Web services use SOAP, WSDL, and UDDI. SOAP defines an envelope structure for messages. WSDL describes a service's operations, messages, and location. UDDI allows services to publish themselves so they can be discovered. The document discusses these technologies and how they enable interoperable machine-to-machine communication over the web.
AJAX allows for asynchronous data retrieval and updating of parts of a web page without reloading the entire page. It uses a combination of technologies including XML, JavaScript, CSS, HTML and the XMLHttpRequest object. The XMLHttpRequest object makes asynchronous HTTP requests to the server in the background and retrieves data from the server. This allows updating parts of the web page without interrupting the user's operation.
The document provides an introduction to web APIs and REST. It defines APIs as methods to access data and workflows from an application without using the application itself. It describes REST as an architectural style for APIs that uses a client-server model with stateless operations and a uniform interface. The document outlines best practices for REST APIs, including using HTTP verbs like GET, POST, PUT and DELETE to perform CRUD operations on resources identified by URIs. It also discusses authentication, authorization, security concerns and gives examples of popular REST APIs from Facebook, Twitter and other services.
HTTP Request Smuggling via higher HTTP versionsneexemil
This document summarizes HTTP request smuggling vulnerabilities. It explains how an attacker can craft a single HTTP request that is parsed differently by the frontend and backend servers, allowing the backend to interpret additional hidden requests. Several exploitation techniques and detection methods are described, including issues that can arise with HTTP/1, HTTP/2, and protocols like WebSockets. Automated testing tools have been developed but further research is still needed to fully understand and prevent these attacks.
Over 200 Pages of resources and code snippets to learn JavaScript and JavaScript DOM manipulation. JavaScript is the most popular web programming language and this eBook will help you learn more about JavaScript Coding
AJAX allows asynchronous data retrieval from a server without page refreshes. It uses XMLHttpRequest objects in JavaScript to make requests to the server and update parts of the page without reloading. Common uses of AJAX include Gmail, Google Maps, and Flickr. It provides a faster and more responsive web experience compared to traditional page loads. Frameworks like AJAX.NET help implement AJAX functionality on both the client-side and server-side.
This document provides an introduction to Node.js, Express, and MongoDB. Node.js is a JavaScript runtime built on Chrome's V8 engine that allows JavaScript to be run on the server-side. Express is a web application framework for Node.js that provides routing capabilities and middleware support. MongoDB is a non-relational database that stores data in flexible, JSON-like documents, rather than using rigid tables. The document discusses the pros and cons of each technology and provides examples of basic usage and configuration.
A REST API uses HTTP requests with verbs like GET, POST, PUT, and DELETE to perform CRUD (Create, Read, Update, Delete) operations on resources identified by URLs. It provides a lightweight alternative to SOAP that returns data in JSON format and HTTP response codes. Well-known codes include 200 for OK, 201 for Created, 400 for Bad Request, and 404 for Not Found. REST enables building applications and platforms that can easily integrate new interfaces over time.
JavaScript is a scripting language originally designed for web browsers but now used everywhere. It has dynamic typing and supports object-oriented, imperative, and functional programming. JavaScript was created in 1995 and standardized in 1999. It is now the most popular language on GitHub. JavaScript can be used to build interactive web pages, desktop applications, server-side applications, IoT applications, and real-time applications. The core data types in JavaScript are Number, String, Boolean, Object, Function, Array, Date, and Regular Expressions. JavaScript supports features like variables, flow control, error handling, debugging, and JSON for data exchange.
This document provides an overview of ASP.NET Web API, a framework for building RESTful web services. It discusses key REST concepts like URIs, HTTP verbs, and HATEOAS. It also compares Web API to other technologies like WCF and SOAP, noting advantages of REST such as simpler CRUD operations and standardized development methodology. The document recommends resources like a book on building REST services from start to finish with ASP.NET MVC 4 and Web API.
Cookies and sessions allow servers to store and retrieve information about users across multiple page requests that would otherwise be stateless. Cookies store data in the user's browser, while sessions store data on the server. Cookies have limits on size and number, while sessions can store larger objects but expire when the browser closes. PHP provides functions like setcookie() and $_SESSION to easily manage cookies and sessions for maintaining state in web applications.
- Axios is a JavaScript library that allows you to make HTTP requests from node.js or XMLHttpRequests in the browser. It supports making requests, intercepting requests and responses, and transforming data.
- To use Axios with React, it must be installed via npm, yarn, or by including it from a CDN. Common installation commands are provided.
- The response and error objects returned from Axios requests contain useful information like the data, status code, headers, and original request configuration.
This document discusses HTTP request smuggling vulnerabilities. It begins with an introduction and overview of what will be covered. It then explains where the vulnerability lies in potential desynchronization between how a front-end server and back-end server determine the end of a request. Several examples of different types of desynchronization are provided, including using different content length and transfer encoding headers. Exploitation scenarios and prevention methods are also summarized.
JavaScript is a scripting language used to make web pages interactive. It was created in 1995 and standardized as ECMAScript. JavaScript can access and modify the content, structure, and style of documents. It is used to handle events, perform animations, and interact with forms on web pages. Common uses of JavaScript include form validation, navigation menus, lightboxes, and sliders on websites.
Understanding REST APIs in 5 Simple StepsTessa Mero
This document summarizes the 5 steps to understanding REST APIs: 1) Understanding the purpose of APIs and their importance and growth, 2) Learning that REST defines functions to communicate via HTTP verbs and nouns, 3) Knowing that APIs use requests and responses, 4) Relying on documentation as the reference, and 5) Using debugging and testing tools to prevent issues. It provides examples of requests, responses, API documentation, and tools like Postman for working with REST APIs.
Web service API opens new possibilities to extend websites/web applications including mobile applications, third parties services, etc. We will design a web service API from scratch and review best practices and common mistakes.
Using Communication and Messaging API in the HTML5 WorldGil Fink
This document discusses HTML5 communication and messaging APIs, including cross-document messaging, CORS, server-sent events, and web sockets. Cross-document messaging allows sending messages between windows using postMessage. CORS enables cross-domain requests if responses include access control headers. Server-sent events allow push data from servers to clients. Web sockets provide bidirectional communications over a single TCP connection. The session explored examples of these APIs and their browser support.
This document provides an introduction to the World Wide Web by outlining topics like the history of the Internet, how HTTP works, and the basics of HTML markup. It discusses the evolution of ARPANET into the Internet, how IP addresses map to domain names, and what occurs when a web page is requested. The document also defines HTTP, describes HTTP requests and responses, lists common status codes and headers, and explains how cookies allow servers to maintain state. Finally, it gives a brief overview of HTML structure and tags and indicates PHP and additional topics will be covered next.
This document discusses how exposing low-level capabilities of the web platform can allow developers to extend it forward. It argues that technologies like ServiceWorker, Fetch, Cache, and others provide low-level APIs that explain existing features like HTML and CSS. This allows authors to understand and replicate them. It provides examples of how these low-level APIs can be used for offline applications and beyond. The document advocates wrapping these APIs in new libraries and frameworks to build the next generation of the web.
2014 database - course 1 - www introductionHung-yu Lin
This document provides an introduction to HTML, HTTP protocols, and how to build a basic web server. It begins with an overview of what happens when a browser opens a URL, including DNS lookup and the HTTP request. It then discusses the HTTP protocol and how GET, POST, PUT, and DELETE map to CRUD operations and REST APIs. The document explains how to parse an HTTP request and handle responses in a simple web server. It also introduces CGI as a way to execute scripts or programs on the server side. Finally, it provides recommendations for text editors and references for HTML, CSS, JavaScript, and building websites.
The document discusses the need for web servers to provide various web services for a company. It provides an overview of the history and development of the World Wide Web and web servers. It then describes key features and functions of the Apache web server, including caching, logging, mapping URLs to files, access control, server-side includes, and virtual hosting.
JavaScript Service Worker Design Patterns for Better User Experiencereeder29
Not just for offline, JavaScript Service Workers give your web app a snappy response and predictable behavior. Your web app “feels like an app” to your more-satisfied users and stakeholders.
Phone Home: A client-side error collection systemChris Birchall
This document summarizes Phone Home, a system to collect client-side errors from users' browsers. The Phone Home client runs JavaScript in users' browsers to collect errors and send them via HTTP POST requests to the Phone Home server. The server is built with Scalatra and saves the error data to MongoDB. It was created to debug unreproducible jQuery errors in IE browsers. Features include error handling, page load timing collection, custom field support, and an admin UI with stats and a recent events list. The server uses CORS to allow cross-domain requests from the Phone Home client. Data can also be analyzed using the ltsv4s library to parse and query the log files in Scala.
This document provides an overview of internet engineering and web servers. It begins with an introduction to why companies need web services like hosting applications and websites. It then discusses the history and development of the World Wide Web and how it has grown. The document defines web servers and common features like handling HTTP requests. It covers specifics of HTTP 1.1 servers and the first web server. It also discusses the most popular web servers today like Apache and provides statistics on their usage. Finally, it provides a detailed overview of Apache web server features and functions such as caching, access control, and virtual hosting.
This document discusses methods for enabling cross-domain communication in JavaScript. It begins by explaining the need for cross-domain communication to access third-party APIs and the browser's same-origin policy security restriction. It then describes several approaches for implementing cross-domain communication including using iframes, the postMessage API for cross-window messaging, server-side proxies, JSONP, and the CORS HTTP header for enabling cross-origin requests directly in JavaScript.
Walks through the basics of the HTTP protocol, URLs, cookies and caching, with tricks and tips that can be used by web developers. From a Geek.class I did on Oct 6, 2011 for Meet the Geeks.
- CORS (Cross-Origin Resource Sharing) allows resources on a web page to be requested from another domain outside the domain from which the first resource was served.
- CORS uses additional HTTP headers to tell browsers to give a web application running at one origin access to selected resources from a different origin.
- Developer mistakes can lead to security vulnerabilities like cross-site request forgery if CORS is not implemented correctly, such as specifying '*' for allowed origins, failing to validate origins, or not handling credentials properly.
Come learn about of the flagship features of CommandBox Pro. CommandBox Multi-site allows you to completely replace your web server with CommandBox, hosting multiple websites all in a single process. Each site has its own web root, rewrites, logs, configuration, and HTTP bindings! This is a major new enhancement to CommandBox servers and finally bring CommandBox on par with other web servers and allows you to simplify your entire tech stack down to a single moving part for deployment.
Building Lightning Fast Websites (for Twin Cities .NET User Group)strommen
1. A website is loaded by a browser through a multi-step process involving DNS lookups, TCP connections, downloading resources like HTML, CSS, JS, and images. This process can be slow due to the number of individual requests and dependencies between resources.
2. Ways to optimize the loading process include making the server fast, inlining critical resources, gzip compression, an optimized caching strategy, optimizing file delivery through techniques like CDNs and HTTP/2, bundling resources, optimizing images, avoiding unnecessary domains, minimizing web fonts, and JavaScript techniques like PJAX. Minifying assets can also speed up loading.
WebSockets allow for bidirectional communication between a client and server over a single TCP connection. They improve on older "Comet" techniques which used polling and long-polling to simulate real-time updates. With WebSockets, the client can open a WebSocket connection to the server which sends messages at any time without needing an explicit request. This enables real-time applications with constantly updating information. The document outlines the WebSocket protocol, provides examples of the API in browsers, and discusses frameworks for building WebSocket applications.
Top 10 HTML5 Features for Oracle Cloud DevelopersBrian Huff
This document discusses top HTML5 features for Oracle Cloud developers. It begins with an introduction to various Oracle Cloud services that use HTML5 extensively, such as Oracle Sites Cloud Service. It then discusses why HTML5 is important for cloud development due to its wide acceptance, rapid development cycles, and cheaper hosting model. The document outlines the top 10 HTML5 features developers should know, including semantic HTML, local storage, geolocation, OAuth2, CORS, advanced forms, WebSockets, WebWorkers, built-in audio/video support, and custom DOM elements. It provides details and examples for each feature.
Kiến trúc phần mềm cho các site chịu tải lớn – Software architecture for high traffic Website
Case study giới thiệu về kiến trúc của một site traffic lớn đó là stackoverflow.com - trang hỏi đáp về lập trình rất nổi tiếng
Bài trình bày của bạn Ngô Xuân Hòa tại Meetup 4 của Ha Noi .NET Group.
Chi tiết vui lòng xem tại: http://tungnt.net
HTTP / 1, HTTP / 2 and HTTP / 3: Past, present and the future of APIsRoan Brasil Monteiro
The document provides an overview of the history and evolution of HTTP protocols, from versions 0.9 to 3. It discusses key aspects of HTTP/1.1 including resources, client-server architecture, status codes, and REST. HTTP/2 improvements like multiplexing and binary format are covered. Emerging technologies like GRPC, RSocket, and HTTP/3 which uses QUIC are also summarized. The future of application programming interfaces and network communication is moving towards lower latency protocols built on top of HTTP like HTTP/3 that leverage UDP.
The document discusses JAX-RS (JSR-311), which is a Java API for RESTful web services. It aims to make it easy to build RESTful web services and clients using plain Java objects and annotations. Key points covered include:
- JAX-RS uses annotations to map Java methods to HTTP methods and URI paths.
- It supports common features like URI templates, content negotiation, cookies and headers.
- Providers are used to bridge between HTTP requests/responses and Java objects.
- Annotations like @Produces specify the media types a resource can generate.
Полезна криптография за уеб и мобилни разработчици - това ще бъде една от темите на ТърновоКонф утре. Без да се задълбаваме в теория, ще разгледаме основните крипто инструменти - хеш, HMAC, подпис и (а)симетричен тайнопис и техни практични приложения като верификация на потребители, single-sign on, CSRF защита, автентикация към уеб интерфейси и прочие :)
1. The document contrasts different systems for creating and allocating money: debt-based money created by commercial banks through lending (the current system), finite cryptocurrencies like Bitcoin, and Positive Money where new money is created by a central authority and granted rather than lent into existence.
2. Under Positive Money, an expert committee would track GDP and recommend how much new money is needed to match economic growth, which would be created by the central bank and allocated by government for purposes like reducing taxes or debt.
3. Commercial banks would still exist but could no longer create new money through lending, addressing issues like bubbles and ensuring benefits of money creation accrue to society rather than banks.
Как да контролираме достъпа до web API и други защитени ресурси посредством OAuth 2.0, и как да идентифицираме потребители с OpenID Connect. Лекцията е предназначена за уеб архитекти и програмисти, както и за всички разработчици, които искат да научат повече за новите уеб протоколи за авторизация и автентикация.
JWT (JSON Web Token) is a compact, URL-safe means of representing claims to be transferred between two parties. JWTs can be signed to provide proof of authenticity and integrity, and encrypted to provide confidentiality. A JWT typically contains header, payload, and signature. The payload holds claims about an entity and is digitally signed to protect integrity. JWTs can be passed in HTML and HTTP environments and used from lightweight clients.
Plovdev 2013: How to be a better programmer, beyond programmingVladimir Dzhuvinov
This document contains notes from a presentation or lecture on software engineering best practices and overcoming cognitive biases. It discusses the importance of collaboration, observing other successful programmers, reframing mistakes as learning opportunities, and challenging limiting beliefs. Completing an entire software project from start to finish is recommended to gain experience with the full development cycle. Cognitive biases that can hinder progress are identified, like the need to be perfect or see errors as failures rather than useful feedback. Reframing thought patterns and embracing challenges can help create innovative solutions outside of existing models.
Binding components, events + data sources in HTML + JSVladimir Dzhuvinov
The document discusses component and data binding in Beer.js. It describes two types of binding: 1) Component bindings that encapsulate groups of HTML tags and provide higher-level behavior. 2) Data binding that provides automatic updates from the controller to the model and from the model to the view. It provides an example of a <moneybox> component that can be used to display currency values and interacted with via JavaScript methods to set properties like currency, amount, and refresh interval. The component allows linking views to models declaratively in HTML for more structure and less complex code.
The advent of social media has revolutionized communication, transforming the way people connect, share, and interact globally. At the forefront of this digital revolution are visionary entrepreneurs who recognized the potential of the internet to foster social connections and create communities. This essay explores the founders of some of the most influential social media platforms, their journeys, and the lasting impact they have made on society.
Mark Zuckerberg, along with his college roommates Eduardo Saverin, Andrew McCollum, Dustin Moskovitz, and Chris Hughes, founded Facebook in 2004. Initially created as a social networking site for Harvard University students, Facebook rapidly expanded to other universities and eventually to the general public. Zuckerberg's vision was to create an online directory that connected people through their real-life social networks.
Twitter, founded in 2006 by Jack Dorsey, Biz Stone, and Evan Williams, brought a new dimension to social media with its microblogging platform. Dorsey envisioned a service that allowed users to share short, real-time updates, limited to 140 characters (now 280). This concise format encouraged rapid sharing of information and fostered a culture of brevity and immediacy.
Kevin Systrom and Mike Krieger co-founded Instagram in 2010, focusing on photo and video sharing. Systrom, who studied photography, wanted to create an app that made mobile photos look professional. The app's unique filters and easy-to-use interface quickly gained popularity, amassing over a million users within two months of its launch.
Instagram's emphasis on visual content has had a significant cultural impact. It has popularized the concept of influencers, giving rise to a new industry where individuals can monetize their popularity and reach. The platform has also revolutionized digital marketing, enabling brands to connect with consumers in more authentic and engaging ways. Acquired by Facebook in 2012, Instagram continues to be a dominant force in social media, shaping trends and cultural norms.
Reid Hoffman founded LinkedIn in 2002 with the goal of creating a professional networking platform. Unlike other social media sites focused on personal connections, LinkedIn was designed to connect professionals, facilitate job searches, and foster business relationships. The platform allows users to create professional profiles, network with colleagues, and share industry insights.
LinkedIn has become an indispensable tool for job seekers, recruiters, and businesses. It has transformed the job market by making it easier to find and connect with potential employers and employees. LinkedIn's influence extends beyond job searches; it has become a hub for professional development, thought leadership, and industry news. Hoffman's vision has significantly impacted how professionals manage their careers and build their networks.
Jan Koum and Brian Acton co-founded WhatsApp in 2009, aiming to create a simple, reliable..
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Have you ever built a sandcastle at the beach, only to see it crumble when the tide comes in? In the digital world, our information is like that sandcastle, constantly under threat from waves of cyberattacks. A cybersecurity course is like learning to build a fortress for your information!
This course will teach you how to protect yourself from sneaky online characters who might try to steal your passwords, photos, or even mess with your computer. You'll learn about things like:
* **Spotting online traps:** Phishing emails that look real but could steal your info, and websites that might be hiding malware (like tiny digital monsters).
* **Building strong defenses:** Creating powerful passwords and keeping your software up-to-date, like putting a big, strong lock on your digital door.
* **Fighting back (safely):** Learning how to identify and avoid threats, and what to do if something does go wrong.
By the end of this course, you'll be a cybersecurity champion, ready to defend your digital world and keep your information safe and sound!
2. History
● 1989 The web and HTTP get invented
● 1994 Netscape Navigator
● 1995 JavaScript
● 1999 IE 5 brings XMLHttpRequest
● 2000+ The web becomes dynamic :-)
3. Dynamic web 2.0 vs
same origin policy
Browser
* renders HTML
* executes JS
HTTP server
(the origin)
http://alice.org
Web Service
http://bob.com
serves HTML page
XHR allowed XHR denied
4. The future of the web is
cross-domain, not same origin
5. The first approach at solving
the cross-domain problem
● JSONp
● Ugly hack
● Relies on dynamic
loading of <script> tags
from servers that are not
on the same domain
6. What web gurus decided to do
● Create a new standard protocol for cross-domain
XHR:
– Define origin: RFC 6454
– Define cross-domain requests: W3C Cross-Origin
Resource Sharing (CORS)
– Extend existing XMLHttpRequest object
● A 9 year effort!
8. The web origin concept
Examples of same origin:
http://hackafe.org:8080/files/hello-world?q=123
ORIGIN
Defined in RFC 6454,
published 2011,
by Adam Barth / Google
Defined by matching:
* schema
* host
* port
http://hackafe.org:8080/files/hello-world
http://hackafe.org:8080/files/
http://hackafe.org:8080
9. For CORS to work HTTP
servers must opt-in
CORS
web service
http://bob.com
Browser
* script XHR
“Yes, I'm willing to
serve CORS
requests!”
10. Simple CORS request
● Methods:
– GET
– HEAD
– POST
● Request headers:
– Accept
– Accept-Language
– Content-Language
– Content-Type:
● text/plain
● application/x-www-form-urlencoded
● multipart/form-data
11. Simple CORS request
1. JS originating from http://alice.org:
var client = new XMLHttpRequest()
client.open("GET", "http://bob.com/hello")
client.onreadystatechange = function() { /* do something */ }
client.send()
2. HTTP Request browser → CORS server:
GET /hello HTTP/1.1
Host: http://bob.com
Origin: http://alice.org
3. HTTP Response CORS server → browser:
HTTP/1.1 200 OK
Access-Control-Allow-Origin: http://alice.org
Content-Type: text/plain
Hello world!
12. Preflight request
● For methods other than GET, HEAD and POST
● For credentials, such as cookies, HTTP basic
and tokens
● For request headers such as Content-Type:
application/json
● To expose non-simple response headers to the
JavaScript, e.g. X-Custom-Header
13. Preflight request with HTTP
OPTIONS
1. HTTP Request browser → CORS server:
OPTIONS /hello HTTP/1.1
Host: http://bob.com
Origin: http://alice.org
Access-Control-Request-Method: PUT
Access-Control-Request-Headers: Content-Type, Authorization
2. HTTP Response CORS server → browser:
HTTP/1.1 200 OK
Access-Control-Allow-Origin: http://alice.org
Access-Control-Allow-Methods: GET, POST, PUT, DELETE
Access-Control-Allow-Headers: Content-Type, Authorization
Access-Control-Expose-Headers: X-Custom-Header
Access-Control-Allow-Credentials: true
Access-Control-Max-Age: 3600
14. Handling CORS on the server side
Servlets
CORS Filter Cross-origin
resources
Java Web Server
Incoming HTTP
requests
JSP
Static files
http://software.dzhuvinov.com/cors-filter.html
You don't need to code anything, use
existing CORS filters or modules
15. How to detect CORS support
in the browser
function browserSupportsCors() {
if ("withCredentials" in new XMLHttpRequest())
return true;
else if (typeof XDomainRequest == "object")
return true;
else
return false;
}