Typed HTTP client in Azure function not registering properly

Question

I'm trying to create a typed http client in an Azure function through DI, when I set it like below, it is not getting into the lambda and therefore is not setting the BaseAddress.

        builder.Services.AddSingleton<IService, Service>();
        builder.Services.AddHttpClient<IService, Service>(client => {
            client.BaseAddress = new Uri("http://www.google.com");
        });

In the service that will create the methods for the client, it consumes like so:

  public Service(HttpClient client){

Then in other classes I'm injecting in Startup as:

  public AClass(Service service){

I'm following the official doc, what could be wrong?

Nkosi · Accepted Answer · 2021-02-12 03:16:46Z

5

This code snippet

builder.Services.AddHttpClient<IService, Service>(client => {
    client.BaseAddress = new Uri("http://www.google.com");
});

will already add the service to the collection. I would suggest removing the singleton

builder.Services.AddSingleton<IService, Service>();

Lastly, the service was registered with an abstraction, yet you try to inject the implementation.

public AClass(Service service){

I would suggest injecting the abstraction instead where needed

public AClass(IService service){ //<-- NOTE THE INTERFACE

answered Feb 12, 2021 at 3:16

Nkosi

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2 Comments

user33276346 Over a year ago

Indeed the problem was solved by removing the manual singleton. Thanks!

Andrew B Aug 7 at 8:27

Thanks so much for this! I can't see any mention of this behaviour in the docs. It'd be nice if an Exception got thrown upon adding twice.

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