You can provide custom headers and other server configuration for your site by adding them to _config.yml:

# File: _config.yml
server:
  headers:
    My-Header: My-Value
    My-Other-Header: My-Other-Value
  host: 0.0.0.0
  port: 4000
  livereload: true

Defaults

Rustyll provides by default Content-Type and Cache-Control response headers: one dynamic to specify the nature of the data being served, the other to disable caching during development so you can see changes immediately without fighting with browser caching.

Performance Improvements

Rustyll’s development server is significantly faster than Jekyll’s WEBrick server:

1. Multi-threaded request handling - serves requests in parallel
2. Efficient file system monitoring - only rebuilds what changed
3. Live reload - notifies the browser to reload using a WebSocket connection
4. Hot content replacement - when possible, updates only the changed content without a full page reload

Configuration Options

Option	Description	Default
host	The hostname or IP address to listen on	127.0.0.1
port	The port to listen on	4000
livereload	Whether to enable live reloading	false
livereload_port	The port for the LiveReload server	35729
headers	Custom HTTP headers to add to responses	{}
open_url	Whether to open the site in a browser	false
threads	Number of threads for request handling	auto