Aspire. Every project launched from App Host opens up in browser

Problem

Launching the App Host run configuration causes every child project launched from App Host to open up in browser. Sample AppHost/Program.cs:

var builder = DistributedApplication.CreateBuilder(args);

var apiService = builder.AddProject<Projects.MyApiService>("apiservice");

builder.AddProject<Projects.MyFrontend>("webfrontend")
    .WithExternalHttpEndpoints()
    .WithReference(apiService)
    .WaitFor(apiService);

builder.Build().Run();

Cause

This behavior is controlled either by IDE settings nor by ExactProject/Properties/launchSettings.json:"launchBrowser": true/false

Resolution

There are two available approaches to come to the desired behavior:

1. Edit per-project {ExactProject}/Properties/launchSettings.json:"launchBrowser": true/false . This approach allows flexibly setting up which projects Rider should open on App Host run configuration runs.

   Sample. Consider there are the following projects:

   1. AppHost; It's Program.cs adds two below projects (code snippet is provided above).
   2. MyApiService; It's Properties/launchSettings.json has "launchBrowser": false.
   3. MyFrontend; It's Properties/launchSettings.json has "launchBrowser": true.

   Having such a configuration, when the App Host http/https run configuration runs, only the AppHost and MyFrontend will open in browser on AppHost run configuration start. A page for MyApiService will not open in a browser. The disadvantage of that approach is that editing SampleProject/Properties/launchSettings.json affects the scenario of running the SampleProject project outside App Host. If it has "launchBrowser": false , the app will not open in browser on its start.

2. Enable the "Settings | Tools | Aspire | Do not launch the browser for child projects" setting. As it says, when this setting is enabled, child projects launched from App Host will not open up in a browser on App Host launch. Having it turned on, the {ChildProject}/Properties/launchSettings.json:"launchBrowser": true is ignored.

It that doesn't help, do not hesitate to report an issue.