Httpclient This instance has already started one or more requests. Properties can only be modified before sending the first request

Question

I am creating an application in .Net Core 2.1 and I am using http client for web requests. The issue is I have to send parallel calls to save time and for that I am using Task.W

Answer 1

Maybe my two cents will help someone.

I ran into this issue when refreshing the page when debugging the application.

I was using a singleton, but each refresh, it was trying to set the base address. So I just wrapped it in a check to see if the base address had already been set.

The issue for me was, it was trying to set the baseAddress, even though it was already set. You can't do this with a httpClient.

if (_httpClient.BaseAddress == null)
{
    _httpClient.BaseAddress = new Uri(baseAddress);
}