Forwarded request headers are null

[razvanMiu]

Link to the code that reproduces this issue

https://github.com/razvanMiu/nextjs-forwarded-headers-issue

To Reproduce

1. Start application in development (npm run dev)
2. Check logged value of X-Forwarded-Host header

Current vs. Expected behavior

Following the steps from the previous section, I expected the X-Forwarded-Host to return the current host but I get null instead.
I use X-Forwarded-Host to forward the server name of nginx and it worked as expected in nextjs <= 13.4.12

Verify canary release

• I verified that the issue exists in the latest Next.js canary release

Provide environment information

Operating System:
      Platform: darwin
      Arch: arm64
      Version: Darwin Kernel Version 22.5.0: Mon Apr 24 20:52:24 PDT 2023; root:xnu-8796.121.2~5/RELEASE_ARM64_T6000
    Binaries:
      Node: 20.5.1
      npm: 9.8.0
      Yarn: N/A
      pnpm: N/A
    Relevant Packages:
      next: 13.5.2
      eslint-config-next: 13.5.2
      react: 18.2.0
      react-dom: 18.2.0
      typescript: 5.2.2
    Next.js Config:
      output: N/A

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

Not sure

Additional context

The first version that introduced the bug is 13.4.13-canary.0 since reverting to 13.4.12 works as expected

_NEXT-1663

[github-actions]

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