What version of astro are you using?

2.10.3

Are you using an SSR adapter? If so, which one?

Node

What package manager are you using?

npm

What operating system are you using?

Mac

What browser are you using?

Chrome, Firefox, Safari

Describe the Bug

Have a page which returns 500 response.
Here is how behaviors differ:

• in dev mode it will show body of the 500 response.
• in build mode it will display actual custom 500 page, but its content-type header will be text/plain;charset=UTF-8

What's the expected result?

Behavior of 500 response is consistent between modes, and content-type is returned correcly.

Link to Minimal Reproducible Example

https://stackblitz.com/edit/github-pt4enm-mla9j5

Participation

• I am willing to submit a pull request for this issue.