Ich habe weitere Contao-Installationen bei Strato getestet. Am fehlenden Content-Length Header liegt es vermutlich nicht:
curl -I https://domain-a.de/sitemap.xml (wird von der Google Search Console nicht erkannt)
Code:
HTTP/1.1 200 OK
Content-Type: application/xml; charset=UTF-8
Connection: keep-alive
X-WS-Origin: available
X-WS-RateLimit-Limit: 1000
X-WS-RateLimit-Remaining: 999
server: Apache
x-frame-options: SAMEORIGIN
x-content-digest: en6b38d81a77e31905e0ca51387a4153cc
contao-cache: fresh
date: Mon, 15 Jun 2026 11:00:49 GMT
x-content-type-options: nosniff
vary: Origin,Cookie
x-xss-protection: 1; mode=block
age: 957
cache-control: public, s-maxage=2592000
referrer-policy: no-referrer-when-downgrade, strict-origin-when-cross-origin
strict-transport-security: max-age=31536000
curl -I https://domain-b.de/sitemap.xml (wird von der Google Search Console erkannt)
Code:
HTTP/1.1 200 OK
Content-Type: application/xml; charset=UTF-8
Connection: keep-alive
X-WS-Origin: available
X-WS-RateLimit-Limit: 1000
X-WS-RateLimit-Remaining: 999
server: Apache
permissions-policy: interest-cohort=()
x-frame-options: SAMEORIGIN
x-content-digest: en7da9646a9822f13573e3a9a4555ecce60fc8114cc5163844c261ecbd6b542283
contao-cache: fresh
date: Mon, 15 Jun 2026 11:00:53 GMT
x-content-type-options: nosniff
vary: Origin,Cookie
x-xss-protection: 1; mode=block
age: 437583
cache-control: public, s-maxage=2592000
referrer-policy: no-referrer-when-downgrade, strict-origin-when-cross-origin