Path variable
A path variable is a named value embedded in a request URL path and made available to the handler processing that request.
Go in Practice, Second Edition
A path variable is a named value captured from a matched URL path and made available to the request handler.
- How it is used
- Routes requests containing URL-path identifiers to handlers that need those values.
- How deep it goes
- Works through route registration, value extraction, integer conversion, and response checks; does not develop advanced router internals.
- Examples
- Demonstrates `GET /comments/{id}` for comment lookup and `GET /goodbye/{name}` for a named greeting response.
- What you can do after
- Apply it via Go’s ServeMux and Request.PathValue to read a named path segment in an HTTP handler.
Read how Go in Practice, Second Edition explains path variable →
Spring in Action, Sixth Edition
A path variable is a value embedded in a URL path and bound to a controller method parameter.
- How it is used
- Retrieves one REST resource by binding a URL path value to a controller method parameter.
- How deep it goes
- Explains placeholders, parameter binding, repository lookup, Optional results, and explicit 404 handling.
- Examples
- Uses a taco endpoint that maps /api/tacos/{id} to a repository lookup by Long ID.
- What you can do after
- Apply it via Spring REST annotations to retrieve an identified resource and return an appropriate success or not-found response.
Read how Spring in Action, Sixth Edition explains path variable →
Related concepts
- @pathvariableuses · @PathVariable is a Spring MVC annotation that binds a controller method parameter to a variable embedded in the request path.
- uriuses · A URI (Uniform Resource Identifier) is a standardized character sequence that identifies an abstract or physical resource.
- routingused by · Routing is the selection of a path, destination, or processing component to direct an item, request, or flow toward an intended endpoint.
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