cnx.org - Secure (SSL) - ОНЛАЙН

Проверка результатов для: cnx.org

cnx.org ОНЛАЙН

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Дополнительная информация for https://cnx.org

Technical Information

HTTP Status Code	200
HTTP Version	HTTP/1.1
HTTPS	✔ Available
IP Address	18.164.52.68
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 18.164.52.68
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).

Redirect Chain

#	URL	HTTP Status Code	Status
1	https://cnx.org:443	301	HTTP/2 301
2	https://openstax.org	200	HTTP/2 200

#1 URL https://cnx.org:443
HTTP Status Code 301
Status HTTP/2 301

#2 URL https://openstax.org
HTTP Status Code 200
Status HTTP/2 200

Performance

DNS Lookup	10.6 ms
TCP Connect	11.7 ms
TLS Handshake	7.9 ms
Time To First Byte (TTFB)	139.7 ms
Content Download	0.1 ms
Total Response Time	139.8 ms

DNS Lookup 10.6 ms
TCP Connect 11.7 ms
TLS Handshake 7.9 ms
Time To First Byte (TTFB) 139.7 ms
Content Download 0.1 ms
Total Response Time 139.8 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	Tue, 28 Jul 2026 16:54:37 GMT
X-amz-version-id	.PvQZ8Jte5WIAAFnRUWmQ3i4TKFP7X8d
Content-encoding	gzip
Server	AmazonS3
Date	Thu, 20 Aug 2026 00:29:14 GMT
Cache-control	public,max-age=60
Etag	W/"ffe81e53fda21f55216cc9a9352dd2da"
Vary	Accept-Encoding
X-cache	RefreshHit from cloudfront
Via	1.1 d71d883968dd731918a3ab9609f88bec.cloudfront.net (CloudFront)
X-amz-cf-pop	CDG50-P5
X-amz-cf-id	RMaAXm-Nc5IJs-pLJBlTgbNS89l5plteCmZ4cTTC7ufIDjj_BhH4EQ==

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
Content-encoding gzip
Server AmazonS3
Date Thu, 20 Aug 2026 00:29:14 GMT
Cache-control public,max-age=60
Etag W/"ffe81e53fda21f55216cc9a9352dd2da"
Vary Accept-Encoding
X-cache RefreshHit from cloudfront
Via 1.1 d71d883968dd731918a3ab9609f88bec.cloudfront.net (CloudFront)
X-amz-cf-pop CDG50-P5
X-amz-cf-id RMaAXm-Nc5IJs-pLJBlTgbNS89l5plteCmZ4cTTC7ufIDjj_BhH4EQ==

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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Проверка результатов для: cnx.org

cnx.org ОНЛАЙН

Дополнительная информация for https://cnx.org

Technical Information

Redirect Chain

Performance

Security

SEO Quick Check

HTTP Headers

Meta Tags

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