atto - 10⁻¹⁸ × webserver

atto is a really, really, really small webserver for static files. Barely more than go's standard http.FileServer.

Usage

The easiest way to use it is by creating your own image based on the costela/atto image:

FROM costela/atto
COPY /path_to_my_staticfile_dir/ /www/

Integrate this into your CD pipeline and deploy it on e.g. kubernetes, behind a reverse proxy (e.g. traefik).

Features

Basically none, but it can and will gladly serve static files. It does not (and will not) support SSL, vHosts, aliases or any of the more advanced features of full-fledged webservers.

Nevertheless, it does have the basics:

• optional directory listing (inherited from http.FileServer; see --showlist option)
• optional transparent compression of content (see --compress option)
• handle running under some folder below / (see --prefix option)
• graceful shutdown to avoid disrupting long-running connections during deployment (see --timeout.shutdown option)

Configuration

The following settings may be provided as command line arguments or environment variables.

Flag	Env-Var	Description	Default
--compress	ATTO_COMPRESS	whether to transparently compress served files	true
--loglevel, -l	ATTO_LOGLEVEL	level of logging output (any value supported by logrus)	warn
--port	ATTO_PORT	TCP port on which to listen	8080
--path	ATTO_PATH	path which will be served	.
--path404	ATTO_PATH	path to a file returned when the requested content cannot be found	404.html
--prefix	ATTO_PREFIX	prefix under which path will be accessed	none
--canonical.host	ATTO_CANONICAL_HOST	if this host (FQDN) is set, requests using different hosts will be redirected to it (e.g.: www.foo.bar to foo.bar)	none
--canonical.statuscode	ATTO_CANONICAL_STATUSCODE	http status code to use for the canonical host redirect	302 (temporary)
--showlist	ATTO_SHOWLIST	whether to display folder contents	false
--timeout.readheader	ATTO_TIMEOUT_READHEADER	time to wait for request headers	5s
--timeout.shutdown	ATTO_TIMEOUT_SHUTDOWN	time to wait for ungoing requests to finish before shutting down	30s

Motivation

The main use-case for atto is simplifying the build/deployment process of applications with static files, so that the same mental toolset can be used both for code and assets.

It is not a replacement for proper production deployment, but can ease the cognitive load when dealing with smaller, less often touched apps.

License

MIT - See LICENSE file.