Connection pooling

As explained in ASP.NET Core in Action, 3e

Connection pooling is the reuse of established network connections across multiple client requests to reduce connection-setup overhead.

Connection pooling reuses established network connections for multiple client requests, reducing connection-setup overhead. In .NET, SocketsHttpHandler supports pooling and recycling, while IHttpClientFactory manages handler lifetime and reuse. section 33.2.1

Pool connections with IHttpClientFactory

Register the factory with builder.Services.AddHttpClient(), inject IHttpClientFactory into an endpoint, create an HttpClient, set its BaseAddress, and call the remote API. The factory creates a client whose handler it manages. section 33.2.1

Figure 33.4 Each HttpClient contains a pipeline of HttpMessageHandlers. The final handler is an HttpClientHandler, which makes the connection to the remote server and sends the HTTP request. This configuration is similar to the ASP.NET Core middleware pipeline, and it allows you to make cross-cutting adjustments to outgoing requests.

Trace how HttpClient handlers form a pipeline and how the final handler connects to the remote server. section 33.2.1

How ASP.NET Core in Action, 3e covers it

How deep it goes

Explains handler lifetime, pooling, and recycling, but defers detailed manual SocketsHttpHandler configuration.

Examples

Uses an ASP.NET Core endpoint calling https://example.com/rates/latest through a factory-created HttpClient.

What it assumes

Assumes familiarity with HttpClient and remote API calls while showing factory registration and injection explicitly.

What you can do after

Operate pooled HTTP clients through IHttpClientFactory in dependency-injected .NET applications.

How it connects

Connects connection pooling with HttpClient, SocketsHttpHandler, IHttpClientFactory, dependency injection, and HTTP handlers.

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Also explained in

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  Rust Servers, Services, and AppsA connection pool is a managed collection of reusable database connections shared among clients or execution threads.
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  Logs and TelemetryConnection pooling is the practice of maintaining reusable database connections so operations can execute without repeatedly establishing new connections.
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  Elixir in Action, Third EditionA database connection pool is a bounded collection of reusable database connections managed to constrain simultaneous database operations.
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  Go by ExampleA connection pool is a managed collection of reusable network connections maintained to avoid repeatedly establishing new connections.
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  PostgreSQL Mistakes and How to Avoid ThemConnection pooling is a technique that reuses a bounded set of database connections to serve a larger number of client requests.
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  100 Go Mistakes and How to Avoid ThemA database connection pool is a managed collection of reusable database connections that are allocated to operations and returned for later use.

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Related concepts

• database connectionuses · A database connection is an active communication channel or session through which software sends operations to and receives results from a database system.
• connection poolerimplemented by · A connection pooler is software that maintains reusable database connections and assigns them to application requests as needed.

This explainer was generated by Manning's knowledge graph from the text of ASP.NET Core in Action, 3e. The section links point to the parts of the book it draws on.