Should I Create a New HttpClient for Each Web API Call, or Reuse an Instance?

The performance impact of creating a new httpclient for each call is called

In the Webapi client scene, the life cycle of HTTPClient is a key consideration. This article discusses the performance overhead related to reusing existing instances for the creation of a new HTTPClient for each call.

Create and dispose of httpclient

Creation and disposal of HTTPClient involving the establishment and closing network connection, which will affect performance. The example code fragment demonstrates the creation and disposal of the new httpclient in each request:

Create the overhead of creating a new httpclient

<code>using (var client = new HttpClient())
{
    // API 请求
}</code>

Although the HTTPCLIENT provides functions such as reusable credentials, cookies and defaultRequestHeaders, it will bring a certain cost when creating a new example for each call. The sharing state between these attributes and management processing procedures has become unnecessary expenses. TCP connection management

The main performance problem is the disposal of HTTPClient, which will be forced to close the TCP/IP connection managed by ServicePointManager. This leads to establishing a new TCP connection for each request to use the new HTTPClient.

Performance impact

Performance impact depends on network conditions and connection types (HTTP/HTTPS). Observation results show that re -establishment of TCP connections through the Internet will lead to obvious performance losses.

Suggestion

In order to maximize performance expenses, it is recommended to maintain an HTTPClient instance for each unique API that access to penetrate the life cycle of the application. This method reduces the need to create and dispose of the HTTPClient instance, thereby improving performance.

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