Edit some Personal Information about payment gateway

A web browser lets a user request a resource. The web server gets the request, finds the resource, and returns something to the user. Sometimes that resource is an HTML page. Sometimes it’s a picture. Or a sound file. Or even a PDF document. Don’t matter—the client asks for the thing (resource) and the server sends it back. Unless the thing isn’t there. Or at least it’s not where the server is expecting it to be. You’re of course quite familiar with the "404 not found" error—the response you get when the server can’t find what it thinks you asked for. When we say "server", we mean either the physical machine (hardware) or the web server application (software). Throughout the book, if the difference between server hardware and software matters, we’ll explicitly say which one (hardware or software) we’re talking about.

Most of the conversations held on the web of payment gateway between clients and servers are held using the HTTP protocol, which allows for simple request and response conversations. The client sends an HTTP request, and the server answers with an HTTP response. Bottom line: if you’re a web server, you speak HTTP. When a web server sends an HTML page to the client, it sends it using HTTP. (You’ll see the details on how all this works in the next few pages.)(FYI: HTTP stands for Hypertext Transfer Protocol.)When you develop a web page, you use HTML to describe what the page should look like and how it should behave.HTML has dozens of tags and hundreds of tag attributes.

The goal of HTML is to take a text document and add tags that tell the browser how to format the text. Below are the tags we use in the next several chapters. If you need a more complete understanding of HTML, we recommend the book HTML & XHTML the Definitive Guide (O’Reilly).An HTTP response can contain HTML. HTTP adds header information to the top of whatever content is in the response (in other words, the thing coming back from the server). An HTML browser uses that header info to help process online payment the HTML page. Think of the HTML content as data pasted inside an HTTP response. The first thing you’ll find is an HTTP method name.

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