RBR750 / RBS750 accessible behind reverse proxy

[MistralBerck]

4.6.9.11 => RBR and RBS accessible behind reverse proxy 4.6.14.3 => RBR and RBS not accessible behind reverse proxy

Tested with 2 different network, with same configuration
1°) 9.11 : works

2)° upgrade to 14.3

3°) 14.3 : doesn't work

4°) downgrade to 9.11

5°) 9.11 : works

They probably modif