Environment variable REQUEST_SCHEME is not reliable

[bschmalhofer]

When testing migration.pl under Docker via HTTP I found that there is no warning about using HTTP
The cause seems to be that the env var REQUEST_SCHEME is not set when running unter Gazelle.

grep -r REQUEST_SCHEME .
./Kernel/Output/HTML/Templates/Standard/MigrateFromOTRS/Intro.tt:[% IF Env("REQUEST_SCHEME") == 'http' %]

This is expected as the source of that info should be $ParamObject->HTTPS('HTTPS').

A related effect is that on the Intro page of migration.pl the 'Continue' button is not visible when runnung under Gazelle.

TODO:

• Handle the check HTTP vs. HTTPS the same way as in Kernel::Modules::Installer.

• Test with HTTP

• Test with HTTPS

[bschmalhofer]

Continue button is now visible under HTTP and HTTPS. Closing the issue.