Rsc header and query params always null on middleware

[zecka]

Link to the code that reproduces this issue

https://codesandbox.io/p/devbox/nextjs-middleware-get-rsc-query-params-and-header-vfy9hk?file=%2Fmiddleware.ts%3A23%2C15

To Reproduce

1. Go to https://codesandbox.io/p/devbox/nextjs-middleware-get-rsc-query-params-and-header-vfy9hk?file=%2Fmiddleware.ts%3A23%2C15
2. Open network tab on your browser
3. Clique on link "Page2?test=1"
4. You will a request to "https://vfy9hk-3000.csb.app/page2?test=1&_rsc=1dou9"

Current vs. Expected behavior

Check console query params test is successfully log but _rsc params is null. rsc header is also null

Provide environment information

Operating System:
  Platform: linux
  Arch: x64
  Version: #1 SMP PREEMPT_DYNAMIC Sun Aug  6 20:05:33 UTC 2023
  Available memory (MB): 4102
  Available CPU cores: 2
Binaries:
  Node: 20.9.0
  npm: 9.8.1
  Yarn: 1.22.19
  pnpm: 8.10.2
Relevant Packages:
  next: 14.3.0-canary.63 // Latest available version is detected (14.3.0-canary.63).
  eslint-config-next: N/A
  react: 19.0.0-beta-4508873393-20240430
  react-dom: 19.0.0-beta-4508873393-20240430
  typescript: 5.1.3
Next.js Config:
  output: N/A

Which area(s) are affected? (Select all that apply)

Middleware

Which stage(s) are affected? (Select all that apply)

next dev (local), next build (local), next start (local), Other (Deployed)

Additional context

No response

[tigerabrodi]

@zecka good catch!

Is this the most recent version, Next.js 14.2?

[zecka]

@tigerabrodi Yes I tested it on 14.2 and 14.3 and Both have the issue