Hello world/Web server
From Rosetta Code
You are encouraged to solve this task according to the task description, using any language you may know.
The browser is the new GUI!
The task is to serve our standard text "Goodbye, World!" to http://localhost:8080/ so that it can be viewed with a web browser. The provided solution must start or implement a server that accepts multiple client connections and serves text as requested.
Note that starting a web browser or opening a new window with this URL is not part of the task. Additionally, it is permissible to serve the provided page as a plain text file (there is no requirement to serve properly formatted HTML here). The browser will generally do the right thing with simple text like this.
[edit] Ada
Uses many defaults, such as 5 max simultaneous connections.
with AWS; use AWS;
with AWS.Response;
with AWS.Server;
with AWS.Status;
with Ada.Text_IO; use Ada.Text_IO;
procedure HelloHTTP is
function CB (Request : Status.Data) return Response.Data is
pragma Unreferenced (Request);
begin
return Response.Build ("text/html", "Hello world!");
end CB;
TheServer : Server.HTTP;
ch : Character;
begin
Server.Start (TheServer, "Rosettacode",
Callback => CB'Unrestricted_Access, Port => 8080);
Put_Line ("Press any key to quit."); Get_Immediate (ch);
Server.Shutdown (TheServer);
end HelloHTTP;
[edit] AWK
With GNU AWK (gawk) a simple web server can be implemented. The example is taken from here [1] (Documentation is licensed under GNU Free Documentation License, Version 1.3)
#!/usr/bin/gawk -f
BEGIN {
RS = ORS = "\r\n"
HttpService = "/inet/tcp/8080/0/0"
Hello = "<HTML><HEAD>" \
"<TITLE>A Famous Greeting</TITLE></HEAD>" \
"<BODY><H1>Hello, world</H1></BODY></HTML>"
Len = length(Hello) + length(ORS)
print "HTTP/1.0 200 OK" |& HttpService
print "Content-Length: " Len ORS |& HttpService
print Hello |& HttpService
while ((HttpService |& getline) > 0)
continue;
close(HttpService)
}
[edit] BBC BASIC
This explicitly supports multiple concurrent connections.
INSTALL @lib$+"SOCKLIB"
PROC_initsockets
maxSess% = 8
DIM sock%(maxSess%-1), rcvd$(maxSess%-1), Buffer% 255
ON ERROR PRINT REPORT$ : PROC_exitsockets : END
ON CLOSE PROC_exitsockets : QUIT
port$ = "8080"
host$ = FN_gethostname
PRINT "Host name is " host$
listen% = FN_tcplisten(host$, port$)
PRINT "Listening on port ";port$
REPEAT
socket% = FN_check_connection(listen%)
IF socket% THEN
FOR i% = 0 TO maxSess%-1
IF sock%(i%) = 0 THEN
sock%(i%) = socket%
rcvd$(i%) = ""
PRINT "Connection on socket "; sock%(i%) " opened"
EXIT FOR
ENDIF
NEXT i%
listen% = FN_tcplisten(host$, port$)
ENDIF
FOR i% = 0 TO maxSess%-1
IF sock%(i%) THEN
res% = FN_readsocket(sock%(i%), Buffer%, 256)
IF res% >= 0 THEN
Buffer%?res% = 0
rcvd$(i%) += $$Buffer%
IF LEFT$(rcvd$(i%),4) = "GET " AND ( \
\ RIGHT$(rcvd$(i%),4) = CHR$13+CHR$10+CHR$13+CHR$10 OR \
\ RIGHT$(rcvd$(i%),4) = CHR$10+CHR$13+CHR$10+CHR$13 OR \
\ RIGHT$(rcvd$(i%),2) = CHR$10+CHR$10 ) THEN
rcvd$(i%) = ""
IF FN_writelinesocket(sock%(i%), "HTTP/1.0 200 OK")
IF FN_writelinesocket(sock%(i%), "Content-type: text/html")
IF FN_writelinesocket(sock%(i%), "")
IF FN_writelinesocket(sock%(i%), "<html><head><title>Hello World!</title></head>")
IF FN_writelinesocket(sock%(i%), "<body><h1>Hello World!</h1>")
IF FN_writelinesocket(sock%(i%), "</body></html>")
PROC_closesocket(sock%(i%))
PRINT "Connection on socket " ; sock%(i%) " closed (local)"
sock%(i%) = 0
ENDIF
ELSE
PROC_closesocket(sock%(i%))
PRINT "Connection on socket " ; sock%(i%) " closed (remote)"
sock%(i%) = 0
ENDIF
ENDIF
NEXT i%
WAIT 0
UNTIL FALSE
END
[edit] C
This is, um, slightly longer than what other languages would be.
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <err.h>
char response[] = "HTTP/1.1 200 OK\r\n"
"Content-Type: text/html; charset=UTF-8\r\n\r\n"
"<doctype !html><html><head><title>Bye-bye baby bye-bye</title>"
"<style>body { background-color: #111 }"
"h1 { font-size:4cm; text-align: center; color: black;"
" text-shadow: 0 0 2mm red}</style></head>"
"<body><h1>Goodbye, world!</h1></body></html>\r\n";
int main()
{
int one = 1, client_fd;
struct sockaddr_in svr_addr, cli_addr;
socklen_t sin_len = sizeof(cli_addr);
int sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0)
err(1, "can't open socket");
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(int));
int port = 8080;
svr_addr.sin_family = AF_INET;
svr_addr.sin_addr.s_addr = INADDR_ANY;
svr_addr.sin_port = htons(port);
if (bind(sock, (struct sockaddr *) &svr_addr, sizeof(svr_addr)) == -1) {
close(sock);
err(1, "Can't bind");
}
listen(sock, 5);
while (1) {
client_fd = accept(sock, (struct sockaddr *) &cli_addr, &sin_len);
printf("got connection\n");
if (client_fd == -1) {
perror("Can't accept");
continue;
}
write(client_fd, response, sizeof(response) - 1); /*-1:'\0'*/
close(client_fd);
}
}
[edit] C++
C version compiles as C++ (known for G++ on Linux)
[edit] C#
using System.Text;
using System.Net.Sockets;
using System.Net;
namespace WebServer
{
class GoodByeWorld
{
static void Main(string[] args)
{
const string msg = "<html>\n<body>\nGoodbye, world!\n</body>\n</html>\n";
const int port = 8080;
bool serverRunning = true;
TcpListener tcpListener = new TcpListener(IPAddress.Any, port);
tcpListener.Start();
while (serverRunning)
{
Socket socketConnection = tcpListener.AcceptSocket();
byte[] bMsg = Encoding.ASCII.GetBytes(msg.ToCharArray(), 0, (int)msg.Length);
socketConnection.Send(bMsg);
socketConnection.Disconnect(true);
}
}
}
}
[edit] D
Using sockets only, also shows use of heredoc syntax, std.array.replace, and casting to bool to satisfy the while conditional.
import std.socket, std.array;
ushort port = 8080;
void main() {
Socket listener = new TcpSocket;
listener.bind(new InternetAddress(port));
listener.listen(10);
Socket currSock;
while(cast(bool)(currSock = listener.accept())) {
currSock.sendTo(replace(q"EOF
HTTP/1.1 200 OK
Content-Type: text/html; charset=UTF-8
<html>
<head><title>Hello, world!</title></head>
<body>Hello, world!</body>
</html>
EOF", "\n", "\r\n"));
currSock.close();
}
}
[edit] Delphi
program HelloWorldWebServer;
{$APPTYPE CONSOLE}
uses SysUtils, IdContext, IdCustomHTTPServer, IdHTTPServer;
type
TWebServer = class
private
FHTTPServer: TIdHTTPServer;
public
constructor Create;
destructor Destroy; override;
procedure HTTPServerCommandGet(AContext: TIdContext;
ARequestInfo: TIdHTTPRequestInfo; AResponseInfo: TIdHTTPResponseInfo);
end;
constructor TWebServer.Create;
begin
FHTTPServer := TIdHTTPServer.Create(nil);
FHTTPServer.DefaultPort := 8080;
FHTTPServer.OnCommandGet := HTTPServerCommandGet;
FHTTPServer.Active := True;
end;
destructor TWebServer.Destroy;
begin
FHTTPServer.Active := False;
FHTTPServer.Free;
inherited Destroy;
end;
procedure TWebServer.HTTPServerCommandGet(AContext: TIdContext;
ARequestInfo: TIdHTTPRequestInfo; AResponseInfo: TIdHTTPResponseInfo);
begin
AResponseInfo.ContentText := 'Goodbye, World!';
end;
var
lWebServer: TWebServer;
begin
lWebServer := TWebServer.Create;
try
Writeln('Delphi Hello world/Web server ');
Writeln('Press Enter to quit');
Readln;
finally
lWebServer.Free;
end;
end.
[edit] Dylan.NET
//compile with dylan.NET 11.2.9.6 or later!!
#refstdasm "mscorlib.dll"
#refstdasm "System.dll"
import System.Text
import System.Net.Sockets
import System.Net
assembly helloweb exe
ver 1.1.0.0
namespace WebServer
class public auto ansi GoodByeWorld
method public static void main(var args as string[])
var msg as string = c"<html>\n<body>\nGoodbye, world!\n</body>\n</html>\n"
var port as integer = 8080
var serverRunning as boolean = true
var tcpListener as TcpListener = new TcpListener(IPAddress::Any, port)
tcpListener::Start()
do while serverRunning
var socketConnection as Socket = tcpListener::AcceptSocket()
var bMsg as byte[] = Encoding::get_ASCII()::GetBytes(msg::ToCharArray(), 0, msg::get_Length())
socketConnection::Send(bMsg)
socketConnection::Disconnect(true)
end do
end method
end class
end namespace
[edit] Erlang
Using builtin HTTP server with call back to do/1. It only lasts 30 seconds (30000 milliseconds), then it is stopped. I fail to see how a longer time will serve any purpose.
-module( hello_world_web_server ).
-export( [do/1, httpd_start/2, httpd_stop/1, task/0] ).
do( _Data ) ->
{proceed, [{response,{200,"Goodbye, World!"}}]}.
httpd_start( Port, Module ) ->
Arguments = [{bind_address, "localhost"}, {port, Port}, {ipfamily, inet},
{modules, [Module]},
{server_name,erlang:atom_to_list(Module)}, {server_root,"."}, {document_root,"."}],
{ok, Pid} = inets:start( httpd, Arguments, stand_alone ),
Pid.
httpd_stop( Pid ) ->
inets:stop( stand_alone, Pid ).
task() ->
Pid = httpd_start( 8080, ?MODULE ),
timer:sleep( 30000 ),
httpd_stop( Pid ).
[edit] Fantom
using web
using wisp
const class HelloMod : WebMod // provides the content
{
override Void onGet ()
{
res.headers["Content-Type"] = "text/plain; charset=utf-8"
res.out.print ("Goodbye, World!")
}
}
class HelloWeb
{
Void main ()
{
WispService // creates the web service
{
port = 8080
root = HelloMod()
}.start
while (true) {} // stay running
}
}
[edit] Go
package main
import (
"fmt"
"log"
"net/http"
)
func main() {
http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
fmt.Fprintln(w, "Goodbye, World!")
})
log.Fatal(http.ListenAndServe(":8080", nil))
}
[edit] Haskell
Lightweightly concurrent "hello world" web server using the conduit stack:
{-# LANGUAGE OverloadedStrings #-}
import Data.ByteString.Char8 ()
import Data.Conduit ( ($$), yield )
import Data.Conduit.Network ( ServerSettings(..), runTCPServer )
main :: IO ()
main = runTCPServer (ServerSettings 8080 "127.0.0.1") $ const (yield response $$)
where response = "HTTP/1.0 200 OK\nContent-Length: 16\n\nGoodbye, World!\n"
Or using only "standard" features (base, bytestring and network from the Haskell Platform):
{-# LANGUAGE OverloadedStrings #-}
import Data.ByteString.Char8 ()
import Network hiding ( accept )
import Network.Socket ( accept )
import Network.Socket.ByteString ( sendAll )
import Control.Monad ( forever )
import Control.Exception ( bracket, finally )
import Control.Concurrent ( forkIO )
main :: IO ()
main = bracket (listenOn $ PortNumber 8080) sClose loop where
loop s = forever $ forkIO . request . fst =<< accept s
request c = sendAll c response `finally` sClose c
response = "HTTP/1.0 200 OK\nContent-Length: 16\n\nGoodbye, World!\n"
Both works like this:
$ curl http://localhost:8080/ Goodbye, World! # httperf --port=8080 --num-conns=10000 Request rate: 4549.5 req/s (0.2 ms/req) # httperf --port=8080 --num-conns=10000 --num-calls=2 Request rate: 8202.5 req/s (0.1 ms/req) Errors: total 10000 client-timo 0 socket-timo 0 connrefused 0 connreset 10000
Comparing to nginx:
# httperf --num-conns=10000 Request rate: 3613.2 req/s (0.3 ms/req) # httperf --num-conns=10000 --num-calls=10 Request rate: 9952.6 req/s (0.1 ms/req) # httperf --num-conns=10000 --num-calls=100 Request rate: 12341.0 req/s (0.1 ms/req)
which serve without any errors.
[edit] Io
WebRequest := Object clone do(
handleSocket := method(aSocket,
aSocket streamWrite("Goodbye, World!")
aSocket close
)
)
WebServer := Server clone do(
setPort(8080)
handleSocket := method(aSocket,
WebRequest clone asyncSend(handleSocket(aSocket))
)
)
WebServer start
[edit] J
If the desire is to use the browser as a gui, the easiest thing to do would be to download j7, edit the jhs script to start on port 8080, start jhs, visit http://127.0.0.1:8080/jijx then enter the text:
'Goodbye, World!'
This will compute the desired result and display it (actually, it will be displayed twice since the original string will also be displayed). This would be even simpler if you could just use the default jhs port (65001)... Alternatively, a jhs form could be used (but this would not have the exact url structure specified).
However, if the desire is to implement the task exactly, any of approaches at j:JWebServer might be used.
For example, here is a web server which ignores the client's request and always returns Goodbye, World:
hello=: verb define
8080 hello y NB. try to use port 8080 by default
:
port=: x
require 'socket'
coinsert 'jsocket'
sdclose ; sdcheck sdgetsockets ''
server=: {. ; sdcheck sdsocket ''
sdcheck sdbind server; AF_INET; ''; port
sdcheck sdlisten server, 1
while. 1 do.
while.
server e. ready=: >{. sdcheck sdselect (sdcheck sdgetsockets ''),'';'';<1e3
do.
sdcheck sdaccept server
end.
for_socket. ready do.
request=: ; sdcheck sdrecv socket, 65536 0
sdcheck (socket responseFor request) sdsend socket, 0
sdcheck sdclose socket
end.
end.
)
responseFor=: dyad define
'HTTP/1.0 200 OK',CRLF,'Content-Type: text/plain',CRLF,CRLF,'Goodbye, World!',CRLF
)
To deploy this server, once it has been defined, run
hello''
This version works because reasonable http requests fit in a single tcp packet. (And note that the server waits for one tcp packet before responding.) If parsing of the request is desired, one of the more complicated implementations at j:JWebServer should be used instead (but that's not really relevant for this task, except perhaps to require complete headers before responding, with broken browsers which send multiple tcp packets for the request).
[edit] Java
Multiple requests will be served in the order that they reach the server, with a queue size limit of 50 waiting requests imposed by default in the ServerSocket class (may be changed by adding a second positive integer argument to the ServerSocket constructor).
import java.io.IOException;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
public class HelloWorld{
public static void main(String[] args) throws IOException{
ServerSocket listener = new ServerSocket(8080);
while(true){
Socket sock = listener.accept();
new PrintWriter(sock.getOutputStream(), true).
println("Goodbye, World!");
sock.close();
}
}
}
[edit] JavaScript
var http = require('http');
http.createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Goodbye, World!\n');
}).listen(8080, '127.0.0.1');
It scales:
$ curl http://localhost:8080/ Goodbye, World! # httperf --port=8080 --num-conns=10000 Request rate: 1813.1 req/s (0.6 ms/req) # httperf --port=8080 --num-conns=10000 --num-calls=10 Request rate: 4869.1 req/s (0.2 ms/req) # httperf --port=8080 --num-conns=10000 --num-calls=100 Request rate: 5689.0 req/s (0.2 ms/req)
with no errors.
[edit] Liberty BASIC
This is difficult, although possible, in Liberty BASIC, but it's close relative Run BASIC is designed for serving webpages easily. The task becomes simply ..
print "hello world!"
[edit] Modula-2
This is a CGI executable:
MODULE access;
FROM InOut IMPORT WriteString, WriteLn;
BEGIN
WriteString ("Content-Type : text/plain");
WriteLn;
WriteLn;
WriteString ("Hello web wide world.");
WriteLn
END access.
[edit] NetRexx
/* NetRexx */
options replace format comments java crossref symbols binary
class RHelloWorldWebServer public
properties public constant
isTrue = boolean (1 == 1)
isFalse = boolean (1 \== 1)
greeting1 = "Goodbye, World!"
greeting2 = '' -
|| 'HTTP/1.1 200 OK\r\n' -
|| 'Content-Type: text/html; charset=UTF-8\r\n\r\n' -
|| '<?xml version="1.0" encoding="UTF-8"?>\r\n' -
|| '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">\r\n' -
|| '<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">\r\n' -
|| '<header>\r\n' -
|| '<title>Hello</title>\r\n' -
|| '<style type="text/css">body {font-family: sans-serif;}</style>\r\n' -
|| '</header>\r\n' -
|| '<body>\r\n' -
|| '<h2 style="text-align: center;">' || greeting1 || '</h2>\r\n' -
|| '</body>\r\n' -
|| '</html>\r\n' -
|| ''
properties static inheritable
terminate = isFalse -- TODO: provide a less draconian means to terminate the listener loop
method main(args = String[]) public static signals IOException
listener = ServerSocket(8080)
loop label listener forever
if terminate then leave listener
sock = listener.accept()
PrintWriter(sock.getOutputStream(), isTrue).println(greeting2)
sock.close()
end listener
return
[edit] Objeck
use Net;
use Concurrency;
bundle Default {
class GoodByeWorld {
function : Main(args : String[]) ~ Nil {
server := TCPSocketServer->New(8080);
if(server->Listen(5)) {
while(true) {
client := server->Accept();
client->WriteString("<html>\n<body>\nGoodbye, world!\n</body>\n</html>\n");
client->Close();
};
};
server->Close();
}
}
}
[edit] OCaml
This code is derived from this ocaml-unix documentation.
let try_finalise f x finally y =
let res = try f x with e -> finally y; raise e in
finally y;
res
let rec restart_on_EINTR f x =
try f x with Unix.Unix_error (Unix.EINTR, _, _) -> restart_on_EINTR f x
let double_fork_treatment server service (client_descr, _ as client) =
let treat () =
match Unix.fork () with
| 0 ->
if Unix.fork () <> 0 then exit 0;
Unix.close server; service client; exit 0
| k ->
ignore (restart_on_EINTR (Unix.waitpid []) k)
in
try_finalise treat () Unix.close client_descr
let install_tcp_server_socket addr =
let s = Unix.socket Unix.PF_INET Unix.SOCK_STREAM 0 in
try
Unix.bind s addr;
Unix.listen s 10;
s
with e -> Unix.close s; raise e
let tcp_server treat_connection addr =
ignore (Sys.signal Sys.sigpipe Sys.Signal_ignore);
let server_sock = install_tcp_server_socket addr in
while true do
let client = restart_on_EINTR Unix.accept server_sock in
treat_connection server_sock client
done
let server () =
let port = 8080 in
let host = (Unix.gethostbyname (Unix.gethostname())).Unix.h_addr_list.(0) in
let addr = Unix.ADDR_INET (host, port) in
let treat sock (client_sock, client_addr as client) =
let service (s, _) =
let response = "\
HTTP/1.1 200 OK\r\n\
Content-Type: text/html; charset=UTF-8\r\n\r\n\
<html><head><title>Goodbye, world!</title>\
<style>body { background-color: #0FF }\
h1 { font-size:3em; color: black; }</style></head>\
<body><h1>Goodbye, world!</h1></body></html>\r\n"
in
Unix.write s response 0 (String.length response);
in
double_fork_treatment sock service client
in
tcp_server treat addr
let _ =
Unix.handle_unix_error server ()
[edit] Opa
From Opa documentation:
server = one_page_server("Hello", -> <>Goodbye, world</>)
Compile and run:
opa file.opa --
[edit] Perl
use Socket;
my $port = 8080;
my $protocol = getprotobyname( "tcp" );
socket( SOCK, PF_INET, SOCK_STREAM, $protocol ) or die "couldn't open a socket: $!";
# PF_INET to indicate that this socket will connect to the internet domain
# SOCK_STREAM indicates a TCP stream, SOCK_DGRAM would indicate UDP communication
setsockopt( SOCK, SOL_SOCKET, SO_REUSEADDR, 1 ) or die "couldn't set socket options: $!";
# SOL_SOCKET to indicate that we are setting an option on the socket instead of the protocol
# mark the socket reusable
bind( SOCK, sockaddr_in($port, INADDR_ANY) ) or die "couldn't bind socket to port $port: $!";
# bind our socket to $port, allowing any IP to connect
listen( SOCK, SOMAXCONN ) or die "couldn't listen to port $port: $!";
# start listening for incoming connections
while( accept(CLIENT, SOCK) ){
print CLIENT "HTTP/1.1 200 OK\r\n" .
"Content-Type: text/html; charset=UTF-8\r\n\r\n" .
"<html><head><title>Goodbye, world!</title></head><body>Goodbye, world!</body></html>\r\n";
close CLIENT;
}
Various modules exist for using sockets, including the popular IO::Socket which provides a simpler and more friendly OO interface for the socket layer. Here is the solution using this module:
use IO::Socket::INET;
my $sock = new IO::Socket::INET ( LocalAddr => "127.0.0.1:8080",
Listen => 1,
Reuse => 1, ) or die "Could not create socket: $!";
while( my $client = $sock->accept() ){
print $client "HTTP/1.1 200 OK\r\n" .
"Content-Type: text/html; charset=UTF-8\r\n\r\n" .
"<html><head><title>Goodbye, world!</title></head><body>Goodbye, world!</body></html>\r\n";
close $client;
}
Using Perl's glue power, provide a suicide note with visitor counter via netcat:
while (++(our $vn)) {
open NC, "|-", qw(nc -l -p 8080 -q 1);
print NC "HTTP/1.0 200 OK\xd\xa",
"Content-type: text/plain; charset=utf-8\xd\xa\xd\xa",
"Goodbye, World! (hello, visitor No. $vn!)\xd\xa";
}
Here's another solution using Plack (may be found on CPAN):
use Plack::Runner;
my $app = sub {
return [ 200,
[ 'Content-Type' => 'text/html; charset=UTF-8' ],
[ '<html><head><title>Goodbye, world!</title></head><body>Goodbye, world!</body></html>' ]
]
};
my $runner = Plack::Runner->new;
$runner->parse_options('--host' => 'localhost', '--port' => 8080);
$runner->run($app);
When using plackup, then this may be compressed to one line:
my $app = sub { return [ 200, [ 'Content-Type' => 'text/html; charset=UTF-8' ], [ '<html><head><title>Goodbye, world!</title></head><body>Goodbye, world!</body></html>' ] ] };Use
plackup --host localhost --port 8080 script.psgito start the webserver.
[edit] Perl 6
my $sock = IO::Socket::INET.new(:localhost('0.0.0.0'), :localport(8080), :listen);
say "Goodbye Web Server listening on $sock.localhost():$sock.localport()";
while $sock.accept -> $client {
$client.send: "HTTP/1.0 200 OK\r\nContent-Type: text/plain; charset=UTF-8\r\n\r\nGoodbye, World!\r\n";
$client.close;
}
[edit] PicoLisp
Contents of the file "goodbye.l":
(html 0 "Bye" NIL NIL
"Goodbye, World!" )
Start server:
$ pil @lib/http.l @lib/xhtml.l -'server 8080 "goodbye.l"' -wait
[edit] Prolog
% The following modules are used in the main module to start a server.
:- use_module(library(http/thread_httpd)).
:- use_module(library(http/http_dispatch)).
% The following module is used in every module that describes a page.
:- use_module(library(http/html_write)).
% Main entry point: starts the server on port 8080.
server :- http_server(http_dispatch, [port(8080)]).
% Defines the handler for the root URI /.
:- http_handler('/', say_goodbye, []).
% Defines the actual page content.
% In this case we're returning a page with the title "Howdy" and the content,
% wrapped in <h1></h1> tags, "Goodbye, World!".
say_goodbye(_Request) :- reply_html_page([title('Howdy')],
[h1('Goodbye, World!')]).
[edit] PureBasic
If InitNetwork() = 0
MessageRequester("Error", "Can't initialize the network !")
End
EndIf
Port = 8080
If CreateNetworkServer(0, Port)
Repeat
Delay(1)
SEvent = NetworkServerEvent()
If SEvent
ClientID = EventClient()
Select SEvent
Case #PB_NetworkEvent_Data
SendNetworkData(ClientID,@"Goodbye, World!",Len("Goodbye, World!"))
CloseNetworkConnection(ClientID)
EndSelect
EndIf
ForEver
Else
MessageRequester("Error", "Can't create the server (port in use ?).")
EndIf
[edit] PHP
<?php
// AF_INET6 for IPv6 // IP
$socket = socket_create(AF_INET, SOCK_STREAM, 0) or die('Failed to create socket!');
// '127.0.0.1' to limit only to localhost // Port
socket_bind($socket, 0, 8080);
socket_listen($socket);
$msg = '<html><head><title>Goodbye, world!</title></head><body>Goodbye, world!</body></html>';
for (;;) {
// @ is used to stop PHP from spamming with error messages if there is no connection
if ($client = @socket_accept($socket)) {
socket_write($client, "HTTP/1.1 200 OK\r\n" .
"Content-length: " . strlen($msg) . "\r\n" .
"Content-Type: text/html; charset=UTF-8\r\n\r\n" .
$msg);
}
else usleep(100000); // limits CPU usage by sleeping after doing every request
}
[edit] Python
def app(environ, start_response):
start_response('200 OK', [])
yield "Goodbye, World!"
if __name__ == '__main__':
from wsgiref.simple_server import make_server
server = make_server('127.0.0.1', 8080, app)
server.serve_forever()
[edit] Racket
#lang racket
(require web-server/servlet web-server/servlet-env)
(define (start req) (response/xexpr "Goodbye, World!"))
(serve/servlet start #:port 8080 #:servlet-path "/")
[edit] REALbasic
Class HTTPSock
Inherits TCPSocket
Event Sub DataAvailable()
Dim headers As New InternetHeaders
headers.AppendHeader("Content-Length", Str(LenB("Goodbye, World!")))
headers.AppendHeader("Content-Type", "text/plain")
headers.AppendHeader("Content-Encoding", "identity")
headers.AppendHeader("Connection", "close")
Dim data As String = "HTTP/1.1 200 OK" + EndOfLine.Windows + headers.Source + EndOfLine.Windows + EndOfLine.Windows + "Goodbye, World!"
Me.Write(data)
Me.Close
End Sub
End Class
Class HTTPServ
Inherits ServerSocket
Event Sub AddSocket() As TCPSocket
Return New HTTPSock
End Sub
End Class
Class App
Inherits Application
Event Sub Run(Args() As String)
Dim sock As New HTTPServ
sock.Port = 8080
sock.Listen()
While True
App.DoEvents
Wend
End Sub
End Class
[edit] Ruby
Using the WEBrick module from Ruby's standard library.
require 'webrick'
server = WEBrick::HTTPServer.new(:Port => 8080)
server.mount_proc('/') {|request, response| response.body = "Goodbye, World!"}
trap("INT") {server.shutdown}
server.start
Using the sinatra gem:
require 'sinatra'
get("/") { "Goodbye, World!" }
[edit] Run BASIC
html "Hello World!"
[edit] Salmon
use "http.salm" : "http.si";
/* Don't do any logging. */
procedure log(...) { };
simple_http_server(8080, procedure(header, connection)
{ respond_text(connection, "Goodbye, World!"); });
[edit] Seed7
The code below was inspired by the example code for the function openInetListener.
$ include "seed7_05.s7i";
include "listener.s7i";
const proc: main is func
local
var listener: aListener is listener.value;
var file: sock is STD_NULL;
begin
aListener := openInetListener(8080);
listen(aListener, 10);
while TRUE do
sock := accept(aListener);
write(sock, "HTTP/1.1 200 OK\r\n\
\Content-Type: text/html; charset=UTF-8\r\n\
\\r\n\
\<html><body>Hello, world!</body></html>\n");
close(sock);
end while;
end func;
[edit] Smalltalk
starting server:
Smalltalk loadPackage:'stx:goodies/webServer'. "usually already loaded"
|myServer service|
myServer := HTTPServer startServerOnPort:8082.
service := HTTPPluggableActionService new.
service
register:[:request |
self halt: 'debugging'.
request reply:'<HTML><BODY><H1>Hello World</H1></BODY></HTML>'
]
as:'hello'.
service linkNames:#('/' ).
service registerServiceOn: myServer.
myServer start.
Be aware that the above is an ad-hoc minimal scripting example. Normally, a service subclass is used and response handlers are defined as methods of it (not as action blocks). Also, services and HTML generation is usually done using a framework (at least DOM-based, but usually a higher level toolkit). Especially take a look at smalltalk frameworks like Aida, Seaside, VisualWave etc.
[edit] Tcl
This version is adapted from the Tcler's Wiki.
proc accept {chan addr port} {
while {[gets $chan] ne ""} {}
puts $chan "HTTP/1.1 200 OK\nConnection: close\nContent-Type: text/plain\n"
puts $chan "Goodbye, World!"
close $chan
}
socket -server accept 8080
vwait forever
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