HTTP Headers Analysis for https://lettersender.app

Detected Technologies from Headers

See all in URL Inspect 2

Google Static File Front End

Express

HTTP Security Headers

Status

Strict-Transport-Security

Good

max-age=63072000; includeSubDomains

Content-Security-Policy

Missing

Not configured Analyze

Content-Security-Policy-Report-Only

Missing

Not configured Analyze

X-Frame-Options

Missing

Not configured

X-Content-Type-Options

Missing

Not configured

Referrer-Policy

Missing

Not configured

Permissions-Policy

Missing

Not configured

Recommendations

• Consider adding 'preload' to HSTS for maximum security
• Add Content-Security-Policy header to prevent XSS attacks
• Add X-Frame-Options: DENY or SAMEORIGIN to prevent clickjacking
• Add X-Content-Type-Options: nosniff
• Add Referrer-Policy header (recommended: strict-origin-when-cross-origin)
• Consider adding Permissions-Policy to control browser features

Performance Headers

Connection

Performance

close

connection: close

Caching Headers

Cache-Control

Caching

private

Etag

Caching

W/"11efb-2+8yRLI6xl0bUhz+K9Tp4ECGtcM"

Expires

Caching

Wed, 29 Apr 2026 02:35:12 GMT

cache-control: private
etag: W/"11efb-2+8yRLI6xl0bUhz+K9Tp4ECGtcM"
expires: Wed, 29 Apr 2026 02:35:12 GMT

Content Headers

Content-Length

Content

73467

Content-Type

Content

text/html; charset=utf-8

content-length: 73467
content-type: text/html; charset=utf-8

Server Headers

Server

Google Frontend

X-Powered-By

Server

Express

server: Google Frontend
x-powered-by: Express

CORS Headers

No CORS headers found

Cookies Headers

Set-Cookie

Cookies

set-cookie: GAESA=Cp4BMDA4YzE1ZmYwODU5NmE1YTgyZGY1ZjZmMzk4YjQ1NDVjMjdhY2EzZTBiYTAyMzQ4MGRjODFhYWI0N2RlMmYzMTQ3NmZkOTgyNzc0MWNlMTYyNWQzNjY1ZmE4ZTY5ODMyOTFhYjJkNWUxZTE1MjljNThjYjcxOGYyOTkzMjBjNDdjNGE1Nzk0MmMwMTlhZTZiNDE0ZDZlNDBkNmVlMzQQ19HcuN0z; expires=Fri, 29-May-2026 02:35:12 GMT; path=/

Other Headers

Alt-Svc

Other

h3=":443"; ma=2592000,h3-29=":443"; ma=2592000

Date

Other

Wed, 29 Apr 2026 02:35:12 GMT

Via

Other

1.1 google

X-Cloud-Trace-Context

Other

71c5be6bad29e89590f29fd7ce1afb4b;o=1

alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
date: Wed, 29 Apr 2026 02:35:12 GMT
via: 1.1 google
x-cloud-trace-context: 71c5be6bad29e89590f29fd7ce1afb4b;o=1

Recommendations

Enable compression (gzip/brotli) to improve performance

Consider removing X-Powered-By header to hide server technology