Deleting Headers Causing Immutable TypeErrors

[hassanbazzi]

edge-runtime/packages/runtime/src/edge-runtime.ts

Line 155 in 803cc4f

response.headers.delete('content-encoding');

Hey! Working on writing some middleware functions and I suddenly started getting TypeError: Immutable

After some detective work, I found out it's because of the above 3 lines that try to delete these 3 headers when doing a redirection. When I delete these 3 lines locally, everything works as expected. Any idea what these 3 do or why this is happening?

I also understand this hasn't been changed in quite some time, and so it might be something else that's causing this to happen under the hood, I just don't understand it enough and some guidance would be amazing.

I'm on vercel cli 28.4.8.

[Kikobeats]

Thanks for reporting @hassanbazzi

It's fixed in the Vercel CLI vercel@28.4.10.

If you install the latest Vercel CLI version, you shouldn't experience in the issue anymore 🙂