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Small Web Server in Perl
Writing Your Own Simple Client and Server example from a Well House Consultants training course
More on Writing Your Own Simple Client and Server [link]
Source code: miniserver.pl Module: P402
#!/usr/bin/env perl
use strict; use Socket; use IO::Socket; # Simple web server in Perl # Serves out .html files, echos form data sub parse_form { my $data = $_[0]; my %data; foreach (split /&/, $data) { my ($key, $val) = split /=/; $val =~ s/\+/ /g; $val =~ s/%(..)/chr(hex($1))/eg; $data{$key} = $val;} return %data; } # Setup and create socket my $port = shift; defined($port) or die "Usage: $0 portno\n"; my $DOCUMENT_ROOT = $ENV{'HOME'} . "/public_html"; my $server = new IO::Socket::INET(Proto => 'tcp', LocalPort => $port, Listen => SOMAXCONN, Reuse => 1); $server or die "Unable to create server socket: $!" ; # Await requests and handle them as they arrive while (my $client = $server->accept()) { $client->autoflush(1); my %request = (); my %data; { #-------- Read Request --------------- local $/ = Socket::CRLF; while (<$client>) { chomp; # Main http request if (/\s*(\w+)\s*([^\s]+)\s*HTTP\/(\d.\d)/) { $request{METHOD} = uc $1; $request{URL} = $2; $request{HTTP_VERSION} = $3; } # Standard headers elsif (/:/) { (my $type, my $val) = split /:/, $_, 2; $type =~ s/^\s+//; foreach ($type, $val) { s/^\s+//; s/\s+$//; } $request{lc $type} = $val; } # POST data elsif (/^$/) { read($client, $request{CONTENT}, $request{'content-length'}) if defined $request{'content-length'}; last; } } } #-------- SORT OUT METHOD --------------- if ($request{METHOD} eq 'GET') { if ($request{URL} =~ /(.*)\?(.*)/) { $request{URL} = $1; $request{CONTENT} = $2; %data = parse_form($request{CONTENT}); } else { %data = (); } $data{"_method"} = "GET"; } elsif ($request{METHOD} eq 'POST') { %data = parse_form($request{CONTENT}); $data{"_method"} = "POST"; } else { $data{"_method"} = "ERROR"; } #------- Serve file ---------------------- my $localfile = $DOCUMENT_ROOT.$request{URL}; # Send Response if (open(FILE, "<$localfile")) { print $client "HTTP/1.0 200 OK", Socket::CRLF; print $client "Content-type: text/html", Socket::CRLF; print $client Socket::CRLF; my $buffer; while (read(FILE, $buffer, 4096)) { print $client $buffer; } $data{"_status"} = "200"; } else { print $client "HTTP/1.0 404 Not Found", Socket::CRLF; print $client Socket::CRLF; print $client "<html><body>404 Not Found</body></html>"; $data{"_status"} = "404"; } close(FILE); # Log Request print ($DOCUMENT_ROOT.$request{URL},"\n"); foreach (keys(%data)) { print (" $_ = $data{$_}\n"); } # ----------- Close Connection and loop ------------------ close $client; } __END__ Notes on this Web server in Perl ... Reports all files served as being Text/HTML Uses HTTP/1.0 (so no virtual hosting support) Does not process "home page" requests through to index.html No support for 300 redirects Only GET and POST method supported Standard URL encoding only Single thread / process only If you want a proper web server, use Apache httpd ... but this is great as the basis of an Intranet specialised http handler - for example to act as a data logger with acknowledgements. Learn about this subject
This module and example are covered on our public Using Perl on the Web course. If you have a group of
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Other Examples
This example comes from our "Writing Your Own Simple Client and Server" training module. You'll find a description of the topic and some
other closely related examples on the "Writing Your Own Simple Client and Server" module index page.
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