Technical Information
| HTTP Status Code | 403 |
| HTTP Version | HTTP/1.1 |
| HTTPS | ✔ Available |
| IP Address | 104.19.190.84 |
| Server Software | cloudflare |
| CDN | Cloudflare |
| Compression | gzip |
|
🚫 🟡 HTTP 403 Error | The server returned a 403 error. Check the access configuration. |
|
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. |
HTTP Status Code 403
HTTP Version HTTP/1.1
HTTPS ✔ Available
IP Address 104.19.190.84
Server Software cloudflare
CDN Cloudflare
Compression gzip
🚫 🟡 HTTP 403 Error The server returned a 403 error. Check the access configuration.
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.
Redirect Chain
| # | URL | HTTP Status Code | Status |
| 1 | https://vitalsource.com:443 | 301 | HTTP/2 301 |
| 2 | https://www.vitalsource.com/ | 403 | HTTP/2 403 |
#1 URL https://vitalsource.com:443
HTTP Status Code 301
Status HTTP/2 301
#2 URL https://www.vitalsource.com/
HTTP Status Code 403
Status HTTP/2 403
Performance
| DNS Lookup | 22.8 ms |
| TCP Connect | 24.2 ms |
| TLS Handshake | 8.6 ms |
| Time To First Byte (TTFB) | 60.3 ms |
| Content Download | 0.1 ms |
| Total Response Time | 60.4 ms |
DNS Lookup 22.8 ms
TCP Connect 24.2 ms
TLS Handshake 8.6 ms
Time To First Byte (TTFB) 60.3 ms
Content Download 0.1 ms
Total Response Time 60.4 ms
Security
| HTTPS | ✔ Enabled |
| HSTS | ✘ Not configured |
| CSP | ⚠ Not configured |
| X-Frame-Options | ✔ SAMEORIGIN |
| X-Content-Type-Options | ⚠ Not configured |
| Referrer Policy | same-origin |
| HTTP/2 | ⚠ HTTP/1.1 |
HTTPS ✔ Enabled
HSTS ✘ Not configured
CSP ⚠ Not configured
X-Frame-Options ✔ SAMEORIGIN
X-Content-Type-Options ⚠ Not configured
Referrer Policy same-origin
HTTP/2 ⚠ HTTP/1.1
SEO Quick Check
| Title | Attention Required! | Cloudflare |
| Robots Meta | noindex, nofollow |
Title Attention Required! | Cloudflare
Robots Meta noindex, nofollow
Detected Technologies
Technology Cloudflare
HTTP Headers
| Date | Thu, 23 Jul 2026 10:41:56 GMT |
| Content-type | text/html; charset=UTF-8 |
| Cache-control | private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0 |
| Expires | Thu, 01 Jan 1970 00:00:01 GMT |
| Referrer-policy | same-origin |
| X-frame-options | SAMEORIGIN |
| Vary | accept-encoding |
| Content-encoding | gzip |
| Server | cloudflare |
| Cf-ray | a1fa13556e8f0477-CDG |
| Alt-svc | h3=":443"; ma=86400 |
Meta Tags
| Content-Type | text/html; charset=UTF-8 |
| X-UA-Compatible | IE=Edge |
| Robots | noindex, nofollow |
| Viewport | width=device-width,initial-scale=1 |
Date Thu, 23 Jul 2026 10:41:56 GMT
Content-type text/html; charset=UTF-8
Cache-control private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Expires Thu, 01 Jan 1970 00:00:01 GMT
Referrer-policy same-origin
X-frame-options SAMEORIGIN
Vary accept-encoding
Content-encoding gzip
Server cloudflare
Cf-ray a1fa13556e8f0477-CDG
Alt-svc h3=":443"; ma=86400
