docs » hs.httpserver


Simple HTTP server

Notes:

  • Running an HTTP server is potentially dangerous, you should seriously consider the security implications of exposing your Hammerspoon instance to a network - especially to the Internet
  • As a user of Hammerspoon, you are assumed to be highly capable, and aware of the security issues

Submodules

API Overview

API Documentation

Functions

new

Signature hs.httpserver.new([ssl], [bonjour]) -> object
Type Function
Description Creates a new HTTP or HTTPS server
Parameters
  • ssl - An optional boolean. If true, the server will start using HTTPS. Defaults to false.
  • bonjour - An optional boolean. If true, the server will advertise itself with Bonjour. Defaults to true. Note that in order to change this, you must supply a true or false value for the `ssl` argument.
Returns
  • An `hs.httpserver` object
Notes
  • By default, the server will start on a random TCP port and advertise itself with Bonjour. You can check the port with `hs.httpserver:getPort()`
  • By default, the server will listen on all network interfaces. You can override this with `hs.httpserver:setInterface()` before starting the server
  • Currently, in HTTPS mode, the server will use a self-signed certificate, which most browsers will warn about. If you want/need to be able to use `hs.httpserver` with a certificate signed by a trusted Certificate Authority, please file an bug on Hammerspoon requesting support for this.

Methods

getInterface

Signature hs.httpserver:getInterface() -> string or nil
Type Method
Description Gets the network interface the server is configured to listen on
Parameters
  • None
Returns
  • A string containing the network interface name, or nil if the server will listen on all interfaces

getName

Signature hs.httpserver:getName() -> string
Type Method
Description Gets the Bonjour name the server is configured to advertise itself as
Parameters
  • None
Returns
  • A string containing the Bonjour name of this server
Notes
  • This is not the hostname of the server, just its name in Bonjour service lists (e.g. Safari's Bonjour bookmarks menu)

getPort

Signature hs.httpserver:getPort() -> number
Type Method
Description Gets the TCP port the server is configured to listen on
Parameters
  • None
Returns
  • A number containing the TCP port

maxBodySize

Signature `hs.httpserver:maxBodySize([size]) -> object current-value` </span>
Type Method
Description Get or set the maximum allowed body size for an incoming HTTP request.
Parameters
  • size - An optional integer value specifying the maximum body size allowed for an incoming HTTP request in bytes. Defaults to 10485760 (10 MB).
Returns
  • If a new size is specified, returns the `hs.httpserver` object; otherwise the current value.
Notes
  • Because the Hammerspoon http server processes incoming requests completely in memory, this method puts a limit on the maximum size for a POST or PUT request.

send

Signature hs.httpserver:send(message) -> object
Type Method
Description Sends a message to the websocket client
Parameters
  • message - A string containing the message to send
Returns
  • The `hs.httpserver` object

setCallback

Signature hs.httpserver:setCallback([callback]) -> object
Type Method
Description Sets the request handling callback for an HTTP server object
Parameters
  • callback - An optional function that will be called to process each incoming HTTP request, or nil to remove an existing callback. See the notes section below for more information about this callback
Returns
  • The `hs.httpserver` object
Notes
  • The callback will be passed four arguments:
  • A string containing the type of request (i.e. `GET`/`POST`/`DELETE`/etc)
  • A string containing the path element of the request (e.g. `/index.html`)
  • A table containing the request headers
  • A string containing the raw contents of the request body, or the empty string if no body is included in the request.
  • The callback *must* return three values:
  • A string containing the body of the response
  • An integer containing the response code (e.g. 200 for a successful request)
  • A table containing additional HTTP headers to set (or an empty table, `{}`, if no extra headers are required)

setInterface

Signature hs.httpserver:setInterface(interface) -> object
Type Method
Description Sets the network interface the server is configured to listen on
Parameters
  • interface - A string containing an interface name
Returns
  • The `hs.httpserver` object
Notes
  • As well as real interface names (e.g. `en0`) the following values are valid:
  • An IP address of one of your interfaces
  • localhost
  • loopback
  • nil (which means all interfaces, and is the default)

setName

Signature hs.httpserver:setName(name) -> object
Type Method
Description Sets the Bonjour name the server should advertise itself as
Parameters
  • name - A string containing the Bonjour name for the server
Returns
  • The `hs.httpserver` object
Notes
  • This is not the hostname of the server, just its name in Bonjour service lists (e.g. Safari's Bonjour bookmarks menu)

setPassword

Signature hs.httpserver:setPassword([password]) -> object
Type Method
Description Sets a password for an HTTP server object
Parameters
  • password - An optional string that contains the server password, or nil to remove an existing password
Returns
  • The `hs.httpserver` object
Notes
  • It is not currently possible to set multiple passwords for different users, or passwords only on specific paths

setPort

Signature hs.httpserver:setPort(port) -> object
Type Method
Description Sets the TCP port the server is configured to listen on
Parameters
  • port - An integer containing a TCP port to listen on
Returns
  • The `hs.httpserver` object

start

Signature hs.httpserver:start() -> object
Type Method
Description Starts an HTTP server object
Parameters
  • None
Returns
  • The `hs.httpserver` object

stop

Signature hs.httpserver:stop() -> object
Type Method
Description Stops an HTTP server object
Parameters
  • None
Returns
  • The `hs.httpserver` object

websocket

Signature hs.httpserver:websocket(path, callback) -> object
Type Method
Description Enables a websocket endpoint on the HTTP server
Parameters
  • path - A string containing the websocket path such as '/ws'
  • callback - A function returning a string for each recieved websocket message
Returns
  • The `hs.httpserver` object
Notes
  • The callback is passed one string parameter containing the received message
  • The callback must return a string containing the response message
  • Given a path '/mysock' and a port of 8000, the websocket URL is as follows:
  • ws://localhost:8000/mysock
  • wss://localhost:8000/mysock (if SSL enabled)

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