This article provides an in-depth look at the Wireless Application Protocol (WAP), a standard technology that allows mobile phones to connect to the internet and access simplified web pages and services. It also explores why WAP is necessary, how to incorporate it into existing websites, and the benefits of choosing WAP.
The Wireless Application Protocol (WAP) is a standard technology that allows mobile phones to connect to the internet and access simplified web pages and services. WAP operates similarly to the desktop internet, with the mobile phone containing embedded WAP Micro-Browser software capable of displaying Wireless Markup Language (WML). Users input the URL of a WAPSite into the Micro-Browser, which then forwards the request to a WAP Gateway. This gateway, located within the mobile carrier's network, serves as an interface between the phone and the internet. It retrieves WML content from conventional web servers on the internet and returns it to the phone to be displayed by the Micro-Browser.
Is there a need for another markup language? The answer is a resounding yes! Mobile devices and networks have constraints such as low bandwidth, high latency, low memory, and small display capabilities, making conventional internet protocols (HTTP/TCP/IP) unsuitable for use in the wireless environment. It's not feasible to automatically translate HTML designed for a high-resolution monitor onto a three or four-line mobile phone display. WAP provides a standardized method for efficient and reliable access to internet-based information and services via mobile phones.
If you're familiar with HTML, learning WML should be a breeze. There are fewer tags, and most follow HTML conventions. The main differences between developing for the web and WAP are the small screen size, monochrome images only, and slow connection considerations. Well-designed WAP applications provide a simplified web-like experience.
WAP is about providing access to relevant information from any location - news, email, sports results, and banking have all been successfully translated to WAP. WAP provides end-to-end security, making applications such as banking and mobile commerce as safe as conventional e-commerce sites. You can add intelligence to your WAP applications using WMLScript, which is similar to JavaScript.
Just like HTML pages, anyone can write WML content and upload it to a web server. Server-side scripting such as Perl, PHP, ASP, and Java Servlets can all be used to output dynamically created WML content. In many cases, the hard work of creating the backend of the website has already been done, making the WAP conversion a relatively quick and painless process.
The constraints of the WAP environment and the tight syntax of WML can be seen as a blessing in disguise. Developers have much less scope to format the layout of content compared to HTML design, thus reducing deployment time dramatically.
By choosing WAP, you're building applications and services that are accessible across all WAP-enabled phones and mobile networks (GSM, CDMA, TDMA, and 3G in the future). You'll reach a much wider audience as the number of mobile phone users now exceeds that of desktop PC users. WAP is an evolving technology that can mature as the wireless data industry evolves, making it an extremely powerful tool to extend your website's reach beyond the conventional desktop PC.
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