How to Automatically Decompress GZip Responses Using HttpClient in WCF and .NET Core?

Efficiently Handling Compressed HTTP Responses with HttpClient

Many HTTP APIs return compressed data (like GZip), requiring decompression before use. This article demonstrates how to automatically decompress GZip responses using HttpClient within WCF services and .NET Core applications.

For automatic GZip decompression, configure your HttpClient as follows:

<code class="language-csharp">HttpClientHandler handler = new HttpClientHandler()
{
  AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate
};

using (var client = new HttpClient(handler))
{
  // Your HTTP requests here
}</code>

This simple addition ensures that GZip and Deflate compressed responses are automatically handled.

Best Practice: Singleton HttpClient

To avoid resource exhaustion (port exhaustion), it's best practice to use a singleton HttpClient instance:

<code class="language-csharp">private static HttpClient client = null;

public void InitializeClient()
{
  if (client == null)
  {
    HttpClientHandler handler = new HttpClientHandler()
    {
      AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate
    };
    client = new HttpClient(handler);
  }
  // Your code using 'client'
}</code>

.NET Core 2.1 and Above: IHttpClientFactory

For .NET Core 2.1 and later versions, leverage IHttpClientFactory for dependency injection and improved management:

<code class="language-csharp">var timeout = Policy.TimeoutAsync<HttpResponseMessage>(TimeSpan.FromSeconds(60));

services.AddHttpClient<XApiClient>().ConfigurePrimaryHttpMessageHandler(() => new HttpClientHandler
{
  AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate
}).AddPolicyHandler(request => timeout);</code>

This approach integrates seamlessly with the .NET Core dependency injection system, enhancing maintainability and testability.

By implementing these methods, you can easily and efficiently handle GZip-compressed responses from your HttpClient, simplifying your data processing workflow.

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