Google App Engine Custom Domain - Routing in Go - google-app-engine

Question

I've been utilizing the url provided to me by the google-app-engine, i.e. "projectname-id.appspot.com" for my project. I had previously purchased a custom domain from GoDaddy, and I followed the steps at the following link to verify ownership of the domain name within the Google Cloud Platform, add the domain to my Google App Engine Project, and update my DNS settings in GoDaddy to point to the listed CNAME/server combination. https://cloud.google.com/appengine/docs/go/console/using-custom-domains-and-ssl
When I visit my custom domain, a website page is served, but it's always a 404. The "projectname-id.appspot.com" url still works correctly, and when I look at the log statements in the Google App Engine, it receives the request from both my custom domain and the appspot domain - which seems to suggest the domain dns was updated properly. See image below, where the 404 is from the custom domain and the 200 is from the appspot url:
Google App Engine Logs
Is there anything else I have to do? The backend is written in Go, and we're using the Mux Router. Do I need to modifiy my app.yaml file or edit my routes somehow? Any suggestions would be greatly appreciated.
Here I've included some code snippets I use to initialize my server:
App.yaml
version: alpha-001
runtime: go
api_version: go1
handlers:
- url: /.*
script: _go_app
env_variables:
PRODUCTION: 'TRUE'
DATASTORE_DATASET: 'app-id'
DATASTORE_HOST: 'http://localhost:8043'
DATASTORE_EMULATOR_HOST: 'localhost:8043'
DATASTORE_PROJECT_ID: 'app-id'
GOOGLE_APPLICATION_CREDENTIALS: './app-string.json'
Initializing the WebConsole (Server):
func init() {
// Web Server for API Endpoints
flag.Parse()
var server *web_console.WebConsole
if prod := os.Getenv("PRODUCTION"); prod == "FALSE" {
server = web_console.NewWebConsole(false)
} else {
server = web_console.NewWebConsole(true)
}
server.Run()
}
WebConsole.go
type WebConsole struct {
prod bool
Mux *mux.Router
DbMap *gorp.DbMap
Client *datastore.Client
}
func NewWebConsole(prod bool) *WebConsole {
return &WebConsole{
prod: prod,
}
}
func (w *WebConsole) Run() {
w.dbInit()
w.routesInit()
}
func (w *WebConsole) dbInit() {
// Configure SQL connection
// Code removed for privacy reasons
}
func (w *WebConsole) routesInit() {
// Configure routes with Mux
w.Mux = mux.NewRouter()
api.AddCertChallengeApis(w.Mux)
// The path "/" matches everything not matched by some other path.
// Checkout: http://stackoverflow.com/questions/26581231/google-cloud-go-handler-without-router-gorilla-mux
// for more details
http.Handle("/", w.Mux)
}
Api Package File for Routing
package api
import (
"github.com/gorilla/mux"
"google.golang.org/appengine"
"google.golang.org/appengine/log"
"net/http"
"strings"
)
func AddCertChallengeApis(r *mux.Router) {
r.Schemes("http")
r.HandleFunc("/", defaultHandler())
}
func defaultHandler() http.HandlerFunc {
return func(rw http.ResponseWriter, req *http.Request) {
// Construct new app engine context
c := appengine.NewContext(req)
log.Infof(c, "App ID: %v", appengine.AppID(c))
rw.Header().Set("Content-Type", "text/plain")
rw.Write([]byte("hi, welcome to my website yo"))
log.Infof(c, "Hit the website")
}
}

Answer 1

I have done custom domains on appengine/go before, and there is nothing else you should have to do. I would try removing this line, though,
r.Schemes("http")
in case it is something https related.