app.mjs

import { handle as spinFileserverHandle } from "wasi:http/incoming-handler@0.2.0"
import { OutgoingResponse, ResponseOutparam, OutgoingBody, Fields } from "wasi:http/types@0.2.0"

const encoder = new TextEncoder()
const disposeSymbol = Symbol.dispose || Symbol.for('dispose')

function handle(request, responseOut) {
    const method = request.method()
    const path = request.pathWithQuery()

    if (method.tag === "get") {
        if (path === "/hello") {
            const fields = new Fields()
            fields.append("content-type", encoder.encode("text/plain"))
            const response = new OutgoingResponse(fields)

            const responseBody = response.write()
            ResponseOutparam.set(responseOut, { tag: "ok", val: response })

            const responseStream = responseBody.write()
            responseStream.blockingWriteAndFlush(encoder.encode("Hello, world!"))
            responseStream[disposeSymbol]()
            OutgoingBody.finish(responseBody)
        } else {
            spinFileserverHandle(request, responseOut)
        }
    } else {
        const response = new OutgoingResponse(new Fields([]))
        response.setSatusCode(400)
        ResponseOutparam.set(responseOut, { tag: "ok", val: response })
        OutgoingBody.finish(response.write())
    }
}

export const incomingHandler = { handle }