Support Vercel

[armanbilge]

Documentation: https://vercel.com/docs/functions/serverless-functions/runtimes/node-js#advanced-node.js-usage

Vercel expects you to export a function whose signature is compatible with the argument to Node.js createServer method.

Fortunately there is already an implementation of such a function in http4s.

https://github.com/http4s/http4s/blob/ec939b1b354843d53293d4f9a9ac0e205fd4ec47/client-testkit/js/src/main/scala/org/http4s/client/testkit/scaffold/ServerScaffold.scala#L70-L72

[Chingles2404]

Hi! I will be working on this :D

[armanbilge]

Ching has been working on this in #492. Unfortunately it turns out that Vercel is not very flexible i.e. it lacks support for dynamic routing which is required to support http4s HttpApp, see #492 (comment) for additional details. So I think until Vercel supports that (or we can find some clever workaround) we will have to keep this integration on ice 😕