Checking results for: openstax.org
Additional info for https://openstax.org
Technical Information
| HTTP Status Code | 200 |
| HTTP Version | HTTP/1.1 |
| HTTPS | ✔ Available |
| IP Address | 13.227.231.22 |
| Server Software | AmazonS3 |
| CDN | CDN (RefreshHit 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. |
|
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 13.227.231.22
Server Software AmazonS3
CDN CDN (RefreshHit 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.
ℹ 🔵 Missing X-Frame-Options The site can be embedded in iframes by third parties (clickjacking risk).
Performance
| DNS Lookup | 1.9 ms |
| TCP Connect | 3 ms |
| TLS Handshake | 3.8 ms |
| Time To First Byte (TTFB) | 209.5 ms |
| Content Download | 0.1 ms |
| Total Response Time | 209.6 ms |
DNS Lookup 1.9 ms
TCP Connect 3 ms
TLS Handshake 3.8 ms
Time To First Byte (TTFB) 209.5 ms
Content Download 0.1 ms
Total Response Time 209.6 ms
Security
| HTTPS | ✔ Enabled |
| HSTS | ✘ Not configured |
| CSP | ⚠ Not configured |
| X-Frame-Options | ⚠ Not configured |
| X-Content-Type-Options | ⚠ Not configured |
| HTTP/2 | ⚠ HTTP/1.1 |
HTTPS ✔ Enabled
HSTS ✘ Not configured
CSP ⚠ Not configured
X-Frame-Options ⚠ Not configured
X-Content-Type-Options ⚠ Not configured
HTTP/2 ⚠ HTTP/1.1
SEO Quick Check
| Title | OpenStax |
| Meta Description | OpenStax offers free college textbooks for all types of students, making education accessible & affordable for everyone. Browse our list of available subjects! |
| Open Graph Title | OpenStax | Free Textbooks Online with No Catch |
| Open Graph Description | OpenStax offers free college textbooks for all types of students, making education accessible & affordable for everyone. Browse our list of available subjects! |
| Open Graph Image | https://images.openstax.org/apps/image-cdn/v1/assets.open... |
| Twitter Card | summary_large_image |
| 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.open... |
Title OpenStax Meta Description OpenStax offers free college textbooks for all types of students, making education accessible & affordable for everyone. Browse our list of available subjects! Open Graph Title OpenStax | Free Textbooks Online with No Catch Open Graph Description OpenStax offers free college textbooks for all types of students, making education accessible & affordable for everyone. Browse our list of available subjects! Open Graph Image https://images.openstax.org/apps/image-cdn/v1/assets.open... Twitter Card summary_large_image 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.open... HTTP Headers
| 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
| Fri, 24 Jul 2026 01:52:19 GMT |
| Cache-control
| public,max-age=60 |
| Etag
| W/"322165f5c8613aa06c68e5dbf398d100" |
| Vary
| Accept-Encoding |
| X-cache
| RefreshHit from cloudfront |
| Via
| 1.1 b823c70c226787b916972c4f07ae29f6.cloudfront.net (CloudFront) |
| X-amz-cf-pop
| CDG50-P5 |
| X-amz-cf-id
| 8-IknC9Kpo-PbvirgbljGPm3SE9_Tnf9AYBanrNIyRbe3XvPeN4GMg== |
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 Fri, 24 Jul 2026 01:52:19 GMT
Cache-control public,max-age=60
Etag W/"322165f5c8613aa06c68e5dbf398d100"
Vary Accept-Encoding
X-cache RefreshHit from cloudfront
Via 1.1 b823c70c226787b916972c4f07ae29f6.cloudfront.net (CloudFront)
X-amz-cf-pop CDG50-P5
X-amz-cf-id 8-IknC9Kpo-PbvirgbljGPm3SE9_Tnf9AYBanrNIyRbe3XvPeN4GMg==
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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