How to deploying Scala HTTP4S app to Heroku?

Question

I am trying to deploy a Scala HTTP4S app to Heroku.

sbt -sbt-version 1.3.12 new http4s/http4s.g8 -b 0.21

Used the above command to get the giter8 template from HTTP4S.

herokuAppName in Compile := "glacial-waters-76053"

enablePlugins(JavaAppPackaging)

Put the about lines into my build.sbt file.

addSbtPlugin("com.heroku" % "sbt-heroku" % "2.1.4")
addSbtPlugin("com.typesafe.sbt" % "sbt-native-packager" % "1.7.5")

Added the above to my plugins.sbt file

I then created a Procfile which has the below

web: target/universal/stage/bin/fsdeploy -Dhttp.port=${PORT}

I do NOT have anything in my application.conf file, I'm not sure how to specify a port for the above Procfile.

I have researched: https://devcenter.heroku.com/articles/deploying-scala along with a couple of Youtube videos. However all of the Youtube tutorials vary and none of which use HTTP4S.

Error I am currently getting when typing heroku logs -a glacial-waters-76053

2020-09-24T13:08:35.000000+00:00 app[api]: Build succeeded
2020-09-24T13:09:09.589928+00:00 heroku[web.1]: Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch
2020-09-24T13:09:09.618010+00:00 heroku[web.1]: Stopping process with SIGKILL
2020-09-24T13:09:09.723909+00:00 heroku[web.1]: Process exited with status 137
2020-09-24T13:09:09.764290+00:00 heroku[web.1]: State changed from starting to crashed
2020-09-24T13:09:09.766587+00:00 heroku[web.1]: State changed from crashed to starting
2020-09-24T13:09:13.794185+00:00 heroku[web.1]: Starting process with command `target/universal/stage/bin/fsdeploy -Dhttp.port=${8080}`
2020-09-24T13:09:16.042457+00:00 app[web.1]: Setting JAVA_TOOL_OPTIONS defaults based on dyno size. Custom settings will override them.
2020-09-24T13:09:16.150395+00:00 app[web.1]: Picked up JAVA_TOOL_OPTIONS: -Xmx300m -Xss512k -XX:CICompilerCount=2 -Dfile.encoding=UTF-8
2020-09-24T13:09:18.212577+00:00 app[web.1]: [ioapp-compute-0] INFO  o.h.b.c.n.NIO1SocketServerGroup - Service bound to address /0:0:0:0:0:0:0:0:8080
2020-09-24T13:09:18.221367+00:00 app[web.1]: [ioapp-compute-0] INFO  o.h.s.b.BlazeServerBuilder -
2020-09-24T13:09:18.221370+00:00 app[web.1]: _   _   _        _ _
2020-09-24T13:09:18.221370+00:00 app[web.1]: | |_| |_| |_ _ __| | | ___
2020-09-24T13:09:18.221370+00:00 app[web.1]: | ' \  _|  _| '_ \_  _(_-<
2020-09-24T13:09:18.221371+00:00 app[web.1]: |_||_\__|\__| .__/ |_|/__/
2020-09-24T13:09:18.221371+00:00 app[web.1]: |_|
2020-09-24T13:09:18.341159+00:00 app[web.1]: [ioapp-compute-0] INFO  o.h.s.b.BlazeServerBuilder - http4s v0.21.5 on blaze v0.14.12 started at http://[::]:8080/
2020-09-24T13:10:14.543831+00:00 heroku[web.1]: Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch
2020-09-24T13:10:14.565588+00:00 heroku[web.1]: Stopping process with SIGKILL
2020-09-24T13:10:14.691564+00:00 heroku[web.1]: Process exited with status 137
2020-09-24T13:10:14.729362+00:00 heroku[web.1]: State changed from starting to crashed
2020-09-24T13:10:16.891638+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/joke" host=glacial-waters-76053.herokuapp.com request_id=1dfa6a6e-2e75-40a1-89cd-97b092a0fbe1 fwd="109.152.82.26" dyno= connect= service= status=503 bytes= protocol=https
2020-09-24T13:10:17.492951+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=glacial-waters-76053.herokuapp.com request_id=9a8f9622-e93b-4517-b5c3-fe80f426a6d7 fwd="109.152.82.26" dyno= connect= service= status=503 bytes= protocol=https

Postman is return a 503 service unavailable error.

Here is a link to the repo: https://github.com/fullStackRyan/fsdeploy

Answer 1

Your app will try to listen on port 8080.

You can replace the port on line 33 of your YourServerNameServer.scala from 8080 to sys.env("PORT").toInt