docker: Angular client fails to call web service on docker

 >PROBLEM

You've have an Angular project that uses a web services, for instance Java Spring Boot, that works on the environment that is was created, but when the projects (the client and the WS) are migrated to Docker containers, they fail to communicate.

>SOLUTION

If the usual call using localhost fails, replace it with “host.docker.internal”.

  // usual, outside docker

  //private serverUrl = 'http://localhost:8081'

  // docker, if it fails localhost

  private serverUrl = 'http://host.docker.internal:8080'

Detailed procedure here:

Docker: Step-by-Step For An Angular Project Using Spring Boot Web Service [ML33743]

>ENV

Windows 10
Docker
Angular 7..13
Node.js 12..16