[bug] Incorrect Content-Type for tauri schema server (text/plain instead of application/json)

[TDoraX]

Describe the bug

The JSON schema (and other versioned config schemas) is currently returned with the HTTP header Content-Type: text/plain; charset=utf-8.

Most of JetBrains IDEs (RustRover, WebStorm, etc.) v2026.1.x fails to recognize it as a JSON schema, resulting in a total loss of Autocompletion for tauri.conf.json and tauri.conf.json5.

(VS Code is able to parse the text/plain correctly)

Reproduction

curl -I https://schema.tauri.app/config/2

Expected behavior

Expected: content-type: application/json; charset=utf-8
Actual: content-type: text/plain; charset=utf-8

Full tauri info output

[✔] Environment
    - OS: Mac OS 26.4.1 arm64 (X64)
    ✔ Xcode Command Line Tools: installed
    ✔ Xcode: 26.4.1
    ✔ rustc: 1.95.0 (59807616e 2026-04-14)
    ✔ cargo: 1.95.0 (f2d3ce0bd 2026-03-21)
    ✔ rustup: 1.29.0 (28d1352db 2026-03-05)
    ✔ Rust toolchain: stable-aarch64-apple-darwin (default)
    - node: 24.14.1
    - pnpm: 9.15.9
    - yarn: 1.22.22
    - npm: 11.12.0
    - bun: 1.3.12

[-] Packages
    - tauri 🦀: 2.10.3
    - tauri-build 🦀: 2.5.6
    - wry 🦀: 0.54.4, (outdated, latest: 0.55.0)
    - tao 🦀: 0.34.8, (outdated, latest: 0.35.0)
    - tauri-cli 🦀: 2.10.1
    - @tauri-apps/api  ⱼₛ: 2.10.1
    - @tauri-apps/cli  ⱼₛ: 2.10.1

[-] Plugins
    - tauri-plugin-single-instance 🦀: 2.4.1
    - @tauri-apps/plugin-single-instance  ⱼₛ: not installed!
    - tauri-plugin-store 🦀: 2.4.2
    - @tauri-apps/plugin-store  ⱼₛ: 2.4.2
    - tauri-plugin-log 🦀: 2.8.0
    - @tauri-apps/plugin-log  ⱼₛ: 2.8.0
    - tauri-plugin-updater 🦀: 2.10.1
    - @tauri-apps/plugin-updater  ⱼₛ: 2.10.1

[-] App
    - build-type: bundle
    - CSP: unset
    - frontendDist: ../dist
    - framework: React

Stack trace

Additional context

• I have tried running a local proxy server that fetches the official schema and overrides the Content-Type to application/json. Autocompletion in RustRover/WebStorm starts working.
• Then I changed Content-Type to text/plain, and invalidated IDE cache, it fails again.
• By changing the $schema to a local file path: "$schema": "../node_modules/@tauri-apps/cli/config.schema.json", it works perfectly.

Remote JSON schema (doesn't work)

Local JSON schema (works)

Local Proxy use application/json (works)

Local Proxy use text/plain (doesn't work)