content-encoding: gzip w/ SvelteKit app POST

1

Hi guys,
I recently deployed a SvelteKit app with adapter-node and noticed my HTTP headers being rewritten. For application/json, Content-Encoding is set to gzip which causes failures in my frontend evaluating the response on POST requests to the node server.

headers: Headers(7) { "content-encoding" → "gzip", "content-type" → "application/json;charset=UTF-8", date → "Mon, 11 Mar 2024 11:58:45 GMT", … }
​​
​​"content-encoding": "gzip"
​​​"content-type": "application/json;charset=UTF-8"
​​​date: "Mon, 11 Mar 2024 11:58:45 GMT"
​​​"fly-request-id": "01HRPP29M77RCRWN0R71800NZD-ams"
​​​server: "Fly/0637d260 (2024-03-07)"
​​​via: "1.1 fly.io, 2 fly.io"
​​​"x-firefox-spdy": "h2"

I usually do something like response.json() everywhere in my app resulting in TypeError: Decoding failed.

I conclude from a similar discussion that the proxy sets those header values: Content-Encoding: gzip

Is there anything I can do via the config? Disabling compression (like explained here: Machines · Fly Docs) with

[http_service.http_options.response]
  compress = false

did nothing. Overriding the header value like

[http_service.http_options.response.headers]
  Content-Encoding = false

results in the frontend not being rendered at all.

I cannot reproduce the issue in my local test environment without manually overriding the header. I also build and test Docker images for production locally before deploying to fly and the issue never occurred there. Is there anything I can do without changing my code?

EDIT: It works perfectly fine for GET requests.

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