Chapter 56: HTTP clients
Section 56.1: Reading GET response as string using System.Net.HttpClient
HttpClient is available through NuGet: Microsoft HTTP Client Libraries.
string requestUri = "http://www.example.com"; string responseData;
using (var client = new HttpClient())
{
using(var response = client.GetAsync(requestUri).Result)
{
response.EnsureSuccessStatusCode();
responseData = response.Content.ReadAsStringAsync().Result;
}
}
Section 56.2: Basic HTTP downloader using System.Net.Http.HttpClient
using System; using System.IO; using System.Linq;
using System.Net.Http;
using System.Threading.Tasks;
class HttpGet
{
private static async Task DownloadAsync(string fromUrl, string toFile)
{
using (var fileStream = File.OpenWrite(toFile))
{
using (var httpClient = new HttpClient())
{
Console.WriteLine("Connecting...");
using (var networkStream = await httpClient.GetStreamAsync(fromUrl))
{
Console.WriteLine("Downloading...");
await networkStream.CopyToAsync(fileStream); await fileStream.FlushAsync();
}
}
}
}
static void Main(string[] args)
{
try
{
Run(args).Wait();
}
catch (Exception ex)
{
if (ex is AggregateException)
ex = ((AggregateException)ex).Flatten().InnerExceptions.First();
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Console.WriteLine("--- Error: " + (ex.InnerException?.Message ?? ex.Message));
}
}
static async Task Run(string[] args)
{
if (args.Length < 2)
{
Console.WriteLine("Basic HTTP downloader"); Console.WriteLine();
Console.WriteLine("Usage: httpget <url>[<:port>] <file>"); return;
}
await DownloadAsync(fromUrl: args[0], toFile: args[1]);
Console.WriteLine("Done!");
}
}
Section 56.3: Reading GET response as string using System.Net.HttpWebRequest
string requestUri = "http://www.example.com"; string responseData;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(parameters.Uri); WebResponse response = request.GetResponse();
using (StreamReader responseReader = new StreamReader(response.GetResponseStream()))
{
responseData = responseReader.ReadToEnd();
}
Section 56.4: Reading GET response as string using System.Net.WebClient
string requestUri = "http://www.example.com"; string responseData;
using (var client = new WebClient())
{
responseData = client.DownloadString(requestUri);
}
Section 56.5: Sending a POST request with a string payload using System.Net.HttpWebRequest
string requestUri = "http://www.example.com"; string requestBodyString = "Request body string."; string contentType = "text/plain";
string requestMethod = "POST";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(requestUri)
{
Method = requestMethod, ContentType = contentType,
};
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byte[] bytes = Encoding.UTF8.GetBytes(requestBodyString); Stream stream = request.GetRequestStream(); stream.Write(bytes, 0, bytes.Length);
stream.Close();
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Section 56.6: Sending a POST request with a string payload using System.Net.WebClient
string requestUri = "http://www.example.com"; string requestBodyString = "Request body string."; string contentType = "text/plain";
string requestMethod = "POST";
byte[] responseBody;
byte[] requestBodyBytes = Encoding.UTF8.GetBytes(requestBodyString);
using (var client = new WebClient())
{
client.Headers[HttpRequestHeader.ContentType] = contentType;
responseBody = client.UploadData(requestUri, requestMethod, requestBodyBytes);
}
Section 56.7: Sending a POST request with a string payload using System.Net.HttpClient
HttpClient is available through NuGet: Microsoft HTTP Client Libraries.
string requestUri = "http://www.example.com"; string requestBodyString = "Request body string."; string contentType = "text/plain";
string requestMethod = "POST";
var request = new HttpRequestMessage
{
RequestUri = requestUri, Method = requestMethod,
};
byte[] requestBodyBytes = Encoding.UTF8.GetBytes(requestBodyString); request.Content = new ByteArrayContent(requestBodyBytes);
request.Content.Headers.ContentType = new MediaTypeHeaderValue(contentType);
HttpResponseMessage result = client.SendAsync(request).Result; result.EnsureSuccessStatusCode();
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