[BUG?] FusionExceptionView drops all header information from rendered output

[Sebobo]

In

neos-development-collection/Neos.Neos/Classes/View/FusionExceptionView.php

Line 184 in 683b692

protected function extractBodyFromOutput(string $output): string

all rendered header data from the rendered Fusion output is dropped. Therefore custom headers like Content-Type or others don't have any effect.

In my case I wanted to respond with JSON responses für 404 requests in a Fusion based API.
But the Content-Type was text/html instead of my configured application/json type.

My workaround was now to check the output for json content in the custom ExceptionHandler we use in the affected project and adjust the header manually.

Neos: 8.3
Flow: 8.3

[mhsdesign]

As im currently on this topic for Neos 9 we can fix it see also

neos/flow-development-collection#3286 (comment)

The question would be

Yeah we can add the headers but which status code should we use? The one inferred from the FlowException / 500 or the one from the view?

Maybe: use from the view if it’s NOT 200 and else fallback to the current logic?

wdyt?