By Shishir Gundavaram
The realm broad net is greater than a spot to place up smart records and lovely images. utilizing the typical Gateway Interface (CGI), you could provide interactive queries and serve immediate info from databases, labored up into colourful pics. This e-book bargains a finished clarification of CGI and comparable concepts for those that carry directly to the dream of offering their very own info servers on the internet. the writer starts off before everything, explaining the worth of CGI and the way it really works, then strikes speedily into the delicate info of programming. nearly all of examples use the most typical platform (UNIX) and the most well-liked language (Perl) used for CGI programming this day. although, the booklet additionally introduces the necessities of making CGI paintings with different structures and languages.
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A status value of 200 indicates success, while a value of 400 constitutes a bad request. In addition to these two, there are numerous other status codes you can use for a variety of situations, ranging from an unauthorized or forbidden request to internal system errors. 3 shows a list of some of commonly used status codes. html Unfortunately, most browsers do not support all of them. /usr/local/bin/perl print "Content-type: text/plain", "\n"; print "Status: 204 No Response", "\n\n"; print "You should not see this message.
It is not displayed by the browser, but is used to label the data when transferred to the CGI program. For example, the first input field has a NAME="user" attribute. If someone types "andy" into the first input field, then part of the data sent by the browser will read: user=andy The CGI program can later retrieve this information (as we talked about briefly in Chapter 2, Input to the Common Gateway Interface, and will discuss in more detail later in this chapter) and parse it as needed. The optional VALUE attribute can be used to insert an initial "default" value into the field.
But as we mentioned in Chapter 1 CGI programs can override the header information generated by the server by generating a complete HTTP header on its own. Why go to all the trouble of generating your own header? When your program returns a complete HTTP header, there is no extra overhead incurred by the server. 2. This may mean faster response time for the user. However, it also means you need to be especially careful when generating your own headers, since the server won't be able to circumvent any errors.