An Introduction to Microservices, Part 3: The Service Registry. In this post in the microservices series we will talk about the service registry. In part 2 we discussed the API gateway, where we mentioned that services are registered in a database. The gateway dispatches requests according to the information contained in that database. Below we will explore how that database is populated and in which way services, clients and the gateway interact with it. The service registry The service registry is a database populated with information on how to dispatch requests to microservice instances. Interactions between microservices and the registry (registration) Self-registrationThird-party registrationInteractions between clients and the registry (discovery) Client-side discoveryServer-side discovery Registration Most microservice-based architectures are in constant evolution.
Self-registration forces microservices to interact with the registry by themselves. Third-party registration is normally used in the industry. Discovery Example: A registry service. Offline Web Applications. You are here: Home Dive Into HTML5 Diving In What is an offline web application? At first glance, it sounds like a contradiction in terms. Web pages are things you download and render. Downloading implies a network connection. How can you download when you’re offline? At its simplest, an offline web application is a list of URLs — HTML, CSS, JavaScript, images, or any other kind of resource. From there, most of the work is up to you, the web developer. The Cache Manifest An offline web application revolves around a cache manifest file. <! Your cache manifest file can be located anywhere on your web server, but it must be served with the content type text/cache-manifest.
AddType text/cache-manifest .manifest Then make sure that the name of your cache manifest file ends with .manifest. Ask Professor Markup Q: My web application spans more than one page. The first line of every cache manifest file is this: Here is a valid manifest file. CACHE MANIFEST /clock.css /clock.js /clock-face.jpg. Firebase - Build Realtime Apps. Feedback & Online Help Desk Software | UserVoice. HTML5 Rocks - A resource for open web HTML5 developers. CSS reference - CSS. Style-rule ::= selectors-list { properties-list } ... where : selectors-list ::= selector[:pseudo-class] [::pseudo-element] [, selectors-list] properties-list ::= [property : value] [; properties-list] See the index of selectors, pseudo-classes, and pseudo-elements below.
The syntax for each specified value depends on the data type defined for each specified property. Style rule examples For a beginner-level introduction to the syntax of selectors, see our guide on CSS Selectors. HTML Reference. AngularJS — Superheroic JavaScript MVW Framework.