Re^2: How a web server sending data to a CGI perl script ?

[exilepanda]

Um.. Not exactly what I am asking. Say, I fetched a URI from the client wanted "index.pl", then I want to *delegate* the query string , %ENV I've constructed in my server to index.pl for implementation, and I capture the result and return it to the client.

The meaning I said a CGI script don't need to concern... is that a CGI script can always code like this :

#!perl
print "Content-Type: text/html\n\n";
print $ENV{REMOTE_ADDR};

The script don't need to care about the server is IIS or Apache...

[Anonymous Monk]

It is exactly what you're asking. A server implementing CGI uses %ENV to communicate HTTP headers and other basic values (document_root)

STDIN is used for the BODY of the HTTP request

If this doesn't answer your question ... ask a different question please

[exilepanda]

In short, "How"?

I read the RFC recommended,I know what I should prepare (and I already knew) for my script, but the question is how to send it to the script.

Do I send them via a pipe ? or command line with -??? switches, or what ? As far as web servers I've explored, I notice the only thing that need to tell the server is where the interpreter is (, and associate the application/type with file name extension). So what's the magic between ?

[Corion]

As you've read the RFC, maybe you can tell us what parts of chapter 3, Invoking the Script you've already implemented, and where your server still fails.

Update: Chapter 4.1, Request Meta-Variables tells me:

Meta-variables contain data about the request passed from the server to the script, and are accessed by the script in a system-defined manner.

The traditional system-defined manner is using the environment (%ENV) to pass these values. See also chapter 7, which discusses the different operating systems and their system-defined ways of communicating the variables to the child process.

[Anonymous Monk]

I read the RFC recommended,I know what I should prepare (and I already knew) for my script, but the question is how to send it to the script.

client makes a request through socket , your server reads headers, then

Populate a local %ENV

dispatches/calls/invokes a process ,

through pipe, fork, whatever, see perlipc, Capture::Tiny

put http request BODY on STDIN

Collect output from STDOUT

log errors from STDERR

After timeout, or whatever, return/generate/forward a return HTTP request back on socket to the client

I already linked examples in Re: How a web server sending data to a CGI perl script ?