Should HttpClient and HttpClientHandler Be Disposed Between Requests?

.NET HttpClient and HttpClientHandler: Dispose Between Requests?

In .NET Framework 4.5 and later, System.Net.Http.HttpClient and System.Net.Http.HttpClientHandler implement IDisposable via System.Net.Http.HttpMessageInvoker. Best practice dictates using using statements for proper disposal of IDisposable objects. However, advice from Microsoft personnel and community experts suggests that explicitly disposing of HttpClient instances is often unnecessary and might even be counterproductive.

Many online discussions and blog posts highlight the lack of negative consequences, and even potential drawbacks, from omitting Dispose() calls. Interestingly, official Microsoft documentation and code examples generally avoid explicit disposal of HttpClient and HttpClientHandler.

Why the IDisposable Implementation?

The IDisposable implementation exists to facilitate resource cleanup and management in situations where the objects are no longer needed. However, this is rarely a concern in typical usage scenarios.

Code Example Analysis:

The provided code sample demonstrates a safe approach using try-finally blocks within using statements. This guarantees disposal even if exceptions occur.

Summary:

While HttpClient and HttpClientHandler are designed with IDisposable in mind, the prevailing consensus is that explicit disposal is usually redundant. Resource constraints might warrant disposal, but it shouldn't be considered standard practice. Following Microsoft's example and using safe, efficient patterns without explicit Dispose() calls is generally recommended.

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