Error 502 only during POST requests

Hello all, I'm hosting websites on a local PC and exposing them through cloudflare tunnels. The website is now up working, however when a POST request is made to the server it returns with a 502 error.

I have enabled the Connector diagnostics within one.dash.cloudflare.com and watched the trail resulting in Unable to reach the origin service using http://localhost:3004.

In the tunnel public hostname page I am routing to http :// localhost:3004 to the correct domain with no subdomain or path added.

From the browser the HTTP Request as stated results in a 502 Bad gateway Error code 502 error page from cloudflare.

I've spent a day looking through other issues on here, google, stack overflow, and the community.cloudflare pages.

Any help is greatly appreciated and thanks for your time!

The details on the website: Sveltekit with node adapter, Dockerized and deployed through a program called Coolify.

I have another website deployed this same way with POST requests with no issue.
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