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#!/usr/bin/env lua
--[[
A simple HTTP server
If a request is not a HEAD method, then reply with "Hello world!"
Usage: lua examples/server_hello.lua [<port>]
]]
local port = arg[1] or 0 -- 0 means pick one at random
local http_server = require "http.server"
local http_headers = require "http.headers"
local function reply(myserver, stream) -- luacheck: ignore 212
-- Read in headers
local req_headers = assert(stream:get_headers())
local req_method = req_headers:get ":method"
-- Log request to stdout
assert(io.stdout:write(string.format('[%s] "%s %s HTTP/%g" "%s" "%s"\n',
os.date("%d/%b/%Y:%H:%M:%S %z"),
req_method or "",
req_headers:get(":path") or "",
stream.connection.version,
req_headers:get("referer") or "-",
req_headers:get("user-agent") or "-"
)))
-- Build response headers
local res_headers = http_headers.new()
res_headers:append(":status", "200")
res_headers:append("content-type", "text/plain")
-- Send headers to client; end the stream immediately if this was a HEAD request
assert(stream:write_headers(res_headers, req_method == "HEAD"))
if req_method ~= "HEAD" then
-- Send body, ending the stream
assert(stream:write_chunk("Hello world!\n", true))
end
end
local myserver = assert(http_server.listen {
host = "localhost";
port = port;
onstream = reply;
onerror = function(myserver, context, op, err, errno) -- luacheck: ignore 212
local msg = op .. " on " .. tostring(context) .. " failed"
if err then
msg = msg .. ": " .. tostring(err)
end
assert(io.stderr:write(msg, "\n"))
end;
})
-- Manually call :listen() so that we are bound before calling :localname()
assert(myserver:listen())
do
local bound_port = select(3, myserver:localname())
assert(io.stderr:write(string.format("Now listening on port %d\n", bound_port)))
end
-- Start the main server loop
assert(myserver:loop())
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