# IHttpClientService

## Overview

The [IHttpClientService](/ai/components/api/services/ihttpclientservice.md) in Wisej.AI is utilized whenever an HTTP request is necessary, such as when interacting with LLM providers, vector databases, web searches, and other external services.

For instance, here's how the `WebSearchServiceBase` class utilizes the `IHttpClientService`:

{% tabs %}
{% tab title="C#" %}

```csharp
public WebSearchServiceBase(string url)
{
    _client = ServiceHelper.GetService<IHttpClientService>();
}

internal virtual IHttpClientService Client
{
    get
    {
        if (!_clientInitialized)
        {
            _clientInitialized = true;

            _client.SetHandler(new HttpClientHandler
            {
                AllowAutoRedirect = true,
#if !NETCOREAPP
                AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate
#else
                AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate | DecompressionMethods.Brotli
#endif
            });

            var apiKey = GetApiKey();
            if (!String.IsNullOrEmpty(apiKey) && !String.IsNullOrEmpty(this.Authentication))
            {
                _client.AddDefaultHeader(this.Authentication, apiKey);
            }

        }

        return _client;
    }
}
private bool _clientInitialized;
private IHttpClientService _client;

```

{% endtab %}
{% endtabs %}

The sample code above class creates an instance of the service and utilizes the `SetHandler()` method to enable decompression. It also employs the `AddDefaultHeader()` method to configure the authentication method and API key. Extending from `WebSearchServiceBase`, the `BingWebSearchService` class uses the `GetAsync()` method on the service instance to perform its operations.

## Default Implementation

The default implementation of `IHttpClientService` is in [`DefaultHttpClientService`](/ai/components/api/services/ihttpclientservice/wisej.ai.services.defaulthttpclientservice.md) and leverages an instance of `System.Net.Http.HttpClient` to handle HTTP requests.

This service acts as an intermediary between the application code utilizing it and the `HttpClient` instance. This design enables developers to implement their own version of `IHttpClientService`, allowing them to intercept and customize all HTTP interactions as needed.


---

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