Blazor HttpClientHandler times out

Question

I'm not sure if this is the correct area to ask this question so if it's not please can you point me to the right place....

I've got a Blazor server app and it uses HttpClientHandler and IHttpClientFactory  to call the Data API. When my app is deployed on an on-premise IIS server, it stops working quite frequently. I have worked out this is because the http clients are being disposed - 'System.Net.Http.SocketsHttpHandler' "Cannot access a disposed object".

I think something is wrong with my coding pattern but after hours of reading, cannot quite pin-point why this is.

My code in the Program.cs file (start up) and data service is as follows:

Thanks in advance for any help!

//Program.cs file

//create handler
HttpClientHandler handler = new HttpClientHandler()
{
    UseDefaultCredentials = true,
    AllowAutoRedirect = false,
};


//create named http client
string uriPath = "https://...";

services.AddHttpClient("myHttpClient", client =>
{
    client.BaseAddress = new Uri(uriPath);
    client.DefaultRequestHeaders.Clear();
    client.DefaultRequestHeaders.Add(HeaderNames.Accept, "application/json");
})
    .ConfigurePrimaryHttpMessageHandler(() => handler);




//Data service code

//injection of IHttpClientService
private readonly IHttpClientService _httpClientService;

public SomeDataService(IHttpClientService clientService)
{
	_httpClientService = clientService;
}

//then within the data service method

//create http client 
var client = _httpClientService.GetHttpClientFactory("myHttpClient");
.... await client.GetStreamAsync($"api/....")...;

Answer 1

Hi @Sandra Anderson,

I found this link, and I think the answer does a good job of explaining why *'System.Net.Http.SocketsHttpHandler' "Cannot access a disposed object"* error occurs.

Could you change the code like below and tell us it works or not.

services.AddHttpClient("myHttpClient", client =>
{
    client.BaseAddress = new Uri(uriPath);
    client.DefaultRequestHeaders.Clear();
    client.DefaultRequestHeaders.Add(HeaderNames.Accept, "application/json");
})
.ConfigurePrimaryHttpMessageHandler(() =>
{
    return new HttpClientHandler()
    {
        UseDefaultCredentials = true,
        AllowAutoRedirect = false
    };
            
}); 

---

If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Best regards,

Jason Pan