HTTP Headers Analysis for https://webmail.1und1.de

Detected Technologies from Headers

See all in URL Inspect 3

Apache

Debian

IONOS

HTTP Security Headers

Status

Strict-Transport-Security

Present

max-age=31556926

Content-Security-Policy

Good

default-src; frame-src Analyze

Content-Security-Policy-Report-Only

Missing

Not configured Analyze

X-Frame-Options

Good

SAMEORIGIN

X-Content-Type-Options

Good

nosniff

Referrer-Policy

Missing

Not configured

Permissions-Policy

Missing

Not configured

Recommendations

• Increase HSTS max-age to at least 1 year and add includeSubDomains
• Strengthen CSP by removing 'unsafe-eval'
• Add Referrer-Policy header (recommended: strict-origin-when-cross-origin)
• Consider adding Permissions-Policy to control browser features

Performance Headers

Accept-Ranges

Performance

bytes

Connection

Performance

close

Vary

Performance

Accept-Encoding,User-Agent

accept-ranges: bytes
connection: close
vary: Accept-Encoding,User-Agent

Caching Headers

Cache-Control

Caching

max-age=0

Etag

Caching

"1f05-5bd93d8ff3780"

Expires

Caching

Thu, 30 Jul 2026 06:00:21 GMT

Last-Modified

Caching

Mon, 15 Mar 2021 14:13:02 GMT

cache-control: max-age=0
etag: "1f05-5bd93d8ff3780"
expires: Thu, 30 Jul 2026 06:00:21 GMT
last-modified: Mon, 15 Mar 2021 14:13:02 GMT

Content Headers

Content-Length

Content

7941

Content-Type

Content

text/html; charset=UTF-8

content-length: 7941
content-type: text/html; charset=UTF-8

Server Headers

Server

Apache/2.4.68 (Debian)

server: Apache/2.4.68 (Debian)

CORS Headers

No CORS headers found

Cookies Headers

No cookies headers found

Other Headers

Date

Other

Thu, 30 Jul 2026 06:00:21 GMT

date: Thu, 30 Jul 2026 06:00:21 GMT

Recommendations

Enable compression (gzip/brotli) to improve performance