Sadness with ember-cli-fastboot

[rwjblue]

Haven't had much time to dig into this yet, but I just spun up a new app with ember-cli@3.14.0-beta.1 and get an error when I add ember-cli-fastboot.

Steps to reproduce:

npx ember-cli@3.14.0-beta.1 new foo --yarn
cd foo
yarn add -D ember-cli-fastboot
ember serve --port 0

Then visit / in the app. I see:

Error: You must provide a hostWhitelist to retrieve the host
    at FastBootRequest.host (/Users/rjackson/src/rwjblue/test-disabling-loading-routes/node_modules/fastboot/src/fastboot-request.js:22:13)
    at Class._host (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/addon-tree-output/ember-cli-fastboot/services/fastboot.js:25:1)
    at Class.<anonymous> (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/addon-tree-output/ember-cli-fastboot/services/fastboot.js:30:1)
    at untrack (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/@ember/-internals/metal/index.js:3324:1)
    at untrack (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/@ember/-internals/metal/index.js:1247:1)
    at ComputedProperty.get (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/@ember/-internals/metal/index.js:3323:1)
    at Class.CPGETTER_FUNCTION [as host] (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/@ember/-internals/metal/index.js:1044:1)
    at getPossibleMandatoryProxyValue (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/@ember/-internals/metal/index.js:1269:1)
    at get (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/@ember/-internals/metal/index.js:1342:1)
    at Class.get (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/@ember/-internals/runtime/lib/mixins/observable.js:116:1)
    at Object.patchFetchForRelativeURLs [as initialize] (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/test-disabling-loading-routes/instance-initializers/setup-fetch.js:19:1)
    at _runInitializer (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/@ember/engine/index.js:156:1)
    at Vertices.each (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/dag-map.js:231:1)
    at Vertices.walk (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/dag-map.js:145:1)
    at DAG.each (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/dag-map.js:75:1)
    at DAG.topsort (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/dag-map.js:83:1)
    at Class._runInitializer (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/@ember/engine/index.js:171:1)
    at Class.runInstanceInitializers (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/@ember/engine/index.js:154:1)
    at Class._bootSync (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/@ember/application/instance.js:111:1)
    at _bootPromise._runtime.RSVP.Promise.resolve (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/@ember/engine/instance.js:85:1)
    at initializePromise (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/rsvp.js:520:1)
    at new Promise (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/rsvp.js:1021:1)
    at Class.boot (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/@ember/engine/instance.js:85:1)
    at buildAppInstance.then.appInstance (/Users/rjackson/src/rwjblue/test-disabling-loading-routes/node_modules/fastboot/src/ember-app.js:292:25)
    at invokeCallback (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/rsvp.js:493:1)
    at publish (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/rsvp.js:476:1)
    at _runloop.backburner.schedule (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/ember-testing/lib/ext/rsvp.js:19:1)
    at invokeWithOnError (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/backburner.js:347:1)
    at Queue.flush (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/backburner.js:229:1)
    at DeferredActionQueues.flush (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/backburner.js:426:1)
    at Backburner._end (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/backburner.js:960:1)
    at Backburner._boundAutorunEnd (/var/folders/mt/yt2qjpl93ls98lrkrs81rzch000pzv/T/broccoli-130653rRm3Dk7C9Vf/out-261-broccoli_merge_trees/assets/backburner.js:629:1)
    at process._tickCallback (internal/process/next_tick.js:68:7)

NOTE there is no actual attempt to use fetch at all in this setup.