 13.227.231.54 |
| Software del servidor | AmazonS3 |
| CDN | CDN (RefreshHit 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 13.227.231.54
Software del servidor AmazonS3
CDN CDN (RefreshHit 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).
Rendimiento
| Resolución DNS | 1.8 ms |
| Conexión TCP | 3 ms |
| Negociación TLS | 6 ms |
| Tiempo hasta el primer byte (TTFB) | 185.8 ms |
| Descarga de contenido | 0.1 ms |
| Tiempo total de respuesta | 185.9 ms |
Resolución DNS 1.8 ms
Conexión TCP 3 ms
Negociación TLS 6 ms
Tiempo hasta el primer byte (TTFB) 185.8 ms
Descarga de contenido 0.1 ms
Tiempo total de respuesta 185.9 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
| Wed, 15 Jul 2026 15:06:07 GMT |
| X-amz-version-id
| TcxsPiIaJ0.UTQiiQr3Ps0DCLo_PSe1Q |
| Content-encoding
| gzip |
| Server
| AmazonS3 |
| Date
| Wed, 22 Jul 2026 21:10:17 GMT |
| Cache-control
| public,max-age=60 |
| Etag
| W/"322165f5c8613aa06c68e5dbf398d100" |
| Vary
| Accept-Encoding |
| X-cache
| RefreshHit from cloudfront |
| Via
| 1.1 cd3b42b97898ebdad92bdcee83d9a284.cloudfront.net (CloudFront) |
| X-amz-cf-pop
| CDG50-P5 |
| X-amz-cf-id
| qu6l2oiulXD-VUL7hyAqhJ9WBj7MVF7xpItFc-3OBx0rxPvNQY_RWQ== |
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 Wed, 15 Jul 2026 15:06:07 GMT
X-amz-version-id TcxsPiIaJ0.UTQiiQr3Ps0DCLo_PSe1Q
Content-encoding gzip
Server AmazonS3
Date Wed, 22 Jul 2026 21:10:17 GMT
Cache-control public,max-age=60
Etag W/"322165f5c8613aa06c68e5dbf398d100"
Vary Accept-Encoding
X-cache RefreshHit from cloudfront
Via 1.1 cd3b42b97898ebdad92bdcee83d9a284.cloudfront.net (CloudFront)
X-amz-cf-pop CDG50-P5
X-amz-cf-id qu6l2oiulXD-VUL7hyAqhJ9WBj7MVF7xpItFc-3OBx0rxPvNQY_RWQ==
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! Og:url https://openstax.org/ Og:type article Og:title OpenStax | Free Textbooks Online with No Catch Og:description OpenStax offers free college textbooks for all types of students, making education accessible & affordable for everyone. Browse our list of available subjects! Og:image https://images.openstax.org/apps/image-cdn/v1/assets.openstax.org/f=webp,w=640,h=480/oscms-prodcms/media/images/240919_OpenStax_Students_Martin_272.original.webp Og:image:alt OpenStax: OpenStax | Free Textbooks Online with No Catch Twitter:card summary_large_image Twitter:site @OpenStax Twitter:title OpenStax | Free Textbooks Online with No Catch Twitter:description OpenStax offers free college textbooks for all types of students, making education accessible & affordable for everyone. Browse our list of available subjects! Twitter:image https://images.openstax.org/apps/image-cdn/v1/assets.openstax.org/f=webp,w=640,h=480/oscms-prodcms/media/images/240919_OpenStax_Students_Martin_272.original.webp Twitter:image:alt OpenStax 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
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