echo_service.bal

import ballerina/config;
import ballerina/http;
import ballerina/log;

listener http:Listener echoListener = new http:Listener(config:getAsInt("echo.httpPort"));

listener http:Listener echoSecureListener = new http:Listener(config:getAsInt("echo.httpsPort"), config = {
    secureSocket: {
        keyStore: {
            path: config:getAsString("echo.keystore.path"),
            password: config:getAsString("echo.keystore.password")
        }
    }
});

@http:ServiceConfig {
    basePath: "echo"
}
service echo on echoListener, echoSecureListener {

    @http:ResourceConfig {
        path: "/"
    }
    resource function echo(http:Caller caller, http:Request request) returns error? {
        string payload = check request.getTextPayload();
        var result = caller->respond(untaint payload);
        if (result is error) {
            log:printError("Failed to respond to caller", err = result);
        }
    }
}