使用docker镜像的curl，我得到了一些诊断。我运行：

docker run --rm --add-host=my.domain.com:10.10.7.13 ymuski/curl-http3 curl --http3 --verbose https://my.domain.com/

字符串
与Google比较：

docker run --rm ymuski/curl-http3 curl --http3 --verbose https://www.google.com/

型
我的输出是：

*  CAfile: /etc/ssl/certs/ca-certificates.crt
*  CApath: none
*   Trying 10.10.7.13:443...
* Connected to my.domaine.com (10.10.7.13) port 443
* ALPN: offers h2,http/1.1
} [5 bytes data]
* TLSv1.2 (OUT), TLS handshake, Client hello (1):
} [512 bytes data]
*  CAfile: /etc/ssl/certs/ca-certificates.crt
*  CApath: none
{ [5 bytes data]
* TLSv1.2 (IN), TLS handshake, Server hello (2):
{ [122 bytes data]
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
} [1 bytes data]
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
{ [45 bytes data]
* TLSv1.3 (IN), TLS handshake, Certificate (11):
{ [4030 bytes data]
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
{ [264 bytes data]
* TLSv1.3 (IN), TLS handshake, Finished (20):
{ [36 bytes data]
* TLSv1.3 (OUT), TLS handshake, Finished (20):
} [36 bytes data]
* SSL connection using TLSv1.3 / TLS_AES_128_GCM_SHA256
* ALPN: server accepted h2
* Server certificate:
*  subject: CN=*.internal.inetsoftware.de
*  start date: Oct  3 10:15:24 2023 GMT
*  expire date: Jan  1 10:15:23 2024 GMT
*  subjectAltName: host "my.domaine.com" matched cert's "*.domaine.com"
*  issuer: C=US; O=Let's Encrypt; CN=R3
*  SSL certificate verify ok.
} [5 bytes data]
* using HTTP/2
* h2 [:method: GET]
* h2 [:scheme: https]
* h2 [:authority: my.domaine.com]
* h2 [:path: /]
* h2 [user-agent: curl/8.2.1-DEV]
* h2 [accept: */*]
* Using Stream ID: 1
} [5 bytes data]
> GET / HTTP/2
> Host: my.domaine.com
> User-Agent: curl/8.2.1-DEV
> Accept: */*

型
Google的输出是：

*  CAfile: /etc/ssl/certs/ca-certificates.crt
*  CApath: none
*  subjectAltName: host "www.google.com" matched cert's "*.google.com"
* Connected to www.google.com (142.250.184.196) port 443
* using HTTP/3
* Using HTTP/3 Stream ID: 0
> GET / HTTP/3
> Host: www.google.com
> User-Agent: curl/8.2.1-DEV
> Accept: */*

型
似乎是ALPN的问题。
编辑：问题是缺少乳蛋饼图书馆。码头然后简单地没有回应。