.Net Core HttpClientFactory 配置 HttpClientHandler

Question

I am currently configuring my httpclientfactory this way

HttpClientHandler httpClientHandler = new HttpClientHandler()
{
    ServerCertificateCustomValidationCallback = (message, cert, chain, errors) => { return true; }

};

serviceCollection.AddHttpClient("ignoreSSL", c =>
{}).ConfigurePrimaryHttpMessageHandler(h => httpClientHandler);

To disable the validation of security certificates, but when doing too many requests I receive this exception:

Cannot access a disposed object. Object name: 'SocketsHttpHandler'.

I currently build my httpclient this way

HttpClient client = _httpClientFactory.CreateClient("ignoreSSL");

Doing tests, this is solved in this way without httpclientfactory

HttpClient ad = new HttpClient(handler, false);

For more than I look for I can not find how to tell httpclientfactory not to make handler dispose?

Answer 1

The problem is caused because a single HttpClientHandler instance is used for all requests. It's the HttpClientFactory's job to manage, pool and recycle handlers.

It looks like the actual question is how to disable certificate validation when using HttpClientFactory. This requires configuring the client handlers used by it.

As the documentation shows this is done using the ConfigurePrimaryHttpMessageHandler method. From the method's remarks :

Remarks

The delegate should return a new instance of the message handler each time it is invoked.

The handlers created by that method will be added to a handler pool and used by other handlers like Polly's retry handlers. HttpClientFactory will recycle older handlers to handle DNS registration changes.

The code should look like this:

services.AddHttpClient<HttpWrapper>("ignoreSSL")
        .ConfigurePrimaryHttpMessageHandler(() =>
        {
            return new HttpClientHandler
            {
                ServerCertificateCustomValidationCallback = (m, crt, chn, e) => true
            };
        });