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Professional Development with Web APIs: Google, Ebay, Amazon.Com, Mappoint, Fedex
Why do some libraries cost more than others? I notice some eBooks, Audiobooks and Video Courses are shared by multiple collections? Why is that? Which collection is right for me? Can I get support with courses and content when using my Library subscription? In it, you will, of course, explore several leading Web APIs to learn how you can use them in your applications.
As you will see in the following chapters, most of these leading Web APIs require you to obtain a developer token that must be included in each request. Most Web APIs have a free limited-use license or trial period, and some of them require payment for the service. Most of the Web services available today are based on XML and can, therefore, be called from various platforms.
The focus of this book is primarily on XML Web services. XML stands for extensible Markup Language, which is a text-based markup language. A very simple example of an XML document is shown here. As you can see from the previous code example, this is a contact record with two contacts, John Doe and Jane Doe.
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For each contact, a contact type and a first and last name are specified. All these computers can read it because it is a text file. A very important aspect of communicating with a Web service is how you can physically execute a specified function.
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Web service providers can enable all three methods, but they typically disable one or more that they decide are not appropriate or desirable for various reasons. The fact that vendors support different methods is the subject of much debate. You should, however, understand how to use each method so you can work with the various Web APIs that are available. The methods are introduced here, but I will cover them in greater detail in the chapters that follow. It refers to invoking a Web service using parameters included in a URL.
Suppose you have the following URL:.
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Notice how the first part of the URL contains the traditional domain information. Next, you see the various parameters being passed. These parameters are being passed to an Amazon API currently version 4. The URL includes a parameter for the service being called AWSProductData , the subscription ID your developer token , the operation to perform a search , the search index to use books , and the keywords to search on Denise Gosnell.
You will see examples of this in action throughout the book. Pasting the URL listed previously into a Web browser returns results similar to those shown in Figure Despite the advantages of REST, it also has limitations.
For example, you do not want to use REST when you need to transmit sensitive data because you do not want to include sensitive data in a text URL. It can still be used to update data as long as the values in the URL do not exceed the maximum allowed length. Dim web As New System. Thus, complex types such as datasets, structs, and classes can be used in SOAP communications. SOAP is the primary message format used by the. But there is good news. Visual Studio. NET and the. NET or by using a compiler tool if you are using just the.
It would be impossible for me to thank everyone who made this book possible, but I would like to acknowledge the fine staff at Wiley for their dedication to this project and all he other projects that they work on each day. I would like to offer a special thanks to Chris Webb, my Executive Editor, for all of his input initially on the direction this book should take and for his continued assistance throughout the editorial process.
I also owe a special thanks to Sharon Nash, my Development Editor, for her editorial input that added the finishing touches to my work. A special thanks is also due to Daniel Solin for his technical review of the book and his great feedback. I would like to thank my husband, Jake, and my friends and family, for their continued support of my authoring efforts.
I spend many moments of my spare time working on new books, and without your patience and understanding, this would not be possible. Thanks to Carl and Leona Stapel of Oshkosh, Wisconsin, for showing me and my husband the world through our many travels with you. I have gained a much broader perspective in our travels, and that has made me a better person and author.
And last, but not least, I thank God for giving me the talent, energy, and positive attitude that allow me to pursue my dreams.
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Should the Features Be Free or for a Fee? Web APIs and Web services are finally getting real attention in the mainstream. Most of these companies offer a free account for limited use of their Web APIs, but some charge a fee for certain levels of usage. If you like the idea of generating applications that capitalize on the services of some of these wellknown companies, or if you just want to learn from what these leading companies are doing to aid you in implementing your own Web APIs, then this is the book for you. However, the book also provides general explanations that will be useful for people who are familiar with other languages.
Thus, prior. NET development experience is not required, but people with prior. NET development experience will find the code examples more familiar and easier to follow.
BOOK: Professional Web APIs: Google, eBay, enhifiter.tk ISBN:
It provides the nutsandbolts details on how several APIs work, and then offers numerous examples of how to use the APIs in real world situations. I came up with a solution that provides a very good balance. The first part of the book is a cookbook of sorts that illustrates how to use various Web APIs. Chapter 1 introduces some general Web API concepts. Each APIspecific chapter is structured in the same fashion and provides the following: 1. Chapter 10 then explores how to create Web APIs from scratch and how to capitalize on that offering. Chapters 11 and 12 are case studies that combine multiple Web APIs in an integrated solution.
For example, the application uses the Google API to retrieve and display the first five sites that mention the particular contact when you open a contact record.
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