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Is there an existing issue for this?
Describe the bugThis is duplicate of issue reported in eShop, but it needs more love, so adding it here. It is on Mac, but I think it is irrelevant. Calling Console.WriteLine($"IP {apiService.GetEndpoint("http").Url}");crashes with: Expected BehaviorShould handle Exception at least. Steps To ReproduceCleanup rm -fr AppAspireRepro/Create minimal sample dotnet new aspire-starter -o AppAspireReproRun: dotnet run --project AppAspireRepro/AppAspireRepro.AppHost/AppAspireRepro.AppHost.csprojNow add: Console.WriteLine($"IP {apiService.GetEndpoint("http").Url}");
Console.WriteLine($"IP {apiService.GetEndpoint("https").Url}");before: builder.Build().Run();Run again dotnet run --project AppAspireRepro/AppAspireRepro.AppHost/AppAspireRepro.AppHost.csprojand watch Der Untergang: Exceptions (if any).NET Version infoAnything else?
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Answered by
davidfowl
Apr 27, 2025
Replies: 5 comments 2 replies
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It seems you try get Endpoint url before host started, endpoint allocated when host completly started. |
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Thanks for help.
Not sure about that. OK. I am not Aspire expert, but I remember I tried a lot of variants. Have you tried to repro? It is quite simple. OK. Trying. Changed var a = builder.Build();
Console.WriteLine($"IP {apiService.GetEndpoint("http").Url}");
Console.WriteLine($"IP {apiService.GetEndpoint("https").Url}");
a.Run();The same result. I think placing code after There are several comments in eShop repo (issue I linked) |
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Endpoint allocated after |
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Confirmed (tested): Code: var a = builder.Build();
a.Run();
Console.WriteLine($"IP {apiService.GetEndpoint("http").Url}");
Console.WriteLine($"IP {apiService.GetEndpoint("https").Url}");Does not throw, but cannot be used. Nope. Info about IP address is needed eariler. |
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1 reply
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If you just want to reuse the port/url for further configuration you could use CallbackOverrides of the Aspire Methods. Not sure if this helps. The callback urls are then called in the order where the data is already set. Example setting port envvar within builder: var builder = DistributedApplication.CreateBuilder(args); builder.AddNpmApp("appb", "../app-b") |
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The eshop bug is for a different reason. It's because when you run on the command line, the http launch profile is selected and there's no https endpoint defined. The above is because you are resolving it too early. If you want to print the endpoint then you can resolve it after Starting: var builder = DistributedApplication.CreateBuilder(args);
var appA = builder.AddNpmApp("app-a", "../app-a")
.WithHttpEndpoint(env: "PORT")
.WithExternalHttpEndpoints()
.PublishAsDockerFile();
var httpEndpoint = appA.GetEndpoint("http");
var app = builder.Build();
app.Start();
Console.WriteLine($"URL: {httpEndpoint.Url}");
app.WaitForShutdown(); |
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See https://gist.github.com/davidfowl/b408af870d4b5b54a28bf18bffa127e1#endpoint-primitives |
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Answer selected by
davidfowl
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See https://gist.github.com/davidfowl/b408af870d4b5b54a28bf18bffa127e1#endpoint-primitives