Cross Site Scripting

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XSS Attacks

Author : Seth Fogie,Jeremiah Grossman,Robert Hansen,Anton Rager,Petko D. Petkov
Publisher : Elsevier
Page : 479 pages
File Size : 48,8 Mb
Release : 2011-04-18
Category : Computers
ISBN : 9780080553405

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XSS Attacks by Seth Fogie,Jeremiah Grossman,Robert Hansen,Anton Rager,Petko D. Petkov Pdf

A cross site scripting attack is a very specific type of attack on a web application. It is used by hackers to mimic real sites and fool people into providing personal data. XSS Attacks starts by defining the terms and laying out the ground work. It assumes that the reader is familiar with basic web programming (HTML) and JavaScript. First it discusses the concepts, methodology, and technology that makes XSS a valid concern. It then moves into the various types of XSS attacks, how they are implemented, used, and abused. After XSS is thoroughly explored, the next part provides examples of XSS malware and demonstrates real cases where XSS is a dangerous risk that exposes internet users to remote access, sensitive data theft, and monetary losses. Finally, the book closes by examining the ways developers can avoid XSS vulnerabilities in their web applications, and how users can avoid becoming a victim. The audience is web developers, security practitioners, and managers. XSS Vulnerabilities exist in 8 out of 10 Web sites The authors of this book are the undisputed industry leading authorities Contains independent, bleeding edge research, code listings and exploits that can not be found anywhere else

Spring 5.0 Cookbook

Author : Sherwin John Calleja Tragura
Publisher : Packt Publishing Ltd
Page : 660 pages
File Size : 54,9 Mb
Release : 2017-09-27
Category : Computers
ISBN : 9781787129689

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Spring 5.0 Cookbook by Sherwin John Calleja Tragura Pdf

Over 100 hands-on recipes to build web applications easily and efficiently IN Spring 5.0 About This Book Solve real-world problems using the latest features of the Spring framework like Reactive Streams and the Functional Web Framework. Learn how to use dependency injection and aspect-oriented programming to write compartmentalized and testable code. Understand when to choose between Spring MVC and Spring Web Reactive for your projects Who This Book Is For Java developers who would like to gain in-depth knowledge of how to overcome problems that they face while developing great Spring applications. It will also cater to Spring enthusiasts, users and experts who need an arena for comparative analysis, new ideas and inquiries on some details regarding Spring 5.0 and its previous releases. A basic knowledge of Spring development is essential What You Will Learn Understand how functional programming and concurrency in JDK 1.9 works, and how it will affect Spring 5.0 Learn the importance and application of reactive programming in creating services, and also the process of creating asynchronous MVC applications Implement different Spring Data modules Integrate Spring Security to the container Create applications and deploy using Spring Boot Conceptualize the architecture behind Microservices and learn the details of its implementation Create different test cases for the components of Spring 5.0 components In Detail The Spring framework has been the go-to framework for Java developers for quite some time. It enhances modularity, provides more readable code, and enables the developer to focus on developing the application while the underlying framework takes care of transaction APIs, remote APIs, JMX APIs, and JMS APIs. The upcoming version of the Spring Framework has a lot to offer, above and beyond the platform upgrade to Java 9, and this book will show you all you need to know to overcome common to advanced problems you might face. Each recipe will showcase some old and new issues and solutions, right from configuring Spring 5.0 container to testing its components. Most importantly, the book will highlight concurrent processes, asynchronous MVC and reactive programming using Reactor Core APIs. Aside from the core components, this book will also include integration of third-party technologies that are mostly needed in building enterprise applications. By the end of the book, the reader will not only be well versed with the essential concepts of Spring, but will also have mastered its latest features in a solution-oriented manner. Style and Approach This book follows a cookbook style approach, presenting a problem and showing you how to overcome it with useful recipes. The examples provided will help you code along as you learn.

Web Security

Author : Hanqing Wu,Liz Zhao
Publisher : CRC Press
Page : 532 pages
File Size : 50,7 Mb
Release : 2015-04-06
Category : Business & Economics
ISBN : 9781466592629

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Web Security by Hanqing Wu,Liz Zhao Pdf

In late 2013, approximately 40 million customer debit and credit cards were leaked in a data breach at Target. This catastrophic event, deemed one of the biggest data breaches ever, clearly showed that many companies need to significantly improve their information security strategies. Web Security: A White Hat Perspective presents a comprehensive guide to web security technology and explains how companies can build a highly effective and sustainable security system. In this book, web security expert Wu Hanqing reveals how hackers work and explains why companies of different scale require different security methodologies. With in-depth analysis of the reasons behind the choices, the book covers client script security, server applications security, and Internet company security operations. It also includes coverage of browser security, cross sites script attacks, click jacking, HTML5/PHP security, injection attacks, authentication, session management, access control, web frame security, DDOS, leaks, Internet transactions security, and the security development lifecycle.

Oracle JET for Developers

Author : Raja Malleswara Rao Pattamsetti
Publisher : Packt Publishing Ltd
Page : 272 pages
File Size : 50,6 Mb
Release : 2017-12-08
Category : Computers
ISBN : 9781787122291

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Oracle JET for Developers by Raja Malleswara Rao Pattamsetti Pdf

Client side JavaScript for enterprise Oracle applications. About This Book Develop resilient and robust client-side applications Explore the power of popular JavaScript libraries such as jQuery, RequireJS, and custom Oracle JavaScript libraries Integrate JavaScript for Oracle developers Easily debug and secure your cloud interfaces Who This Book Is For If you are a web components developer looking to create client-side apps that are resilient and robust using Oracle JET, then this book is the right choice for you. What You Will Learn Use Yeoman or npm to start a new Oracle JET-based project Implement real-world use cases using Oracle JET components Get to know the best practices for Oracle JET web applications Explore Knockout.js, the framework behind Oracle JET Implement a multi-platform app with OJ and Cordova In Detail This book will give you a complete practical understanding of the Oracle JavaScript Extension Toolkit (JET) and how you can use it to develop efficient client-side applications with ease. It will tell you how to get your own customized Oracle JET set up. You'll start with individual libraries, such as jQuery, Cordova, and Require.js. You'll also get to work with the JavaScript libraries created by Oracle, especially for cloud developers. You'll use these tools to create a working backend application with these libraries. Using the latest Oracle Alta UI, you'll develop a state-of-the-art backend for your cloud applications. You'll learn how to develop and integrate the different cloud services required for your application and use other third-party libraries to get more features from your cloud applications. Toward the end of the book, you'll learn how to manage and secure your cloud applications, and test them to ensure seamless deployment. Style and approach This book will have a practical step by step approach where every step of application development will be explained in detail with code samples.

Hacking: The Next Generation

Author : Nitesh Dhanjani,Billy Rios,Brett Hardin
Publisher : "O'Reilly Media, Inc."
Page : 299 pages
File Size : 53,8 Mb
Release : 2009-08-29
Category : Computers
ISBN : 9781449379216

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Hacking: The Next Generation by Nitesh Dhanjani,Billy Rios,Brett Hardin Pdf

With the advent of rich Internet applications, the explosion of social media, and the increased use of powerful cloud computing infrastructures, a new generation of attackers has added cunning new techniques to its arsenal. For anyone involved in defending an application or a network of systems, Hacking: The Next Generation is one of the few books to identify a variety of emerging attack vectors. You'll not only find valuable information on new hacks that attempt to exploit technical flaws, you'll also learn how attackers take advantage of individuals via social networking sites, and abuse vulnerabilities in wireless technologies and cloud infrastructures. Written by seasoned Internet security professionals, this book helps you understand the motives and psychology of hackers behind these attacks, enabling you to better prepare and defend against them. Learn how "inside out" techniques can poke holes into protected networks Understand the new wave of "blended threats" that take advantage of multiple application vulnerabilities to steal corporate data Recognize weaknesses in today's powerful cloud infrastructures and how they can be exploited Prevent attacks against the mobile workforce and their devices containing valuable data Be aware of attacks via social networking sites to obtain confidential information from executives and their assistants Get case studies that show how several layers of vulnerabilities can be used to compromise multinational corporations

Hands-On RESTful API Design Patterns and Best Practices

Author : Harihara Subramanian,Pethuru Raj
Publisher : Packt Publishing Ltd
Page : 365 pages
File Size : 49,8 Mb
Release : 2019-01-31
Category : Computers
ISBN : 9781788998581

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Hands-On RESTful API Design Patterns and Best Practices by Harihara Subramanian,Pethuru Raj Pdf

Build effective RESTful APIs for enterprise with design patterns and REST framework’s out-of-the-box capabilities Key FeaturesUnderstand advanced topics such as API gateways, API securities, and cloudImplement patterns programmatically with easy-to-follow examplesModernize legacy codebase using API connectors, layers, and microservicesBook Description This book deals with the Representational State Transfer (REST) paradigm, which is an architectural style that allows networked devices to communicate with each other over the internet. With the help of this book, you’ll explore the concepts of service-oriented architecture (SOA), event-driven architecture (EDA), and resource-oriented architecture (ROA). This book covers why there is an insistence for high-quality APIs toward enterprise integration. It also covers how to optimize and explore endpoints for microservices with API gateways and touches upon integrated platforms and Hubs for RESTful APIs. You’ll also understand how application delivery and deployments can be simplified and streamlined in the REST world. The book will help you dig deeper into the distinct contributions of RESTful services for IoT analytics and applications. Besides detailing the API design and development aspects, this book will assist you in designing and developing production-ready, testable, sustainable, and enterprise-grade APIs. By the end of the book, you’ll be empowered with all that you need to create highly flexible APIs for next-generation RESTful services and applications. What you will learnExplore RESTful concepts, including URI, HATEOAS, and Code on DemandStudy core patterns like Statelessness, Pagination, and DiscoverabilityOptimize endpoints for linked microservices with API gatewaysDelve into API authentication, authorization, and API security implementationsWork with Service Orchestration to craft composite and process-aware servicesExpose RESTful protocol-based APIs for cloud computingWho this book is for This book is primarily for web, mobile, and cloud services developers, architects, and consultants who want to build well-designed APIs for creating and sustaining enterprise-class applications. You’ll also benefit from this book if you want to understand the finer details of RESTful APIs and their design techniques along with some tricks and tips.

Effective Python Penetration Testing

Author : Rejah Rehim
Publisher : Packt Publishing Ltd
Page : 156 pages
File Size : 54,5 Mb
Release : 2016-06-29
Category : Computers
ISBN : 9781785280962

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Effective Python Penetration Testing by Rejah Rehim Pdf

Pen test your system like a pro and overcome vulnerabilities by leveraging Python scripts, libraries, and tools About This Book Learn to utilize your Python scripting skills to pentest a computer system, network, and web-application Get proficient at the art of assessing vulnerabilities by conducting effective penetration testing This is the ultimate guide that teaches you how to use Python to protect your systems against sophisticated cyber attacks Who This Book Is For This book is ideal for those who are comfortable with Python or a similar language and need no help with basic programming concepts, but want to understand the basics of penetration testing and the problems pentesters face. What You Will Learn Write Scapy scripts to investigate network traffic Get to know application fingerprinting techniques with Python Understand the attack scripting techniques Write fuzzing tools with pentesting requirements Learn basic attack scripting methods Utilize cryptographic toolkits in Python Automate pentesting with Python tools and libraries In Detail Penetration testing is a practice of testing a computer system, network, or web application to find weaknesses in security that an attacker can exploit. Effective Python Penetration Testing will help you utilize your Python scripting skills to safeguard your networks from cyberattacks. We will begin by providing you with an overview of Python scripting and penetration testing. You will learn to analyze network traffic by writing Scapy scripts and will see how to fingerprint web applications with Python libraries such as ProxMon and Spynner. Moving on, you will find out how to write basic attack scripts, and will develop debugging and reverse engineering skills with Python libraries. Toward the end of the book, you will discover how to utilize cryptography toolkits in Python and how to automate Python tools and libraries. Style and approach This is an expert's guide to Python with a practical based approach, where each chapter will help you improve your penetration testing skills using Python to become a master pen tester.

The Web Application Hacker's Handbook

Author : Dafydd Stuttard,Marcus Pinto
Publisher : John Wiley & Sons
Page : 770 pages
File Size : 49,5 Mb
Release : 2011-03-16
Category : Computers
ISBN : 9781118079614

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The Web Application Hacker's Handbook by Dafydd Stuttard,Marcus Pinto Pdf

This book is a practical guide to discovering and exploiting security flaws in web applications. The authors explain each category of vulnerability using real-world examples, screen shots and code extracts. The book is extremely practical in focus, and describes in detail the steps involved in detecting and exploiting each kind of security weakness found within a variety of applications such as online banking, e-commerce and other web applications. The topics covered include bypassing login mechanisms, injecting code, exploiting logic flaws and compromising other users. Because every web application is different, attacking them entails bringing to bear various general principles, techniques and experience in an imaginative way. The most successful hackers go beyond this, and find ways to automate their bespoke attacks. This handbook describes a proven methodology that combines the virtues of human intelligence and computerized brute force, often with devastating results. The authors are professional penetration testers who have been involved in web application security for nearly a decade. They have presented training courses at the Black Hat security conferences throughout the world. Under the alias "PortSwigger", Dafydd developed the popular Burp Suite of web application hack tools.

Bug Bounty Hunting for Web Security

Author : Sanjib Sinha
Publisher : Apress
Page : 232 pages
File Size : 50,7 Mb
Release : 2019-11-12
Category : Computers
ISBN : 9781484253915

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Bug Bounty Hunting for Web Security by Sanjib Sinha Pdf

Start with the basics of bug hunting and learn more about implementing an offensive approach by finding vulnerabilities in web applications. Getting an introduction to Kali Linux, you will take a close look at the types of tools available to you and move on to set up your virtual lab. You will then discover how request forgery injection works on web pages and applications in a mission-critical setup. Moving on to the most challenging task for any web application, you will take a look at how cross-site scripting works and find out about effective ways to exploit it. You will then learn about header injection and URL redirection along with key tips to find vulnerabilities in them. Keeping in mind how attackers can deface your website, you will work with malicious files and automate your approach to defend against these attacks. Moving on to Sender Policy Framework (SPF), you will see tips to find vulnerabilities in it and exploit them. Following this, you will get to know how unintended XML injection and command injection work to keep attackers at bay. Finally, you will examine different attack vectors used to exploit HTML and SQL injection. Overall, Bug Bounty Hunting for Web Security will help you become a better penetration tester and at the same time it will teach you how to earn bounty by hunting bugs in web applications. What You Will Learn Implement an offensive approach to bug hunting Create and manage request forgery on web pages Poison Sender Policy Framework and exploit it Defend against cross-site scripting (XSS) attacks Inject headers and test URL redirection Work with malicious files and command injectionResist strongly unintended XML attacks Who This Book Is For White-hat hacking enthusiasts who are new to bug hunting and are interested in understanding the core concepts.

Alice and Bob Learn Application Security

Author : Tanya Janca
Publisher : John Wiley & Sons
Page : 288 pages
File Size : 54,7 Mb
Release : 2020-11-10
Category : Computers
ISBN : 9781119687351

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Alice and Bob Learn Application Security by Tanya Janca Pdf

Learn application security from the very start, with this comprehensive and approachable guide! Alice and Bob Learn Application Security is an accessible and thorough resource for anyone seeking to incorporate, from the beginning of the System Development Life Cycle, best security practices in software development. This book covers all the basic subjects such as threat modeling and security testing, but also dives deep into more complex and advanced topics for securing modern software systems and architectures. Throughout, the book offers analogies, stories of the characters Alice and Bob, real-life examples, technical explanations and diagrams to ensure maximum clarity of the many abstract and complicated subjects. Topics include: Secure requirements, design, coding, and deployment Security Testing (all forms) Common Pitfalls Application Security Programs Securing Modern Applications Software Developer Security Hygiene Alice and Bob Learn Application Security is perfect for aspiring application security engineers and practicing software developers, as well as software project managers, penetration testers, and chief information security officers who seek to build or improve their application security programs. Alice and Bob Learn Application Security illustrates all the included concepts with easy-to-understand examples and concrete practical applications, furthering the reader's ability to grasp and retain the foundational and advanced topics contained within.

Seven Deadliest Web Application Attacks

Author : Mike Shema
Publisher : Syngress
Page : 187 pages
File Size : 46,6 Mb
Release : 2010-02-20
Category : Business & Economics
ISBN : 9781597495448

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Seven Deadliest Web Application Attacks by Mike Shema Pdf

Seven Deadliest Web Application Attacks highlights the vagaries of web security by discussing the seven deadliest vulnerabilities exploited by attackers. This book pinpoints the most dangerous hacks and exploits specific to web applications, laying out the anatomy of these attacks including how to make your system more secure. You will discover the best ways to defend against these vicious hacks with step-by-step instruction and learn techniques to make your computer and network impenetrable. Each chapter presents examples of different attacks conducted against web sites. The methodology behind the attack is explored, showing its potential impact. The chapter then moves on to address possible countermeasures for different aspects of the attack. The book consists of seven chapters that cover the following: the most pervasive and easily exploited vulnerabilities in web sites and web browsers; Structured Query Language (SQL) injection attacks; mistakes of server administrators that expose the web site to attack; brute force attacks; and logic attacks. The ways in which malicious software malware has been growing as a threat on the Web are also considered. This book is intended for information security professionals of all levels, as well as web application developers and recreational hackers. Knowledge is power, find out about the most dominant attacks currently waging war on computers and networks globally Discover the best ways to defend against these vicious attacks; step-by-step instruction shows you how Institute countermeasures, don’t be caught defenseless again, and learn techniques to make your computer and network impenetrable

Cross-Site Scripting Attacks

Author : B. B. Gupta,Pooja Chaudhary
Publisher : CRC Press
Page : 86 pages
File Size : 47,5 Mb
Release : 2020-02-25
Category : Computers
ISBN : 9781000049862

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Cross-Site Scripting Attacks by B. B. Gupta,Pooja Chaudhary Pdf

Social network usage has increased exponentially in recent years. Platforms like Facebook, Twitter, Google+, LinkedIn and Instagram, not only facilitate sharing of personal data but also connect people professionally. However, development of these platforms with more enhanced features like HTML5, CSS, XHTML and Java Script expose these sites to various vulnerabilities that may be the root cause of various threats. Therefore, social networking sites have become an attack surface for various cyber-attacks such as XSS attack and SQL Injection. Numerous defensive techniques have been proposed, yet with technology up-gradation current scenarios demand for more efficient and robust solutions. Cross-Site Scripting Attacks: Classification, Attack, and Countermeasures is a comprehensive source which provides an overview of web-based vulnerabilities and explores XSS attack in detail. This book provides a detailed overview of the XSS attack; its classification, recent incidences on various web applications, and impacts of the XSS attack on the target victim. This book addresses the main contributions of various researchers in XSS domain. It provides in-depth analysis of these methods along with their comparative study. The main focus is a novel framework which is based on Clustering and Context based sanitization approach to protect against XSS attack on social network. The implementation details conclude that it is an effective technique to thwart XSS attack. The open challenges and future research direction discussed in this book will help further to the academic researchers and industry specific persons in the domain of security.

Mastering Modern Web Penetration Testing

Author : Prakhar Prasad
Publisher : Packt Publishing Ltd
Page : 298 pages
File Size : 44,9 Mb
Release : 2016-10-28
Category : Computers
ISBN : 9781785289149

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Mastering Modern Web Penetration Testing by Prakhar Prasad Pdf

Master the art of conducting modern pen testing attacks and techniques on your web application before the hacker does! About This Book This book covers the latest technologies such as Advance XSS, XSRF, SQL Injection, Web API testing, XML attack vectors, OAuth 2.0 Security, and more involved in today's web applications Penetrate and secure your web application using various techniques Get this comprehensive reference guide that provides advanced tricks and tools of the trade for seasoned penetration testers Who This Book Is For This book is for security professionals and penetration testers who want to speed up their modern web application penetrating testing. It will also benefit those at an intermediate level and web developers who need to be aware of the latest application hacking techniques. What You Will Learn Get to know the new and less-publicized techniques such PHP Object Injection and XML-based vectors Work with different security tools to automate most of the redundant tasks See different kinds of newly-designed security headers and how they help to provide security Exploit and detect different kinds of XSS vulnerabilities Protect your web application using filtering mechanisms Understand old school and classic web hacking in depth using SQL Injection, XSS, and CSRF Grasp XML-related vulnerabilities and attack vectors such as XXE and DoS techniques Get to know how to test REST APIs to discover security issues in them In Detail Web penetration testing is a growing, fast-moving, and absolutely critical field in information security. This book executes modern web application attacks and utilises cutting-edge hacking techniques with an enhanced knowledge of web application security. We will cover web hacking techniques so you can explore the attack vectors during penetration tests. The book encompasses the latest technologies such as OAuth 2.0, Web API testing methodologies and XML vectors used by hackers. Some lesser discussed attack vectors such as RPO (relative path overwrite), DOM clobbering, PHP Object Injection and etc. has been covered in this book. We'll explain various old school techniques in depth such as XSS, CSRF, SQL Injection through the ever-dependable SQLMap and reconnaissance. Websites nowadays provide APIs to allow integration with third party applications, thereby exposing a lot of attack surface, we cover testing of these APIs using real-life examples. This pragmatic guide will be a great benefit and will help you prepare fully secure applications. Style and approach This master-level guide covers various techniques serially. It is power-packed with real-world examples that focus more on the practical aspects of implementing the techniques rather going into detailed theory.

Cross-Site Scripting Attacks

Author : B. B. Gupta,Pooja Chaudhary
Publisher : CRC Press
Page : 144 pages
File Size : 45,7 Mb
Release : 2020-02-25
Category : Computers
ISBN : 9781000049800

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Cross-Site Scripting Attacks by B. B. Gupta,Pooja Chaudhary Pdf

Social network usage has increased exponentially in recent years. Platforms like Facebook, Twitter, Google+, LinkedIn and Instagram, not only facilitate sharing of personal data but also connect people professionally. However, development of these platforms with more enhanced features like HTML5, CSS, XHTML and Java Script expose these sites to various vulnerabilities that may be the root cause of various threats. Therefore, social networking sites have become an attack surface for various cyber-attacks such as XSS attack and SQL Injection. Numerous defensive techniques have been proposed, yet with technology up-gradation current scenarios demand for more efficient and robust solutions. Cross-Site Scripting Attacks: Classification, Attack, and Countermeasures is a comprehensive source which provides an overview of web-based vulnerabilities and explores XSS attack in detail. This book provides a detailed overview of the XSS attack; its classification, recent incidences on various web applications, and impacts of the XSS attack on the target victim. This book addresses the main contributions of various researchers in XSS domain. It provides in-depth analysis of these methods along with their comparative study. The main focus is a novel framework which is based on Clustering and Context based sanitization approach to protect against XSS attack on social network. The implementation details conclude that it is an effective technique to thwart XSS attack. The open challenges and future research direction discussed in this book will help further to the academic researchers and industry specific persons in the domain of security.

Third-Party JavaScript

Author : Ben Vinegar,Anton Kovalyov
Publisher : Simon and Schuster
Page : 408 pages
File Size : 45,7 Mb
Release : 2013-03-10
Category : Computers
ISBN : 9781638352709

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Third-Party JavaScript by Ben Vinegar,Anton Kovalyov Pdf

Summary Third-Party JavaScript guides web developers through the complete development of a full-featured third-party JavaScript application. You'll learn dozens of techniques for developing widgets that collect data for analytics, provide helpful overlays and dialogs, or implement features like chat or commenting. The concepts and examples throughout this book represent the best practices for this emerging field, based on thousands of real-world dev hours and results from millions of users. About this Book There's an art to writing third-party JavaScript—embeddable scripts that can plug into any website. They must adapt easily to unknown host environments, coexist with other applications, and manage the tricky security vulnerabilities you get when code and asset files are served from remote web addresses. Get it right and you have unlimited options for distributing your apps. This unique book shows you how. Third-Party JavaScript guides you through the ins and outs of building full-featured third-party JavaScript applications. You'll learn techniques for developing widgets that collect data for analytics, provide helpful overlays and dialogs, or implement features like chat and commenting. The concepts and examples throughout the book represent the best practices for this emerging field, based on thousands of real-world dev hours and results from millions of users. Written for web developers who know JavaScript, this book requires no prior knowledge of third-party apps. What's Inside Writing conflict-free JavaScript, HTML, and CSS Making cross-domain requests from the browser How to overcome third-party cookie limitations Security vulnerabilities of third-party applications Purchase of the print book includes a free eBook in PDF, Kindle, and ePub formats from Manning Publications. About the Authors Ben Vinegar is an engineer at Disqus, a third-party JavaScript commenting platform. Anton Kovalyov is a software engineer at Mozilla. They are third-party applications experts whose work has been distributed on millions of websites Table of Contents Introduction to third-party JavaScript Distributing and loading your application Rendering HTML and CSS Communicating with the server Cross-domain iframe messaging Authentication and sessions Security Developing a third-party JavaScript SDK Performance Debugging and testing