C#•2y ago

Middleware to modify url

I'm trying to modify my HttpClient so it modifies a url before sending. I think I see how to do it but I just want to check as I've never done this. Also, what is a primary message handler? How is primary different than any other message handler?

                services.AddHttpClient("cocApi", config =>
                {
                    config.BaseAddress = new Uri(hostBuilder.Configuration["Settings:BaseAddress"]);
                })
                .ConfigurePrimaryHttpMessageHandler(sp => new SocketsHttpHandler()
                {
                    MaxConnectionsPerServer = 10
                })
                .AddHttpMessageHandler((services) => new Foo());
            });
}

public class Foo : DelegatingHandler
{
    protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        Console.WriteLine("hi"); // this fires so i guess i got it right
        return base.SendAsync(request, cancellationToken);
    }
}

                services.AddHttpClient("cocApi", config =>
                {
                    config.BaseAddress = new Uri(hostBuilder.Configuration["Settings:BaseAddress"]);
                })
                .ConfigurePrimaryHttpMessageHandler(sp => new SocketsHttpHandler()
                {
                    MaxConnectionsPerServer = 10
                })
                .AddHttpMessageHandler((services) => new Foo());
            });
}

public class Foo : DelegatingHandler
{
    protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        Console.WriteLine("hi"); // this fires so i guess i got it right
        return base.SendAsync(request, cancellationToken);
    }
}

9 Replies

Cisien•2y ago

the primary message handler is something like HttpClientHandler or SocketHttpHandler

devhl•2y ago

What makes it "primary"

Cisien•2y ago

it's the thing that does the work

devhl•2y ago

lol okay

Cisien•2y ago

delegating handlers let you inject something in between

devhl•2y ago

Oh perfect

Cisien•2y ago

so, in your case, changing the url, doing logging, perf counters, etc.

devhl•2y ago

Then I'm in the right place then. Thanks for the help!

Cisien•2y ago

yep

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Middleware to modify url