Technical Information
| HTTP Status Code | 200 |
| HTTP Version | HTTP/1.1 |
| HTTPS | ✔ Available |
| IP Address | 3.226.139.43 |
| Server Software | AmazonS3 |
| CDN | CDN (Hit from cloudfront) |
| 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 3.226.139.43
Server Software AmazonS3
CDN CDN (Hit from cloudfront)
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).
Redirect Chain
| # | URL | HTTP Status Code | Status |
| 1 | https://crossref.org:443 | 301 | HTTP/2 301 |
| 2 | https://www.crossref.org:443/ | 200 | HTTP/2 200 |
#1 URL https://crossref.org:443
HTTP Status Code 301
Status HTTP/2 301
#2 URL https://www.crossref.org:443/
HTTP Status Code 200
Status HTTP/2 200
Performance
| DNS Lookup | 8.5 ms |
| TCP Connect | 91.3 ms |
| TLS Handshake | 85.4 ms |
| Time To First Byte (TTFB) | 341.5 ms |
| Content Download | 0.2 ms |
| Total Response Time | 341.7 ms |
DNS Lookup 8.5 ms
TCP Connect 91.3 ms
TLS Handshake 85.4 ms
Time To First Byte (TTFB) 341.5 ms
Content Download 0.2 ms
Total Response Time 341.7 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
Detected Technologies
| Technology | Bootstrap jQuery Google Analytics Cloudflare PHP Matomo |
Technology Bootstrap jQuery Google Analytics Cloudflare PHP Matomo
HTTP Headers
| Date
| Sun, 23 Aug 2026 06:41:25 GMT |
| Content-type
| text/html |
| Last-modified
| Thu, 20 Aug 2026 14:32:57 GMT |
| Server
| AmazonS3 |
| X-amz-server-side-encryption
| AES256 |
| Content-encoding
| gzip |
| Etag
| W/"168cbb2d577d3c768622ffa7121730f9" |
| Vary
| Accept-Encoding |
| X-cache
| Hit from cloudfront |
| Via
| 1.1 310ef1a4a092677ec0141510ff32ef7c.cloudfront.net (CloudFront) |
| X-amz-cf-pop
| IAD61-P8 |
| X-amz-cf-id
| rUidVb9bUzdYqj0jWKL_T1kpaHYx0rz_oYjw5imShc8p11ADom5CFQ== |
| Age
| 58097 |
Meta Tags
| Dc:language | en |
| Dc:format | text/html |
| Dc:rights | CC BY 4.0 |
| Dc:source | Crossref |
| Dc:type | website |
| Dc:title | You are Crossref |
Date Sun, 23 Aug 2026 06:41:25 GMT
Content-type text/html
Last-modified Thu, 20 Aug 2026 14:32:57 GMT
Server AmazonS3
X-amz-server-side-encryption AES256
Content-encoding gzip
Etag W/"168cbb2d577d3c768622ffa7121730f9"
Vary Accept-Encoding
X-cache Hit from cloudfront
Via 1.1 310ef1a4a092677ec0141510ff32ef7c.cloudfront.net (CloudFront)
X-amz-cf-pop IAD61-P8
X-amz-cf-id rUidVb9bUzdYqj0jWKL_T1kpaHYx0rz_oYjw5imShc8p11ADom5CFQ==
Age 58097
