C# HTTP Examples

C# Basic

C# Data Type

C# OOP

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C# Advanced

HTTP GET request in C#

To make an HTTP GET web request to a URL in C#, you can use the HttpClient class from the System.Net.Http namespace. Here's an example:

using System.Net.Http;
using System.Threading.Tasks;

public async Task<string> GetResponseAsync(string url)
{
    using (var client = new HttpClient())
    {
        var response = await client.GetAsync(url);
        return await response.Content.ReadAsStringAsync();
    }
}

This code defines a method called GetResponseAsync that takes a URL as input and returns a Task<string> that will contain the response content.

To make an asynchronous HTTP GET request to a URL in C#, you can use the HttpClient.GetAsync method, which returns a Task<HttpResponseMessage> that you can await. Here's an example:

using System.Net.Http;
using System.Threading.Tasks;

public async Task<string> GetResponseAsync(string url)
{
    using (var client = new HttpClient())
    {
        var response = await client.GetAsync(url);
        return await response.Content.ReadAsStringAsync();
    }
}

This code is the same as the previous example, but it uses the await keyword to asynchronously wait for the response to be returned.

C# HttpClient GET example:

Basic example of making an HTTP GET request using HttpClient.

Code snippet:

using (HttpClient client = new HttpClient())
{
    HttpResponseMessage response = await client.GetAsync("https://api.example.com/data");
    if (response.IsSuccessStatusCode)
    {
        string content = await response.Content.ReadAsStringAsync();
        // Process content
    }
}

C# HTTPClient send GET request:

Sending an HTTP GET request using HttpClient.

Code snippet:

HttpClient client = new HttpClient();
HttpResponseMessage response = await client.GetAsync("https://api.example.com/data");

GET request in C# using WebClient:

Making an HTTP GET request using WebClient.

Code snippet:

using (WebClient client = new WebClient())
{
    string result = client.DownloadString("https://api.example.com/data");
    // Process result
}

Asynchronous HTTP GET request in C#:

Performing an asynchronous HTTP GET request.

Code snippet:

using (HttpClient client = new HttpClient())
{
    HttpResponseMessage response = await client.GetAsync("https://api.example.com/data");
    if (response.IsSuccessStatusCode)
    {
        string content = await response.Content.ReadAsStringAsync();
        // Process content
    }
}

Query parameters in C# HTTP GET request:

Including query parameters in an HTTP GET request.

Code snippet:

string apiUrl = "https://api.example.com/data";
string queryString = "?param1=value1&param2=value2";
using (HttpClient client = new HttpClient())
{
    HttpResponseMessage response = await client.GetAsync(apiUrl + queryString);
    // Process response
}

REST API GET request in C#:

Making a GET request to a REST API endpoint.

Code snippet:

using (HttpClient client = new HttpClient())
{
    HttpResponseMessage response = await client.GetAsync("https://api.example.com/api/resource");
    // Process response
}

Deserialize JSON from GET request in C#:

Deserializing JSON content from an HTTP GET response.

Code snippet:

using (HttpClient client = new HttpClient())
{
    HttpResponseMessage response = await client.GetAsync("https://api.example.com/data");
    if (response.IsSuccessStatusCode)
    {
        string jsonContent = await response.Content.ReadAsStringAsync();
        var data = JsonConvert.DeserializeObject<MyModel>(jsonContent);
        // Process data
    }
}

HTTP GET request with headers in C#:

Adding headers to an HTTP GET request.

Code snippet:

using (HttpClient client = new HttpClient())
{
    client.DefaultRequestHeaders.Add("Authorization", "Bearer your_access_token");
    HttpResponseMessage response = await client.GetAsync("https://api.example.com/data");
    // Process response
}

C# HTTP GET request timeout:

Setting a timeout for an HTTP GET request in C#.

Code snippet:

using (HttpClient client = new HttpClient())
{
    client.Timeout = TimeSpan.FromSeconds(10); // Set timeout to 10 seconds
    HttpResponseMessage response = await client.GetAsync("https://api.example.com/data");
    // Process response
}

Handling redirects in C# HTTP GET request:

Following redirects in an HTTP GET request.

Code snippet:

using (HttpClientHandler handler = new HttpClientHandler())
using (HttpClient client = new HttpClient(handler))
{
    handler.AllowAutoRedirect = true;
    HttpResponseMessage response = await client.GetAsync("https://api.example.com/data");
    // Process response
}

C# HTTP GET request with authentication:

Making an authenticated HTTP GET request.

Code snippet:

using (HttpClient client = new HttpClient())
{
    var credentials = new NetworkCredential("username", "password");
    client.DefaultRequestHeaders.Authorization = new CredentialCache { { new Uri("https://api.example.com"), "Basic", credentials } };
    HttpResponseMessage response = await client.GetAsync("https://api.example.com/data");
    // Process response
}

URL encoding in C# HTTP GET request:

Encoding parameters in the URL for an HTTP GET request.

Code snippet:

string parameterValue = "value with spaces";
string encodedValue = Uri.EscapeDataString(parameterValue);
string apiUrl = $"https://api.example.com/data?param={encodedValue}";
using (HttpClient client = new HttpClient())
{
    HttpResponseMessage response = await client.GetAsync(apiUrl);
    // Process response
}

C# HTTP GET request error handling:

Handling errors in an HTTP GET request.

Code snippet:

using (HttpClient client = new HttpClient())
{
    try
    {
        HttpResponseMessage response = await client.GetAsync("https://api.example.com/data");
        response.EnsureSuccessStatusCode(); // Throws exception for non-success status codes
        // Process response
    }
    catch (HttpRequestException ex)
    {
        // Handle exception
    }
}

HTTP GET request with cancellation in C#:

Cancelling an ongoing HTTP GET request.

Code snippet:

using (CancellationTokenSource cts = new CancellationTokenSource())
using (HttpClient client = new HttpClient())
{
    cts.CancelAfter(TimeSpan.FromSeconds(5)); // Cancel after 5 seconds
    try
    {
        HttpResponseMessage response = await client.GetAsync("https://api.example.com/data", cts.Token);
        // Process response
    }
    catch (TaskCanceledException ex)
    {
        // Handle cancellation
    }
}