Technical Information
| HTTP Status Code | 200 |
| HTTP Version | HTTP/1.1 |
| HTTPS | ✔ Available |
| IP Address | 15.204.223.162 |
| Server Software | nginx |
| 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 15.204.223.162
Server Software nginx
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 | 13.5 ms |
| TCP Connect | 94.3 ms |
| TLS Handshake | 95.7 ms |
| Time To First Byte (TTFB) | 350.7 ms |
| Content Download | 0.3 ms |
| Total Response Time | 351 ms |
DNS Lookup 13.5 ms
TCP Connect 94.3 ms
TLS Handshake 95.7 ms
Time To First Byte (TTFB) 350.7 ms
Content Download 0.3 ms
Total Response Time 351 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 | calibre - E-book management |
| Meta Description | calibre: The one stop solution for all your e-book needs. Comprehensive e-book software. |
Title calibre - E-book management
Meta Description calibre: The one stop solution for all your e-book needs. Comprehensive e-book software.
Detected Technologies
| Technology | jQuery Google Analytics Google Tag Manager Nginx |
Technology jQuery Google Analytics Google Tag Manager Nginx
HTTP Headers
| Server
| nginx |
| Date
| Wed, 19 Aug 2026 22:23:13 GMT |
| Content-type
| text/html; charset=utf-8 |
| Last-modified
| Fri, 07 Aug 2026 02:06:52 GMT |
| Etag
| W/"6a753dbc-86eb" |
| Content-encoding
| gzip |
Meta Tags
| X-UA-Compatible | IE=Edge |
| Keywords | e-book,ebook,library,calibre,software,news,digital text,free,open source |
| Description | calibre: The one stop solution for all your e-book needs. Comprehensive e-book software. |
Server nginx
Date Wed, 19 Aug 2026 22:23:13 GMT
Content-type text/html; charset=utf-8
Last-modified Fri, 07 Aug 2026 02:06:52 GMT
Etag W/"6a753dbc-86eb"
Content-encoding gzip
