Aborts all requests on this instance

C#
httpClient.Abort();

Sends a DELETE request to the specified Uri and returns the response. Data to be sent is specified as an IHttpContent, the available types are detailed here

C#
httpClient.Delete(new Uri("http://httpbin.org/delete"), HttpCompletionOption.AllResponseContent, (r) => 
{
    // Raised either when the download completes or periodically depending on the HttpCompletionOption
});

// or

var response = await httpClient.DeleteAsync(new Uri("http://httpbin.org/delete"));

C#
httpClient.Delete(new Uri("http://httpbin.org/delete"), new StringContent("Hello World"), HttpCompletionOption.AllResponseContent, (r) => 
{
    // Raised either when the download completes or periodically depending on the HttpCompletionOption
}, (u) =>
{
    // Raised periodically when uploading, this callback does not need to be specified
});

// or

var response = await httpClient.DeleteAsync(new Uri("http://httpbin.org/delete"), new StringContent("Hello World"));

Sends a GET request to the specified Uri and returns the response

C#
httpClient.Get(new Uri("http://httpbin.org/get"), HttpCompletionOption.AllResponseContent, (r) => 
{
    // Raised either when the download completes or periodically depending on the HttpCompletionOption
});

// or

var response = httpClient.GetAsync(new Uri("http://httpbin.org/get"));

Sends a PATCH request to the specified Uri and returns the response. Data to be sent is specified as an IHttpContent, the available types are detailed here

C#
httpClient.Patch(new Uri("http://httpbin.org/patch"), new StringContent("Hello World"), HttpCompletionOption.AllResponseContent, (r) => 
{
    // Raised either when the download completes or periodically depending on the HttpCompletionOption
}, (u) =>
{
    // Raised periodically when uploading, this callback does not need to be specified
});

// or

var response = await httpClient.PatchAsync(new Uri("http://httpbin.org/patch"), new StringContent("Hello World"));

Sends a POST request to the specified Uri and returns the response. Data to be sent is specified as an IHttpContent, the available types are detailed here

C#
httpClient.Post(new Uri("http://httpbin.org/post"), new StringContent("Hello World"), HttpCompletionOption.AllResponseContent, (r) => 
{
    // Raised either when the download completes or periodically depending on the HttpCompletionOption
}, (u) =>
{
    // Raised periodically when uploading, this callback does not need to be specified
});

// or

var response = await httpClient.PostAsync(new Uri("http://httpbin.org/post"), new StringContent("Hello World"));

Sends a PUT request to the specified Uri and returns the response. Data to be sent is specified as an IHttpContent, the available types are detailed here

C#
httpClient.Put(new Uri("http://httpbin.org/put"), new StringContent("Hello World"), HttpCompletionOption.AllResponseContent, (r) => 
{
    // Raised either when the download completes or periodically depending on the HttpCompletionOption
}, (u) =>
{
    // Raised periodically when uploading, this callback does not need to be specified
});

// or

var response = await httpClient.PutAsync(new Uri("http://httpbin.org/put"), new StringContent("Hello World"));

Use Send if you need more control over the request, for example including headers only for this request. If duplicate headers exist between the HttpClient instance and the request then the request header will take precedence

C#
var message = new HttpRequestMessage()
{
    Uri = new Uri("http://httpbin.org/post"),
    Method = HttpAction.Get,
    Content = new StringContent("Hello World")
};

message.Headers.Add("SomeHeader", "SomeValue");

httpClient.Send(message, HttpCompletionOption.AllResponseContent, (r) => 
{
    // Raised either when the download completes or periodically depending on the HttpCompletionOption
}, (u) =>
{
    // Raised periodically when uploading, this callback does not need to be specified
});

// or

var response = httpClient.SendAsync(message);