Technical Information
| HTTP Status Code | 502 |
| HTTP Version | HTTP/1.1 |
| HTTPS | ✔ Available |
| IP Address | 104.18.37.200 |
| Server Software | cloudflare |
| CDN | Cloudflare |
|
💥 🔴 502 Bad Gateway | The proxy server did not receive a valid response from the upstream server. |
|
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 502
HTTP Version HTTP/1.1
HTTPS ✔ Available
IP Address 104.18.37.200
Server Software cloudflare
CDN Cloudflare
💥 🔴 502 Bad Gateway The proxy server did not receive a valid response from the upstream server.
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.
Performance
| DNS Lookup | 4.1 ms |
| TCP Connect | 6 ms |
| TLS Handshake | 6.5 ms |
| Time To First Byte (TTFB) | 107.7 ms |
| Content Download | 0.1 ms |
| Total Response Time | 107.8 ms |
DNS Lookup 4.1 ms
TCP Connect 6 ms
TLS Handshake 6.5 ms
Time To First Byte (TTFB) 107.7 ms
Content Download 0.1 ms
Total Response Time 107.8 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 Error - Substack
Detected Technologies
Technology Cloudflare
HTTP Headers
| Date | Sun, 30 Aug 2026 22:06:41 GMT |
| Content-type | text/html; charset=UTF-8 |
| Cf-ray | a3371aa68a7ad086-CDG |
| 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 |
| Server | cloudflare |
| X-frame-options | SAMEORIGIN |
| Referrer-policy | same-origin |
| Set-cookie | __cf_bm=9EVRn49aMhMsi9CrhGhlHslKguw5Z22RJPYoHpaibZ4-1788127601.686322-1.0.1.1-TFWRP0l2Euuw9EzxUFS_mHf9fZ0EcE2b9gS0GdlRq6iwIBIdOwsffeDspKbtz7yUbijIDObisTZA5up9TfRJ..wfxOzBOKQo1ofsFxe0hhUbADqlVd4pjUmD5HvNkd3x; HttpOnly; SameSite=None; Secure; Path=/; Domain=substack.com; Expires=Sun, 30 Aug 2026 22:36:41 GMT |
| Alt-svc | h3=":443"; ma=86400 |
Meta Tags
| Viewport | width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0 |
Date Sun, 30 Aug 2026 22:06:41 GMT
Content-type text/html; charset=UTF-8
Cf-ray a3371aa68a7ad086-CDG
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
Server cloudflare
X-frame-options SAMEORIGIN
Referrer-policy same-origin
Set-cookie __cf_bm=9EVRn49aMhMsi9CrhGhlHslKguw5Z22RJPYoHpaibZ4-1788127601.686322-1.0.1.1-TFWRP0l2Euuw9EzxUFS_mHf9fZ0EcE2b9gS0GdlRq6iwIBIdOwsffeDspKbtz7yUbijIDObisTZA5up9TfRJ..wfxOzBOKQo1ofsFxe0hhUbADqlVd4pjUmD5HvNkd3x; HttpOnly; SameSite=None; Secure; Path=/; Domain=substack.com; Expires=Sun, 30 Aug 2026 22:36:41 GMT
Alt-svc h3=":443"; ma=86400
