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

Explains environment-variable lookup, multiple URLs, wildcard behavior, hostname limits, and HTTPS-only listening.

ASPNETCORE_URLS

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

ASPNETCORE_URLS is an environment variable that specifies the URL or URLs on which an ASP.NET Core application listens.

ASPNETCORE_URLS is an environment variable that sets the URL or URLs where an ASP.NET Core application listens. It is especially useful when deploying outside IIS, where the application’s listening address must be configured explicitly. section 27.0 section 27.4

Set a local listening URL

Set ASPNETCORE_URLS to http://localhost:8000, then run the published application in the same command window. ASP.NET Core uses that value and listens on port 8000 locally. section 27.4

Use the value carefully because the address determines which requests the application accepts:

Separate multiple URLs with semicolons, such as http://localhost:5001;http://*:5002. section 27.4
Use localhost to accept requests only from the local computer; use * to accept requests on that port through any URL mapped to the computer. section 27.4
Do not use this setting to bind to one named domain; ASP.NET Core listens to requests on the port rather than filtering domain names. section 27.4
For an API that must reject HTTP entirely, configure only an HTTPS URL, such as https://*:5001. section 28.4.3

http://localhost:5001;http://*:5002

Compare a local-only endpoint with a wildcard endpoint in one configuration value. section 27.4

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

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Related concepts

uriconfigures · A URI (Uniform Resource Identifier) is a standardized character sequence that identifies an abstract or physical resource.
environment variablekind of · An environment variable is a named value supplied through an operating-system or process environment and made available to programs for runtime configuration or information.
command-line argumentalternative to · A command-line argument is a value supplied to a program when it is invoked, either as positional input or as an option that configures its behavior.
HTTPSconfigures · HTTPS is HTTP carried over TLS, which provides encryption and endpoint authentication for network communication.
launchSettings.jsoncontrasts with · launchSettings.json is a .NET development configuration file defining local launch profiles and settings such as URLs, ports, and environment variables.
HttpsRedirectionMiddlewarecontrasts with · HttpsRedirectionMiddleware is ASP.NET Core middleware that redirects eligible HTTP requests to their corresponding HTTPS URLs.

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.