Is Creating a New HttpClient for Each Web API Call Truly Efficient?

HTTPClient instance life cycle: Single example mode or every request is built?

In the Web API client application, the best life cycle of the HTTPClient object has been controversial. Some people advocate creating a new example for each call, while others advocate calling and reusing a single example multiple times.

Create a new httpclient

Create a new HTTPClient for each request to introduce some expenses, including:

credentials and cookie management:

HTTPClientHandler maintenance credentials and cookies, these credentials and cookies are designed to reuse them across. The efficiency of resetting these values ​​separately for each request is low.

The default request header:
• Configure the default request header (such as the Accept header) on the new HTTPClient instance (such as the Accept head). httpmessagehandlers:
If you use HTTPMESSAGEHANDLERS for log records, throwing or other horizontal sectaries, you need to re -configure them on each new httpclient.
• TCP/IP Connection Management: Disposal HTTPClient will close its associated HTTPClientHandler and force the TCP/IP connection. This requires a re -establishment of each request, which leads to potential performance losses, especially on the Internet or for HTTPS connection.
• Reuse a single httpclient
• For multiple calls and reuse the same HTTPClient instance, it can minimize these expenses and provide other benefits:
Enhanced functional utilization:

HTTPClient's features (for example, httpmessagehandler) are designed for multiple calls, which can efficiently provide cross -sectional attention.

Connection pool: Reuse the TCP/IP connection through HTTPClient to reuse the TCP/IP connection to avoid re -establishing the connection for each request to improve performance.

Status processing program:

HTTPMESSAGEHANDLERS can maintain the application -level state between requests, which is difficult to achieve each time the HTTPClient instance is instantiated.

• Suggestion
• Based on the expense analysis, it is generally recommended to maintain an application life cycle for each access independent API. This method provides the best balance between resource efficiency, performance and function.

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