How deeply does ASP.NET Core in Action, 3e cover Map?

Explains prefix matching, branch execution, and PathBase handling, while deferring route parameters and favoring endpoint routing.

Map

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

MapMethods is an ASP.NET Core endpoint-mapping method for associating a URL pattern and handler with one or more specified HTTP methods.

Map branches the ASP.NET Core middleware pipeline according to a request URL path. Requests matching a specified path prefix enter the branch; other requests continue through the main pipeline. section 31.1.2

Use Map when a small group of requests needs different middleware behavior:

Specify a path prefix, such as /ping. section 31.1.2
Keep the main pipeline available for requests that do not match. section 31.1.2
Remember that a matched path segment moves from HttpContext.Path to PathBase. section 31.4

A /ping branch

app.Map("/ping", branch => { branch.UseExceptionHandler(); branch.Run(async context => { context.Response.ContentType = "text/plain"; await context.Response.WriteAsync("pong"); }); }); A request to /ping receives pong through the branch, while other requests continue to the application’s main middleware pipeline.

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

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Related concepts

branchconfigures · Branching is the selection among alternative execution paths according to a condition, outcome, or program state.
endpoint routingalternative to · Endpoint routing is an ASP.NET Core mechanism that matches incoming HTTP requests to endpoints and separates endpoint selection from endpoint execution.
middlewareuses · Middleware is an intermediate software component or layer that processes or mediates requests, messages, or operations between other components, often adding behavior or controlling their flow.
minimal APIused by · A minimal API is an ASP.NET Core programming model for defining HTTP endpoints with minimal framework ceremony, typically without controller classes.
lambdaused by · A lambda is a language construct that defines an unnamed function or callable, often as a value.

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.