The "serverless-domain-manager" basePath fails for custom domains

Serverless Framework
1

I’ve started by making the basePath ‘’ (none). A simple curl to custom domain endpoint would return a response. For example

const serverless = require("serverless-http");
const express = require("express");
const app = express();

app.get("/", (req, res, next) => {
  return res.status(200).json({
    message: "Hello from root!",
  });
});

app.get("/hello", (req, res, next) => {
  return res.status(200).json({
    message: "Hello world",
  });
});

app.get("/test", (req, res, next) => {
  return res.status(200).json({
    message: "Test 1",
  });
});

app.use((req, res, next) => {
  return res.status(404).json({
    error: "Not Found",
  });
});

exports.handler = serverless(app);

> curl https://lambda.foobar.com/hello
Hello world

I then modify the serverless.yml, and make the basePath: v1, sls deploy it. When complete I run the curl command which returns:

> curl https://lambda.foobar.com/v1/hello
{"error":"Not Found"}%

Here’s the serverless.yml

org: xxxxx
app: test-aws-node-express-api
service: nodejs-test

provider:
  name: aws
  runtime: nodejs20.x
  region: eu-west-2
  stage: prod

functions:
  api:
    handler: handler.handler
    events:
      - http:
          path: /
          method: get
      - http:
          path: hello
          method: get
      - http:
          path: test
          method: get

plugins:
  - serverless-domain-manager

custom:
  customDomain:
    domainName: lambda.foobar.com
    certificateArn: arn:aws:acm:eu-west-2:yyyyyyyy:certificate/xxxxxxxx
    basePath: v1
    stage: ${self:provider.stage}
    createRoute53Record: false
    endpointType: regional
    securityPolicy: tls_1_2

Also, tested delete_domain and create_domain but issue persists.

2

My bad! The basePath has to be defined in the application side. If not, it’d fail!

const serverless = require("serverless-http");
const express = require("express");
const app = express();

const v1Router = express.Router();

v1Router.get("/test", (req, res, next) => {
    return res.status(200).json({
        message: "Hello from v1!"
    });
});

app.use("/v1", v1Router);

app.get("/", (req, res, next) => {
  return res.status(200).json({
    message: "Hello from root!",
  });
});

app.get("/hello", (req, res, next) => {
  return res.status(200).json({
    message: "Hello world",
  });
});

app.get("/test", (req, res, next) => {
  return res.status(200).json({
    message: "Test 1",
  });
});

app.get("/foobar", (req, res, next) => {
  return res.status(200).json({
    message: "Foobar",
  });
});

app.use((req, res, next) => {
  return res.status(404).json({
    error: "Not Found",
  });
});

exports.handler = serverless(app);

❯ curl https://lambda.foobar.io/v1/test
{"message":"Hello from v1!"}%