Technical Information
| HTTP Status Code | 200 |
| HTTP Version | HTTP/1.1 |
| HTTPS | ✔ Available |
| IP Address | 185.199.108.153 |
| Server Software | GitHub.com |
| CDN | CDN (HIT) |
| Compression | gzip |
|
🔒 🟡 Mixed Content (2 HTTP resources) | The page is served over HTTPS but loads 2 resource(s) over HTTP. This may be blocked in modern browsers. |
|
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 185.199.108.153
Server Software GitHub.com
CDN CDN (HIT)
Compression gzip
🔒 🟡 Mixed Content (2 HTTP resources) The page is served over HTTPS but loads 2 resource(s) over HTTP. This may be blocked in modern browsers.
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://powsybl.org:443 | 301 | HTTP/2 301 |
| 2 | https://www.powsybl.org/ | 200 | HTTP/2 200 |
#1 URL https://powsybl.org:443
HTTP Status Code 301
Status HTTP/2 301
#2 URL https://www.powsybl.org/
HTTP Status Code 200
Status HTTP/2 200
Performance
| DNS Lookup | 22.8 ms |
| TCP Connect | 23.9 ms |
| TLS Handshake | 7.3 ms |
| Time To First Byte (TTFB) | 35.2 ms |
| Content Download | 0.2 ms |
| Total Response Time | 35.3 ms |
DNS Lookup 22.8 ms
TCP Connect 23.9 ms
TLS Handshake 7.3 ms
Time To First Byte (TTFB) 35.2 ms
Content Download 0.2 ms
Total Response Time 35.3 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 | Power System Blocks |
Title Power System Blocks
Detected Technologies
| Technology | Bootstrap jQuery Google Analytics |
Technology Bootstrap jQuery Google Analytics
HTTP Headers
| Server
| GitHub.com |
| Content-type
| text/html; charset=utf-8 |
| Last-modified
| Thu, 23 Jul 2026 11:33:41 GMT |
| Access-control-allow-origin
| * |
| Etag
| W/"6a61fc15-4eff" |
| Expires
| Thu, 23 Jul 2026 20:53:19 GMT |
| Cache-control
| max-age=600 |
| Content-encoding
| gzip |
| X-proxy-cache
| MISS |
| X-github-request-id
| F39E:0457:3A1BC5:3A87A7:6A627CE6 |
| Accept-ranges
| bytes |
| Date
| Thu, 23 Jul 2026 20:43:31 GMT |
| Via
| 1.1 varnish |
| Age
| 12 |
| X-served-by
| cache-par-lfpg1960049-PAR |
| X-cache
| HIT |
| X-cache-hits
| 1 |
| X-timer
| S1784839411.474174,VS0,VE2 |
| Vary
| Accept-Encoding |
| X-fastly-request-id
| e9971024c216d6a27997018086000219d84c8a9c |
| Content-length
| 4218 |
Meta Tags
| Viewport | width=device-width, initial-scale=1.0 |
Server GitHub.com
Content-type text/html; charset=utf-8
Last-modified Thu, 23 Jul 2026 11:33:41 GMT
Access-control-allow-origin *
Etag W/"6a61fc15-4eff"
Expires Thu, 23 Jul 2026 20:53:19 GMT
Cache-control max-age=600
Content-encoding gzip
X-proxy-cache MISS
X-github-request-id F39E:0457:3A1BC5:3A87A7:6A627CE6
Accept-ranges bytes
Date Thu, 23 Jul 2026 20:43:31 GMT
Via 1.1 varnish
Age 12
X-served-by cache-par-lfpg1960049-PAR
X-cache HIT
X-cache-hits 1
X-timer S1784839411.474174,VS0,VE2
Vary Accept-Encoding
X-fastly-request-id e9971024c216d6a27997018086000219d84c8a9c
Content-length 4218
