This document describes how to run PWA and ICM using the Hybrid Approach, so that pages from the Intershop Progressive Web App and pages from the classic storefront (Responsive Starter Store) can be run in parallel.

A possible scenario would be to have the shopping experience with all its SEO optimizations handled by the PWA and to delegate highly customized parts of the checkout or My Account area to the ICM.

Requirements

The best way to deploy a Hybrid Approach installation with a shared domain is using the PWA Helm chart (0.4.0 and above with ICM 11) provided by Intershop.
For information on configuration of the PWA Helm chart for PWA and ICM, refer to the according Hybrid Approach paragraph.

The minimum version requirements for the involved systems are the following:

• PWA 3.2.0
• ICM 7.10.38.6-LTS

However, to deployed both together with a combined Helm chart ICM 11 is required.

The secure access required for the PWA/NGINX deployments in production-like environments is handled by the Ingress controller, so the PWA and the NGINX container itself can be deployed without SSL.
ICM only needs to be deployed with secure access anyway.

Architectural Concept

For a minimally invasive implementation, the mechanics for the Hybrid Approach are mainly implemented outside of ICM and in deployment-specific components of the PWA.

The ICM is proxied in the express.js server of the server-side rendering (SSR) process and hereby made available to the outside.
A newly introduced mapping table is used in the SSR to decide whether an incoming request should be handled by the PWA or the ICM.
This mapping table is also used in the browser-side PWA to switch from the single-page application context to the ICM.

Configuration

Intershop Commerce Management (ICM)

The ICM must be run with Secure URL-only Server Configuration, which can be done by adding SecureAccessOnly=true to the appserver configuration.

Furthermore, the synchronization of the apiToken cookie must be switched on, so that users and baskets are synchronized between PWA and ICM.
See Concept - Integration of Progressive Web App and inSPIRED Storefront.

If you also want to support the correct handling for links generated in e-mails, the property intershop.WebServerSecureURL must point to NGINX.

configuration via $SERVER/share/system/config/cluster/appserver.properties:

SecureAccessOnly=true
intershop.apitoken.cookie.enabled=true
intershop.apitoken.cookie.sslmode=true
intershop.WebServerSecureURL=https://<NGINX>

configuration via icm_as Helm chart:

INTERSHOP_APITOKEN_COOKIE_ENABLED: true
INTERSHOP_APITOKEN_COOKIE_SSLMODE: true
INTERSHOP_WEBSERVERSECUREURL: https://<icm-web>

Intershop Progressive Web App (PWA)

The server-side rendering process must be started with SSR_HYBRID=1.

Also, the Service Worker must be disabled for the PWA, as it installs itself in the browser of the client device and takes over the routing process, making it impossible to break out of the PWA and delegate to the ICM.
The Service Worker is disabled by default.

Mapping Table

The mapping table resides in the PWA source code and provides the page-specific mapping configuration for the Hybrid Approach.

  {
    id: "Product Detail Page",
    icm: `${ICM_CONFIG_MATCH}/ViewProduct-Start.*(\\?|&)SKU=(?<sku>[\\w-]+).*$`,
    pwaBuild: `product/$<sku>${PWA_CONFIG_BUILD}`,
    pwa: `^.*/product/([\\w-]+).*$`,
    icmBuild: `ViewProduct-Start?SKU=$1`,
    handledBy: "icm"
  }

Each entry contains:

• A regular expression to detect a specific incoming URL as ICM or PWA URL (icm and pwa)
• Corresponding instructions to build the matching URL of the counterpart (pwaBuild and icmBuild)
• A property handledBy (either icm or pwa) to decide on the target upstream

The properties icm and pwaBuild can use named capture groups.
They are only used in the node.js process running on the server.
However, pwa and icmBuild are used in the client application where named capture groups are not yet supported by all browsers.

PWA Adaptions

With version 0.23.0 the PWA has been changed to no longer reuse the Responsive Starter Store application types, but rather to be based on the newly introduced headless application type for REST clients - intershop.REST.
This application type is completely independent of the Responsive Starter Store.
For this reason, the PWA must be configured to know which application to use to work with the Responsive Starter Store again (hybridApplication).

Preparing the PWA for the Hybrid Approach with the Responsive Starter Store

• Use a recent PWA version
• Configure icmApplication setting to denote the intershop.REST-based application used by the PWA (usually rest in the inSPIRED demo scenario).
• Configure hybridApplication setting to denote the Responsive Starter Store application (usually - in the inSPIRED demo scenario).
• Follow the Hybrid configuration setup

Development Environment

This section describes how to develop and test a PWA using the Hybrid Approach in a local development environment.

This development environment includes a local installation of ICM with the Responsive Starter Store, the PWA, and the NGINX.
In addition, it meets the requirements for a common domain and for https access.

After successful configuration and deployment, you can access the different systems with these URLs:

Configuration of a Common Domain

For a more realistic Hybrid Approach environment, it is not a good idea to use localhost as the common domain or 127.0.0.1 as the IP address.
For this reason, a different common domain - hybrid.local for this guide - must be configured in the operating system's etc/hosts file, pointing to the real IP address of the computer.

192.168.178.77 hybrid.local

The different parts of the server will then listen on different ports.
For this guide ICM will listen on port 7443 and the PWA SSR process will listen on port 7200 while the NGINX will respond on the default HTTPS port 443.

ICM

The ICM needs to be set up like a regular ICM development environment.

Special configuration for the ports should be done in the environment.properties (only the webserverHttpsPort is really relevant for our SecureAccessOnly deployment):

webserverPort = 7080
webserverHttpsPort = 7443

The server/share/system/config/cluster/appserver.properties needs to contain:

intershop.WebServerURL=http://hybrid.local
intershop.WebServerSecureURL=https://hybrid.local

intershop.apitoken.cookie.enabled=true
intershop.apitoken.cookie.sslmode=true

SecureAccessOnly=true

• ICM must point to NGINX, in this case https://hybrid.local
• The synchronization of the apiToken cookie must be enabled
• ICM must run in secure-only mode

PWA

The configurations relevant to the Hybrid Approach for running the PWA are:

• ICM_BASE_URL points to ICM https port - https://hybrid.local:7443
• For development scenarios with a self-signed certificate for ICM, this means that you have to set TRUST_ICM=true
• To enable the Hybrid Approach functionality in the SSR process, SSR_HYBRID=true must be set
• LOGGING=true helps with analysis and debugging
• Setting the port of the SSR process to 7200

A local PWA built from the current PWA project sources can be run in a number of ways:

Via Docker

docker build -t dev_pwa . && docker run -it -p 7200:7200 -e ICM_BASE_URL=https://hybrid.local:7443 -e TRUST_ICM=true -e SSR_HYBRID=true -e LOGGING=true -e PORT=7200 --name hybrid-pwa dev_pwa

Via bash

ICM_BASE_URL=https://hybrid.local:7443 TRUST_ICM=true SSR_HYBRID=true LOGGING=true PORT=7200 npm run start

Via bash with SSR development server with auto compile

ICM_BASE_URL=https://hybrid.local:7443 TRUST_ICM=true SSR_HYBRID=true LOGGING=true npm run start:ssr-dev -- --port 7200

ICM_BASE_URL=https://hybrid.local:7443 TRUST_ICM=true SSR_HYBRID=true LOGGING=true npm run start:ssr-dev -- --port 7200 --ssl

NGINX

The configurations relevant to the Hybrid Approach for running the NGINX are:

• UPSTREAM_PWA points to the PWA SSR process - http://hybrid.local:7200
• For secure access, set SSL=true (available since PWA 3.1.0)
• To avoid unexpected caching side effects, set CACHE=false
• Set NGINX to respond to the default https port 443

To start the NGINX container from the project sources with Docker:

docker build -t dev_nginx nginx && docker run -it -p 443:443 -e UPSTREAM_PWA=http://hybrid.local:7200 -e SSL=true -e CACHE=false --name hybrid-nginx dev_nginx

docker build -t dev_nginx nginx && docker run -it -p 443:443 -e UPSTREAM_PWA=https://hybrid.local:7200 -e CACHE=false -v <full-path-to>/server.crt:/etc/nginx/server.crt -v <full-path-to>/server.key:/etc/nginx/server.key --name hybrid-nginx dev_nginx

Docker Compose for PWA/NGINX

Alternatively, the PWA and NGINX can also be started with docker compose.

version: '3'
services:
  pwa:

    build:
      context: .
    environment:
      ICM_BASE_URL: https://hybrid.local:7443
      SSR_HYBRID: 'true'
      TRUST_ICM: 'true'
      LOGGING: 'true'
      PORT: 7200
    ports:
      - '7200:7200'

  nginx:

    build: nginx
    depends_on:
      - pwa
    ports:
      - '443:443'
    environment:
      UPSTREAM_PWA: 'http://pwa:7200'
      SSL: 1

Further References

• Guide - Building and Running Server-Side Rendering
• Guide - Handle rewritten ICM URLs in the Hybrid Approach
• Concept - Multi-site handling