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When a request is received by the server for CGI, the parameters it receives are through QUERY_STRING environment variable. So QUERY_STRING is the environment variable for a server and when a request is received, it holds the string that comes with that request. Now, if a second request comes in...

Picture , video, sound are binary files. Because internet isnt capable of directly handling binary files in e-mail the file is first encoded in one of variety iof encoding schemes and this file is received as an attachment. Question is, what kind of file is email itself. Since message is all...

When a web server receives an HTTP request directed to CGI script, it reads the headers and passes the content body of message to CGI script on STDIN." To pass a parameter from cmd line, we use <stdin>. In the cgi script, I did not use <stdin> anywhere in the script, so how will parameter be...

http://localhost/cgi-bin/server_info.cgi When a web server(apache on my local m/c), receives this request, it reads the HTTP headers and passes content body of message to CGI. In a request, when do we send any content ? we just type the web address and send the request. Does it refer to form...

Does CGI reside outside the web server ? Is CGI invoked on anywhere else than web server ? If CGI is on web server in /cgi-bin directory. So whenevr a CGI is invoked, it is processed on web server only and output is on web server only. So where is the question of sending output to web server ...

I have CGI on Apache server. When a request comes in for this CGI, server invokes CGI and output is sent back to the client. When I was reading book on CGI, this sentence I could not understand. "Once CGI program starts running, it sends its output back to the web server via standard output."...