Spring Boot firewall behind Apache2: malicious String "//" - spring-boot

Question

I am using a Spring Boot fat jar for serving backend and static files. I need to let it run behind an apache2. But I am getting the malicious string errors for "//" from the firewall:
org.springframework.security.web.firewall.RequestRejectedException: The request was rejected because the URL contained a potentially malicious String "//"
at org.springframework.security.web.firewall.StrictHttpFirewall.rejectedBlacklistedUrls(StrictHttpFirewall.java:369) ~[spring-security-web-5.2.1.RELEASE.jar!/:5.2.1.RELEASE]
at org.springframework.security.web.firewall.StrictHttpFirewall.getFirewalledRequest(StrictHttpFirewall.java:336) ~[spring-security-web-5.2.1.RELEASE.jar!/:5.2.1.RELEASE]
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:194) ~[spring-security-web-5.2.1.RELEASE.jar!/:5.2.1.RELEASE]
...
My application properties are:
server:
port: 9001
address: 127.0.0.1
forward-headers-strategy: framework
And my apache2 virtual host is:
<VirtualHost *:80>
ServerName XXX
ProxyPreserveHost on
RequestHeader set X-Forwarded-Proto https
RequestHeader set X-Forwarded-Port 443
ProxyPass / http://localhost:9001/
ProxyPassReverse / http://localhost:9001/
RewriteEngine on
RewriteCond %{SERVER_NAME} =XXX
RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [END,NE,R=permanent]
</VirtualHost>
Where "XXX" is the servername.
What am I missing here? I don't really want to reconfigure the firewall because I think there must be a solution without changing it.

Answer 1

To answer my question: I forgot to change the ssl confgiuration with:
<VirtualHost *:443>
...
</VirtualHost>
So if you have the same problem it may be the missing changes in the right config.