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fun/examples/data/htdocs/hello.fun

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Standard ML

#!/usr/bin/env fun
/*
* This file is part of the Fun programming language.
* https://fun-lang.xyz/
*
* Copyright 2026 Johannes Findeisen <you@hanez.org>
* Licensed under the terms of the Apache-2.0 license.
* https://opensource.org/license/apache-2-0
*
* Added: 2026-03-25
*/
#include <net/cgi.fun>
cgi = CGI()
name = cgi.param("name")
if (len(name) == 0)
name = "World"
ua = cgi.cookie("ua")
if (len(ua) == 0)
// Set a demo cookie via header()
cgi.header("Set-Cookie", "ua=FunClient; Path=/; HttpOnly")
cgi.content_type("text/html; charset=utf-8")
html = ""
html = html + "<html><head><title>Fun CGI</title></head><body>"
html = html + "<h1>Hello, " + cgi.escape_html(name) + "!</h1>"
html = html + "<p>REQUEST_METHOD: " + cgi.escape_html(cgi.env["REQUEST_METHOD"]) + "</p>"
html = html + "<p>QUERY_STRING: " + cgi.escape_html(cgi.env["QUERY_STRING"]) + "</p>"
html = html + "<p>User-Agent cookie: " + cgi.escape_html(ua) + "</p>"
// Render parsed CGI params as key => value(s)
pmap = cgi.params()
html = html + "<h2>Params</h2><ul>"
for k in keys(pmap)
vals = cgi.param_all(k)
// Join multiple values with ", "
i = 0
n = len(vals)
joined = ""
while (i < n)
if (i > 0)
joined = joined + ", "
joined = joined + cgi.escape_html(vals[i])
i = i + 1
html = html + "<li><b>" + cgi.escape_html(k) + "</b>: " + joined + "</li>"
html = html + "</ul>"
html = html + "</body></html>"
// Send CGI headers + body
cgi.send(html)
/* Expected output (GET /hello.fun?name=Fun with no ua cookie):
Status: 200 OK
Content-Type: text/html; charset=utf-8
Set-Cookie: ua=FunClient; Path=/; HttpOnly
<html><head><title>Fun CGI</title></head><body><h1>Hello, Fun!</h1><p>REQUEST_METHOD: GET</p><p>QUERY_STRING: name=Fun</p><p>User-Agent cookie: </p><h2>Params</h2><ul><li><b>name</b>: Fun</li></ul></body></html>
*/