Avoiding Deadlock with HttpClient

Question

What is the best way to use HttpClient and avoid deadlock? I am using the code below, called entirely from synchronous methods, but I concerned it maybe causing

Answer 1

I think you mean avoid blocking. Deadlocks refer to situations where two or more threads are all indefinitely waiting for each other to finish.

To avoid blocking in your sample code, instead of synchronously waiting on Results, you just need to await the non-blocking API calls:

HttpContent content = new StringContent(json, Encoding.UTF8, "application/json");
using (HttpClient client = new HttpClient())
{
    HttpResponseMessage responseMessage = null;

    switch (verb)
    {
        case HttpVerb.Put:
            responseMessage = await client.PutAsync(url, content);
            break;
        case HttpVerb.Post:
            responseMessage = await client.PostAsync(url, content);
            break;
        case HttpVerb.Delete:
            responseMessage = await client.DeleteAsync(url);
            break;
        case HttpVerb.Get:
            responseMessage = await client.GetAsync(url);
            break;
    }

    if (responseMessage.IsSuccessStatusCode)
    {
        responseContent = await responseMessage.Content.ReadAsStringAsync();
        statusCode = responseMessage.StatusCode;
    }
}