The SMTP Service

You could start immediately using the SMTP service if an administrator has set it up for you. However, even so, I think it is necessary to give you some background information for the road ahead because the SMTP service and setting it up correctly is a major source of pain for beginners. Therefore, I start out with the technical details an how email is sent across the Internet.
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Retrieve HTTP Headers

HTTP headers field allowed the client to pass additional information about the request, and about the client itself, to the server. This is how the browser tells the server its name and version, the user’s preferred language, the problem on which it is running, the file types it accepts, and the preceded the requested Web page Which headers are sent vares from browser to browser. How ever, the discussed in the section are supported by most browsers.

Find Out the Length of Posted Content

In case you want to know whether any content was submitting from the client by the post method, you must read the value from the environment variable CONTENT_LENGTH. (The post method is described in detail in the section “Using the post method”)

nContentLength = Request.Servariables (“CONTNET_LENGTH”)

Using the Virtual Path of the Script

The virtual path to the script being executed is used for self-referencing Web page. In case you want to make sure that form is submitting to the Web page itself, no matter which virtual path the Web page has, you should request the server environment variable

SCRIPT_NAME

StrselfURL = Request.serverViriables (“SCIPRT_NAME”)

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Retrieving Environment Variables

Sometimes, you come to a point in your server script development work when you want to find out the browser type. The IP address of the user, some HTTP headers that are delivered from the client or the version of the server software, and where your script is running. For all these demands, you can use the server variables collection of the request object.

Although the most important environment variables are described in this hour’s lesson, it is a good idea to look in the product documentation on the Internet Information of the internet Server (IIS) to get an overview of all possible parameters that can be used to retrieve environment variables. You can read the documentation by calling the address

http:// location/iisHelp/iis/misc/default.asp in the Internet Explorer.

Retrieving Information from the User

Now that you have learned how to send data from the server to the client in Hour 4, “Sending Data to the User” it is time to learn about retrieving data that is sent from the client to the server by submitting a from.

Have you ever wondered how an inquiry to a search engine is handled by the browser or the server and how the data is transferred over the Internet using the Hypertext Transfer Protocol (HTTP)? These lessons provide some answer to these questions and enable you to handle inquiries to your sites by retrieving and evaluating user input.