google app engine gwt application doesnt load with custom domain - google-app-engine

I have deployed my app on google app engine here is the link
Than I have done all the stuff to create custom domain link to my app with custom domain
Obviously the static data from app is loaded without the gwt module
(Right now no data is inserted in highly replicated Datastore for sake of simplicity)

That's not an Gae issue but a Gwt issue. By the way - on my browser (Chrome 27) both domains work and the Gwt client is loaded. Without having any knowledge about your Gwt app it is really hard to debug.
There is one issue however:
http://hawt-project.appspot.com/hawtproject/hawtproject.nocache.js
has cache headers. And this might cause your browser to load an old version of your application. And this might cause your page to look broken. It would also explain why it works for me - and not for you.
Try to clean your browser cache and reload your page. If it works => Adjust Gae's static file cache settings in appengine-web.xml (If it's Java) - well you should do that anyway - caching nocache.js is just wrong.

Related

How can I leverage CDN with my AngularJS app on ASP.NET MVC?

I have an MVC project which really just serves an angular application. This will be a public application and I expect it to get a lot of traffic, so I'm trying to use a CDN to keep requests to my servers light.
I've found many articles on how to get angular itself from a CDN but what I'm looking for is for MY file (css, html, js, media) to get served from a CDN. So for example, if I have a directive, then the template would need to be served from a CDN, but I can't hard-code it because the template may not have been uploaded to the test or prod environments yet.
Update: The MVC application only serves the initial layout and home pages. Once my angular script loads MVC isn't really used anymore. The back-end is a separate Web API application.
You might be asking the wrong question, but you're on the right track for how to optimize for high traffic.
First, learn how to serve the angular application as static files. On a past project I worked on I had two projects in my visual studio solution, one was a Web API back-end, and the other was a web project that just served static content. You can configure Visual Studio to run both projects at the same time on different ports from localhost. This doesn't answer your question, but setting up dev like this will get you a step closer.
Next, once you know your project's front-end and back-end are decoupled from the server level, make sure you're not going to get an CORS issues from cross-domain requests. If you're going to be serving your back-end from a subdomain, CORS may be an issue. Look into that, you'll probably need to add some code to your MVC app to solve that problem.
Now that you've got all that figured out, find out how to use a CDN service. There are many offerings with specifics of how to deploy content and SSL certificates varying for each. Amazon Web Services, Microsoft Azure, and many others offer CDN services, but before you even look at that stuff, make sure you can actually serve your back-end from a different port on your dev machine and it still works.
I was trying to think of a good solution to this recently...
In local testing (grunt serve), i use the current non-minified .js/.css file, but when creating a build (grunt build), Id want to point those files to the CDN in my Angular project.
I'm thinking for your grunt(gulp/webpack/etc) build (which creates the minified local files for the build), you could make a task to prepend certain urls/files to your CDN via
https://github.com/callumlocke/grunt-cdnify or https://github.com/tactivos/grunt-cdn (but it would still use your non-minified files for grunt serve).
It would be cool if uploading to CDN and invalidating the files was a grunt/gulp/webpack plugin.
Then you could automate it as part of your prod builds.
Guessing your build system like Jenkins/etc would upload your app to wherever.
and then either with a grunt/gulp plugin like so could invalidate your files:
https://github.com/keycdn/grunt-keycdn if you use that CDN service.
I am guessing your build system like Jenkins could also do this work for you via its own CDN upload/invalidation plugins.
I know this answer is mentioning grunt specifically, but there should be similar plugins for gulp/webpack/etc as well.

Chrome desktop application for web based product

Chrome desktop application for web based product. Is this possible in chrome web apps
Product has following items
Angular JS --- Front-end framework
Rails --- JSon Communication
I have created the chrome desktop apps, which will directly open the site with icon. It's more feel like desktop application. In any OS it will run. The thing is working fine.
Problem:
It will always download the js and css files.
How i want to develop the chrome desktop apps
When launching the chrome desktop app, save all the assets locally.
Whenever chrome desktop app launched, it should refer the locally saved assets (I mean angular js files and css)
Before launching the chrome desktop app, it should request the server whether the assets are changed or not. If changed delete the locally saved files and save the latest one.
If assets are not changed use the old assets files. In this way, we can avoid the initial loading of all the files from the server.
Anybody did it previously or chrome provide any options for this?
Ideas are welcome!
Its totaly possible.
Read these docs: https://developer.chrome.com/apps/offline_apps
By myself i pack the css and javascript into the chrome app so you never have to download them on startup. But in your context its more like a webview app with caching functions.
You can use indexeddb or other local storage APIs to store assets in the client computer.
You can solve this on the web app side by employing ApplicationCache, which specifically fits what you describe.
Using the cache interface gives your application three advantages:
Offline browsing - users can navigate your full site when they're offline
Speed - resources come straight from disk, no trip to the network.
Resilience - if your site goes down for "maintenance" (as in, someone accidentally breaks everything), your users will get the offline experience
The Application Cache (or AppCache) allows a developer to specify which files the browser should cache and make available to offline users. Your app will load and work correctly, even if the user presses the refresh button while they're offline.
While it is primarily an offline-fallback technique, it allows you to cache resources locally just for speedup purposes. Actually having an offline fallback is a bonus in this case.
Actually building a Chrome app for this will probably not help - you cannot update local resources from your web app side, you'll need to update your app through WebStore channels only.

Structuring a Rails and Angular app

I'd like to build a new single page app using Rails 4 and Angular and Capistrano for deployment process.
I want all the front end to be a static app on Amazon S3, but I'm openminded for other suggestions.
What's important to me is a fast developing process with the ability to scale up easily.
I was wondering what is the best structure I should use:
keep all assets in app/assets and set Bower path to vender directory.
that way i can use rails precompile methods and enjoying Rails html tags for index.html, but i'm sure it will be easy to upload it to S3 and keep it separated.
keep all assets including Bower components in public/app directory, which will keep it as a complete separate application, but then i need to use Grunt or any other service for precompiling assets.
any other idea?
From my experience, I found this approach to work really well:
API app (Rails/Sinatra/Grape/Node/whatever) serves only JSON APIs. Deploys to a server, say api.yourapp.com. Serves Access-Control headers.
Static web app: started by generating with yeoman an AngularJS, Gulp, Bower app. Deploys using gulp aws deploy module to S3.
There's no real reason to have both views and apis in the same app or built with the same technology (as in Rails).
Now there are issues:
S3 doesn't support nicely Angular's HTML5 mode URLs. So pure S3 website isn't an option.
Facebook doesn't read OpenGraph tags that are not in the source of the page.
Couldn't figure out the state of Google/SEO and Angular apps. I didn't see the content in the search results.
So as a solution I introduced another web server app. Can be based on anything - pure rack, node etc. I chose rack.
Solutions to the problems:
Web server app was hosted on www.yourapp.com and proxied (and cached) requests to S3. It supported all URLs (html5Mode) - just proxied to index.html.
OpenGraph meta tags - the API had an endpoint that gets a URL or ID of an object and returns meta tags information. Web server issues a request to API once per URL (caches the response) and injects it in the served index.html.
SEO - as a middleware, used prerender for rack that rendered pages on the server.
As a bonus -
Most apps today have a landing page/marketing site and the actual app. Sometimes it's better to maintain these separately. The web sever knows according to a cookie which app to present on www.yourapp.com - actual app or marketing site. On sign in - set a cookie on client side and voila.
First, I think there's a bit of a confusion here, let me try to clear it up.
There are a couple of ways for achieving this
Pure client -> API
When you have a static application, there's no need to go through the Rails asset pipeline, there are far better ways to manage assets when you are using the tooling for client side applications.
For example, your client application will be an Angular application and you will manage assets with a combination of bower (dependencies) and grunt (build and distribution).
There's no point of deploying to S3 with Capistrano, if it's a pure static application, you can use aws CLI in order to just upload your content.
I'd go through a CDN as well. Something like Fastly works really well over Amazon S3.
I have a Rake task that uploads to S3 and then clears the cache on Fastly (if I need to).
As for your Rails application, it would act as an API, it should not have any assets
Combined
If you have a combined application, some of the actions are served by the server (Rails) and just invokes some client side code (Angular).
If this is the case, I would go through Rails asset pipeline and just keep everything as Rails best practice with compilation pre-deploy etc...
It's one of those questions where "it depends" is the answer really, it all depends on what you want to achieve.
When I have a client application, I try to have a pure client and have the server only as an API, with no assets at all, this way, I separate the concerns.
EDIT 9/9/15
I'd have to say that as long as you can, I'd keep the apps separate.
It's not always possible, especially with more complex apps.
Most apps I have seen in the recent months have kept the client side and the server side code separate, I have seen less use of rails and more use of rails-api because of that (some even ditched rails completely for thinner solutions).

mystery "welcome" app from web2py on google app engine

I'm deploying, for the first time, an app on google app engine.
It seems to have succeeded, however when I go to my apps url I'm directed to the traditional "welcome" page from the default installation.
I do not have a "welcome" app. nothing about "welcome" is listed in my routes.py file.
so why am I directed to myURL/welcome/default/index ?
I can't even type in the direct url that I know I want to access without an "invalid request" error.
This also only happens when I upload and run from appspot.com, when I use the local development engine things are fine.
According to the dispatching rules, if you go to a URL without specifying an application, it will default to the init application, and if not found, it will then look for the welcome application. Also, if you used the standard app.example.yaml configuration file when deploying, the welcome application would have been included in your deployment (see the GAE deployment section of the book).
not much of an answer, because I still don't know exactly how the routing occurred, however I had the web2py app in 2 locations. On my local machine and on the web hosting server. I had been uploading the version from the hosting server to GAE. This one was failing. When I uploaded the one from my local machine things started to work.
So I must have had a discrepancy somewhere between the two I just couldn't find.
You must call your application: "init" and deploy it in GAE.
For example, if you have developed yourweb2pyapp, your main page will be yourweb2pyapp/default/index and your main page in GAE would be yourGAEapp.appspot.com/yourweb2pyapp/default/index.
But if you write in your browser yourGAEapp.appspot.com you go to yourGAEapp.appspot.com/welcome/default/index and this is the problem.
The simplest solution is that you call your application "init" instead of yourweb2pyapp when you deploy it in GAE. So you new main, and default page will be yourGAEapp.appspot.com/init/default/index
You can pack yourweb2pyapp and then import it as init.
You have to be careful with the internal links.

Is there a way to deploy / update only static content to GAE?

There are many cases in which we run into a need to update only static content of a production GAE app.
Examples:
CSS changes, and other related resources, such as images
New HTML pages, API of the app stays the same (RESTful web services)
Client side flow changes (only JS)
Each of the above changes requires a full deployment.
I read the documentation (Java) and searched this forum (and others), and I'm pretty sure there's no such method exists.
Partial updates of the app in GAE is possible, like updating indexes, update cron jobs, backend management (deploy, start, stop, etc.), but nothing about update static content.
Does anyone know a way for just deploying / updating the static part of a GAE app?
Is this something that folks using GAE would need / use?
Cant be done. File a feature requets!

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