extensions/rest/runtime/src/main/doc/configuration.adoc

This extension depends on the xref:reference/extensions/platform-http.adoc[Platform HTTP] extension
and configures it as the component that provides the REST transport.

### Path parameters containing special characters with platform-http

When using the `platform-http` REST transport, some characters are not allowed within path parameter names. This includes the '-' and '$' characters.

In order to make the below example REST `/dashed/param` route work correctly, a system property is required `io.vertx.web.route.param.extended-pattern=true`.

[source,java]
----
import org.apache.camel.builder.RouteBuilder;

public class CamelRoute extends RouteBuilder {

    @Override
    public void configure() {
        rest("/api")
            // Dash '-' is not allowed by default
            .get("/dashed/param/{my-param}")
            .to("direct:greet")

            // The non-dashed path parameter works by default
            .get("/undashed/param/{myParam}")
            .to("direct:greet");

            from("direct:greet")
                .setBody(constant("Hello World"));
    }
}
----

There is some more background to this in the https://vertx.io/docs/vertx-web/java/#_capturing_path_parameters[Vert.x Web documentation].

### Configuring alternate REST transport providers

To use another REST transport provider, such as `netty-http` or `servlet`, you need to add the respective
extension as a dependency to your project and set the provider in your `RouteBuilder`. E.g. for `servlet`, you'd
have to add the `org.apache.camel.quarkus:camel-quarkus-servlet` dependency and the set the provider as
follows:

[source,java]
----
import org.apache.camel.builder.RouteBuilder;

public class CamelRoute extends RouteBuilder {

    @Override
    public void configure() {
        restConfiguration()
                .component("servlet");
        ...
    }
}
----