Technical Information
| HTTP Status Code | 200 |
| HTTP Version | HTTP/1.1 |
| HTTPS | ✔ Available |
| IP Address | 195.169.88.174 |
| Server Software | nginx |
| Compression | gzip |
|
🔒 🟡 Mixed Content (1 HTTP resources) | The page is served over HTTPS but loads 1 resource(s) over HTTP. This may be blocked in modern browsers. |
|
ℹ 🔵 Missing Content Security Policy | CSP is not configured. It helps prevent XSS attacks and content injection. |
HTTP Status Code 200
HTTP Version HTTP/1.1
HTTPS ✔ Available
IP Address 195.169.88.174
Server Software nginx
Compression gzip
🔒 🟡 Mixed Content (1 HTTP resources) The page is served over HTTPS but loads 1 resource(s) over HTTP. This may be blocked in modern browsers.
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://iisg.nl:443 | 301 | HTTP/2 301 |
| 2 | https://iisg.amsterdam/ | 301 | HTTP/2 301 |
| 3 | https://iisg.amsterdam/nl | 200 | HTTP/2 200 |
#1 URL https://iisg.nl:443
HTTP Status Code 301
Status HTTP/2 301
#2 URL https://iisg.amsterdam/
HTTP Status Code 301
Status HTTP/2 301
#3 URL https://iisg.amsterdam/nl
HTTP Status Code 200
Status HTTP/2 200
Performance
| DNS Lookup | 0.4 ms |
| TCP Connect | 14 ms |
| TLS Handshake | 38.3 ms |
| Time To First Byte (TTFB) | 76 ms |
| Content Download | 4.1 ms |
| Total Response Time | 80.1 ms |
DNS Lookup 0.4 ms
TCP Connect 14 ms
TLS Handshake 38.3 ms
Time To First Byte (TTFB) 76 ms
Content Download 4.1 ms
Total Response Time 80.1 ms
Security
| HTTPS | ✔ Enabled |
| HSTS | ✔ max-age=31536000; includeSubDomains |
| CSP | ⚠ Not configured |
| X-Frame-Options | ✔ SAMEORIGIN |
| X-Content-Type-Options | ✔ nosniff |
| HTTP/2 | ⚠ HTTP/1.1 |
HTTPS ✔ Enabled
HSTS ✔ max-age=31536000; includeSubDomains
CSP ⚠ Not configured
X-Frame-Options ✔ SAMEORIGIN
X-Content-Type-Options ✔ nosniff
HTTP/2 ⚠ HTTP/1.1
SEO Quick Check
| Title | IISG | Internationaal Instituut voor Sociale Geschiedenis |
| Canonical | https://iisg.amsterdam/nl |
| Twitter Card | summary |
Title IISG | Internationaal Instituut voor Sociale Geschiedenis
Canonical https://iisg.amsterdam/nl
Twitter Card summary
Detected Technologies
| Technology | Drupal Google Analytics Cloudflare Nginx |
Technology Drupal Google Analytics Cloudflare Nginx
HTTP Headers
| Server
| nginx |
| Date
| Wed, 26 Aug 2026 19:18:08 GMT |
| Content-type
| text/html; charset=UTF-8 |
| X-content-type-options
| nosniff |
| Cache-control
| max-age=3600, public |
| X-drupal-dynamic-cache
| MISS |
| Content-language
| nl |
| X-frame-options
| SAMEORIGIN |
| Expires
| Sun, 19 Nov 1978 05:00:00 GMT |
| Last-modified
| Mon, 24 Aug 2026 10:36:53 GMT |
| Etag
| "1787567813-gzip" |
| Vary
| Cookie,Accept-Encoding |
| X-generator
| Drupal 10 (https://www.drupal.org) |
| X-drupal-cache
| HIT |
| Content-encoding
| gzip |
| Strict-transport-security
| max-age=31536000; includeSubDomains |
Meta Tags
| Generator | Drupal 10 (https://www.drupal.org) |
| MobileOptimized | width |
| HandheldFriendly | true |
| Viewport | width=device-width, initial-scale=1.0 |
Server nginx
Date Wed, 26 Aug 2026 19:18:08 GMT
Content-type text/html; charset=UTF-8
X-content-type-options nosniff
Cache-control max-age=3600, public
X-drupal-dynamic-cache MISS
Content-language nl
X-frame-options SAMEORIGIN
Expires Sun, 19 Nov 1978 05:00:00 GMT
Last-modified Mon, 24 Aug 2026 10:36:53 GMT
Etag "1787567813-gzip"
Vary Cookie,Accept-Encoding
X-generator Drupal 10 (https://www.drupal.org)
X-drupal-cache HIT
Content-encoding gzip
Strict-transport-security max-age=31536000; includeSubDomains
