Edge API endpoints can't read the body in next start and next dev

[Schniz]

Verify canary release

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

Provide environment information

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 21.4.0: Fri Mar 18 00:46:32 PDT 2022; root:xnu-8020.101.4~15/RELEASE_ARM64_T6000
Binaries:
  Node: 16.13.1
  npm: 8.1.2
  Yarn: 1.22.18
  pnpm: 7.3.0
Relevant packages:
  next: 12.1.7-canary.41
  react: 18.2.0
  react-dom: 18.2.0

What browser are you using? (if relevant)

How are you deploying your application? (if relevant)

Describe the Bug

With the runtime set to edge, it seems the request body is always empty (e.g. POST requests), or am I missing something?

Originally posted by @zaiste in #37481 (comment)

Expected Behavior

await request.text() if a POST request with a body occurred

Link to reproduction

To Reproduce

Create a new /api/edge.js file with the content:

export default async (req) => new Response(`got: ${await req.text()}`)
export const config = { runtime: 'experimental-edge' }

• run next dev --port=1234
• run curl http://localhost:1234/api/edge -X POST -d 'hello world'

This will fail.

[github-actions]

This closed issue has been automatically locked because it had no new activity for a month. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.