w3schools.com - Secure (SSL)

检查结果： w3schools.com

w3schools.com 是在线的

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额外信息针对 https://w3schools.com

Technical Information

HTTP Status Code	200
HTTP Version	HTTP/1.1
HTTPS	✔ Available
IP Address	13.248.240.135
Compression	gzip
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 13.248.240.135
Compression gzip
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://w3schools.com:443	301	HTTP/2 301
2	https://www.w3schools.com:443/	200	HTTP/2 200

#1 URL https://w3schools.com:443
HTTP Status Code 301
Status HTTP/2 301

#2 URL https://www.w3schools.com:443/
HTTP Status Code 200
Status HTTP/2 200

Performance

DNS Lookup	29 ms
TCP Connect	30.7 ms
TLS Handshake	6.2 ms
Time To First Byte (TTFB)	86.1 ms
Content Download	1.9 ms
Total Response Time	88 ms

DNS Lookup 29 ms
TCP Connect 30.7 ms
TLS Handshake 6.2 ms
Time To First Byte (TTFB) 86.1 ms
Content Download 1.9 ms
Total Response Time 88 ms

Security

HTTPS	✔ Enabled
HSTS	✔ max-age=86400
CSP	✔ Configured
X-Frame-Options	⚠ Not configured
X-Content-Type-Options	⚠ Not configured
HTTP/2	⚠ HTTP/1.1

HTTPS ✔ Enabled
HSTS ✔ max-age=86400
CSP ✔ Configured
X-Frame-Options ⚠ Not configured
X-Content-Type-Options ⚠ Not configured
HTTP/2 ⚠ HTTP/1.1

SEO Quick Check

Title	W3Schools Online Web Tutorials
Meta Description	Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.
Open Graph Description	W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more.
Open Graph Image	https://www.w3schools.com/images/w3schools_logo_436_2.png
Twitter Card	summary
Twitter Title	W3Schools.com
Twitter Description	W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more.
Twitter Image	https://www.w3schools.com/images/w3schools_logo_436_2.png

Title W3Schools Online Web Tutorials
Meta Description Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.
Open Graph Description W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more.
Open Graph Image https://www.w3schools.com/images/w3schools_logo_436_2.png
Twitter Card summary
Twitter Title W3Schools.com
Twitter Description W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more.
Twitter Image https://www.w3schools.com/images/w3schools_logo_436_2.png

Detected Technologies

Technology	React Vue.js Angular Bootstrap Google Analytics Google Tag Manager PHP Node.js

Technology React Vue.js Angular Bootstrap Google Analytics Google Tag Manager PHP Node.js

HTTP Headers

Content-type	text/html
Content-security-policy	frame-ancestors 'self' https://mycourses.w3schools.com https://pathfinder.w3schools.com; upgrade-insecure-requests
X-content-security-policy	frame-ancestors 'self' https://mycourses.w3schools.com https://pathfinder.w3schools.com;
Vary	Accept-Encoding
Content-encoding	gzip
Content-length	44550
Cache-control	public, max-age=6940
Expires	Thu, 27 Aug 2026 13:03:17 GMT
Date	Thu, 27 Aug 2026 11:07:37 GMT
X-loc	true
Strict-transport-security	max-age=86400

Meta Tags

Viewport	width=device-width, initial-scale=1
Title	W3Schools.com
Keywords	HTML, Python, CSS, SQL, JavaScript, How to, PHP, Java, C, C++, C#, jQuery, Bootstrap, Colors, W3.CSS, XML, MySQL, Icons, NodeJS, React, Graphics, Angular, R, AI, Git, Data Science, Code Game, Tutorials, Programming, Web Development, Training, Learning, Quiz, Exercises, Courses, Lessons, References, Examples, Learn to code, Source code, Demos, Tips, Website
Description	Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.
Msapplication-TileColor	#00a300
Theme-color	#ffffff
Format-detection	telephone=no

Content-type text/html
Content-security-policy frame-ancestors 'self' https://mycourses.w3schools.com https://pathfinder.w3schools.com; upgrade-insecure-requests
X-content-security-policy frame-ancestors 'self' https://mycourses.w3schools.com https://pathfinder.w3schools.com;
Vary Accept-Encoding
Content-encoding gzip
Content-length 44550
Cache-control public, max-age=6940
Expires Thu, 27 Aug 2026 13:03:17 GMT
Date Thu, 27 Aug 2026 11:07:37 GMT
X-loc true
Strict-transport-security max-age=86400

Viewport width=device-width, initial-scale=1
Title W3Schools.com
Keywords HTML, Python, CSS, SQL, JavaScript, How to, PHP, Java, C, C++, C#, jQuery, Bootstrap, Colors, W3.CSS, XML, MySQL, Icons, NodeJS, React, Graphics, Angular, R, AI, Git, Data Science, Code Game, Tutorials, Programming, Web Development, Training, Learning, Quiz, Exercises, Courses, Lessons, References, Examples, Learn to code, Source code, Demos, Tips, Website
Description Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.
Og:image

Og:image:type image/png
Og:image:width 436
Og:image:height 228
Og:description W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more.
Twitter:card summary
Twitter:site @w3schools
Twitter:title W3Schools.com
Twitter:description W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more.
Twitter:image

Msapplication-TileColor #00a300
Theme-color #ffffff
Format-detection telephone=no

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检查结果： w3schools.com

w3schools.com 是在线的

额外信息针对 https://w3schools.com

Technical Information

Redirect Chain

Performance

Security

SEO Quick Check

Detected Technologies

HTTP Headers

Meta Tags

也可查询 w3schools.com

DNS

Whois

Hosts

最新查询

额外信息 针对 https://w3schools.com

Technical Information

Redirect Chain

Performance

Security

SEO Quick Check

Detected Technologies

HTTP Headers

Meta Tags

也可查询 w3schools.com

DNS

Whois

Hosts

最新查询

额外信息针对 https://w3schools.com