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Currently, this is possible if functions are deployed through the App Platform. If this is not the case for you, what you could do is spin up a Droplet with HAProxy or a Load balancer and setup the reverse proxy for your custom domain to the serverless function.
As a side note, this is something that has been on our radar, the best thing to do to get your voice heard regarding this would be to head over to our Product Ideas board and post a new idea, including as much information as possible for what you’d like to see implemented.
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