nixos/nginx: forceSSL option forces MIME to text/html on redirect

[KiaraGrouwstra]

Nixpkgs version

• Unstable (25.05)

Describe the bug

the nginx service's forceSSL option seems to force Content-Type to text/html on redirect.

Steps to reproduce

1. use nginx with services.nginx.virtualHosts.<name>.forceSSL = true;
2. make an HTTP request to it over http:// to trigger a redirect (say for a .txt file)
3. find Content-Type response header text/html (rather than the expected text/plain expected for a .txt file)

Expected behaviour

MIME types left intact

Screenshots

No response

Relevant log output

Additional context

No response

System metadata

• system: "x86_64-linux"
• host os: Linux 6.12.2-zen1, NixOS, 24.11 (Vicuna), 24.11.20250102.c1df670
• multi-user?: yes
• sandbox: yes
• version: nix-env (Lix, like Nix) 2.91.1 System type: x86_64-linux Additional system types: aarch64-linux, i686-linux Features: gc, signed-caches System configuration file: /etc/nix/nix.conf User configuration files: /home/kiara/.config/nix/nix.conf:/nix/store/pa0mhac3p1q1fdz7w13dl13k19a7vd7z-stylix-kde-config${XDG_CONFIG_DIRS/nix/nix.conf:+/nix/nix.conf:$XDG_CONFIG_DIRS}/nix/nix.conf Store directory: /nix/store State directory: /nix/var/nix Data directory: /nix/store/bimspgs3cpapsbz7a2vi690916fgrvs5-lix-2.91.1/share
• nixpkgs: /run/current-system/nixpkgs

Notify maintainers

pinging nginx package's listed maintainers (given the core module seems not to list any):
@fpletz @RaitoBezarius @dasJ @Conni2461 @helsinki-Jo @ulrikstrid

I assert that this issue is relevant for Nixpkgs

• I assert that this is a bug and not a support request.
• I assert that this is not a duplicate of an existing issue.
• I assert that I have read the NixOS Code of Conduct and agree to abide by it.

Is this issue important to you?

No response