JSON mime type

[madzodiac]

Specifications

• Image hash or version: latest
• Platform: armv7
• Subsystem:

Expected Behavior

The webserver should deliver deliver json files with the json mime type and not as plain text

Actual Behavior

webserver delivers json files as plain text and nit as json mime type.

This results in that dump1090exporter cannot utilize the produced json files and results in the problem described here.

Steps to Reproduce the Problem

1. Call a .json file under http://:8080/data/ e.g. aircraft.json
2. File is delivered as plain text, not json

[MaxWinterstein]

Had a quick look at this, I guess we can't solve this here.
At least I did not find any solution to add header modification to thethttp.

There was an attemp to change the webserver to httpd(known as Apache) but it was dismissed by the maintainer.
See #114

I created a PR at the main repo that should fix this at the root, but I have no idea if and when they release.
claws/dump1090-exporter#42