C#•10mo ago

Setting BaseURI for named HttpClient in DI not including trailing string

I am trying to use a named HttpClient setup in a Blazor WASM application. In my DI setup, I create it using the following:

builder.Services.AddScoped<AuthorizationMessageHandler>();
builder.Services.AddHttpClient("apiClient",
        client => client.BaseAddress = new Uri("http://localhost:5199/api/v1/"))
    .AddHttpMessageHandler(sp =>
        sp.GetRequiredService<AuthorizationMessageHandler>().ConfigureHandler(new[] { "http://localhost:5199" }));

builder.Services.AddScoped<HttpClient>(sp => sp.GetRequiredService<IHttpClientFactory>()
    .CreateClient("apiClient"));

builder.Services.AddScoped<AuthorizationMessageHandler>();
builder.Services.AddHttpClient("apiClient",
        client => client.BaseAddress = new Uri("http://localhost:5199/api/v1/"))
    .AddHttpMessageHandler(sp =>
        sp.GetRequiredService<AuthorizationMessageHandler>().ConfigureHandler(new[] { "http://localhost:5199" }));

builder.Services.AddScoped<HttpClient>(sp => sp.GetRequiredService<IHttpClientFactory>()
    .CreateClient("apiClient"));

However, when the HttpClient is injected into a Razor page and used to query my API using this code:

ChorePageResultDTO res = await httpClient.GetFromJsonAsync<ChorePageResultDTO>($"/Chores?page={state.Page+1}?pageSize={state.PageSize}") ?? new ChorePageResultDTO();

ChorePageResultDTO res = await httpClient.GetFromJsonAsync<ChorePageResultDTO>($"/Chores?page={state.Page+1}?pageSize={state.PageSize}") ?? new ChorePageResultDTO();

it makes a request like so:

info: System.Net.Http.HttpClient.apiClient.LogicalHandler[100]
      Start processing HTTP request GET http://localhost:5199/Chores?page=1?pageSize=10
info: System.Net.Http.HttpClient.apiClient.ClientHandler[100]
      Sending HTTP request GET http://localhost:5199/Chores?page=1?pageSize=10

info: System.Net.Http.HttpClient.apiClient.LogicalHandler[100]
      Start processing HTTP request GET http://localhost:5199/Chores?page=1?pageSize=10
info: System.Net.Http.HttpClient.apiClient.ClientHandler[100]
      Sending HTTP request GET http://localhost:5199/Chores?page=1?pageSize=10

It seems to be dropping the "/api/v1/" portion of the base URI for the request but using the base host/port that I provided (the port running this web application is 5000, which I assume would be the HttpClient default if I hadn't provided a new BaseAddress in my configuration.) Why is it dropping this portion and how can I get it to stop?

1 Reply

P R Deltoid•10mo ago

Apparently, when using the HttpClient, my requestUri had a leading slash ("/Chores") and HttpClient was getting messed up trying to combine it with my BaseAddress for some reason. Removing the slash from my HttpClient's Get request fixes this issue. I was fixated on the configuration and didn't think that I may just be misusing the client. A bit confusing but all is well.

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Setting BaseURI for named HttpClient in DI not including trailing string