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configure ssl for a grails 2.3.2 app hosted on *.herokuapp.com

This snippet configures proper detection of the http/https channel security by a Grails 2.3.2 application using the (latest) Spring Security 2.0-RC2 grails plugin. This configuration resides-in grails-app/conf/Config.groovy.

// belongs in 'production' environment block or guarded by, e.g. a System.property-check.

// [heroku] proxy support -- allow SSL to be terminated at the load balancer / proxy
// look for X-FORWARDED-PROTO (case-sensitive)
// https://discussion.heroku.com/t/grails-spring-security-core-securechannel-definition-causes-redirect-loop/219/2

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#import "AppDelegate.h"

#import <WNGLogger/logger.h>
#import <WNGLogger/NSURLConnection+WNGLogging.h> //add WNGLogging category to NSURLConnection

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application
        didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{

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import Foundation
import UIKit

let  apiKey = "specify your api key here";
WNGLogger.initSharedLogger(apiKey)
WNGLogger.sharedLogger().recordStart("application-launch")
NSURLConnection.wng_enableLogging()

UIApplicationMain(C_ARGC, C_ARGV, NSStringFromClass(UIApplication), NSStringFromClass(AppDelegate))

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module.exports = function (grunt) {

  grunt.initConfig({
    sitespeedio: {
      default: {
        options: {
          urls: ['http://localhost:8000'],
          deepth: 1,
          connection: 'cable',
          resultBaseDir: 'sitespeed.out',

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kermit:iteratephx.github.io(frontend-perfmatters) skuenzli$ open sitespeed.out/localhost/2015-08-18-22-32-55
kermit:iteratephx.github.io(frontend-perfmatters) skuenzli$ node_modules/.bin/gulp sitespeedio
[22:34:37] Analyze your sites web performance
[22:34:37] Using gulpfile ~/dev/dev.weblog-ng/iteratephx.github.io/gulpfile.js
[22:34:37] Starting 'sitespeedio'...
info: OS: 'darwin 14.3.0', Node.js: 'v0.10.23', sitespeed.io: '3.5.0', PhantomJS: '1.9.8', java: '1.7.0_67', browsertime: '0.9.4'
info: Will analyze 1 pages
info: Running YSlow for http://localhost:8000 [phantomjs]
verbose: Done processing url in yslow: http://localhost:8000
info: Done analyzing urls

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@Bean
public ActorSystem actorSystem() {
  ActorSystem system = ActorSystem.create("actor-system");
  // initialize the application context in the Akka Spring Extension
  SpringExtProvider.get(system).initialize(applicationContext);
  return system;
}

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/**
 * Create a Props for the specified actorBeanName using the
 * SpringActorProducer class.
 *
 * @param actorBeanName The name of the actor bean to create Props for
 * @return a Props that will create the named actor bean using Spring
 */
public Props props(String actorBeanName) {
  return Props.create(SpringActorProducer.class, applicationContext, actorBeanName);
}

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@Override
public Actor produce() {
  println "produce() called for actorBeanName: ${actorBeanName}"
  return (Actor) applicationContext.getBean(actorBeanName);
}

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class NumberController {

    static final FiniteDuration DURATION_3_SECONDS = FiniteDuration.create(3, TimeUnit.SECONDS)
    static final TIMEOUT_3_SECONDS = Timeout.durationToTimeout(DURATION_3_SECONDS)

    ActorSystem actorSystem  //actorSystem is injected by Spring via standard Grails behavior

    def random() {
        def requestId = UUID.randomUUID().toString()

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// the service that will be automatically injected
final NumberService numberService;

@Inject
public NumberActor(@Named("NumberService") NumberService numberService) {
  this.numberService = numberService;
}

@Override
public void onReceive(Object message) throws Exception {