connect-cachify-static

static (simpler and faster) variant of connect-cachify middleware

Adds Cache-Control: max-age=31536000 header to all requests with 'cachified' prefix. Prefix is based on the file content and calculated for all files during application startup (which means that it won't handle dynamically generated files).

If you reference cachifieable resources from CSS files you probably also want to use postcss-cachify.

Installation

$ npm install connect-cachify-static

Options

• match - regular expression that determines which files in root will be cachified, if omitted the usual suspects are included .js, .css, .png, .jpg, and .gif
• control_headers - if truthy, the middleware will strip ETag and Last-Modified headers from the response
• format - function that creates cachified version of the URL - allowed values are 'path', 'name', or the function that takes path and hash and creates cachified version of the file URL

API

cachify function is injected in res.locals and thus can be accessed from the template code. cachify and filter can be also retrieved by calling await helpers() on the initialized middleware instance

cachify(path, integrity)

• path - URL of the resource to be cachified
• integrity - optional - if truthy cachify will generate a tuple { path, integrity }, which can be used to format <script> and <link> elements with subresource integrity support

It should be called when generating HTML, CSS etc., in order to create a 'cachified' URL for the resource. cachify will replace /path/to/the/file with cachified version incorporating reasonably unique {prefix} generated based on the file content.

The specific format of the cachified version depends on the format parameter:

• path default

  /path/to/the/file -> /{prefix}/path/to/the/file

• name

  /path/to/the/file -> /path/to/the/{prefix}- file

You can also pass a format function:

1// this is how default format is implemented
2function format(path, prefix) {
3  return '/' + prefix + path;
4}
5

Since using cachify will make the browsers to cache the resource for approximately 1 year we need to bust the cache whenever the resource content changes.

1head
2  //- styles
3  link(rel="stylesheet", href=cachify('/css/style.css'), media="screen")
4  link(rel="stylesheet", href=cachify('/css/print.css'), media="print")
5body
6  // can be used to pass cachified URLs to client scripts
7  #info(data-icon=cachify('/img/icon.png'))
8  //- scripts
9  script(src=cachify('/script/main.js'), defer)
10
11  //- scripts with SRI support
12  - var c = cachify('/script/main.js', true)
13  script(src=c.path, integrity=c.integrity, crossorigin='anonymous', defer)
14

filter(patter)

returns an array of cachified paths matching pattern

Usage

1var connect = require('connect');
2var cachifyStatic = require('connect-cachify-static');
3
4connect()
5  .use(cachifyStatic(__dirname + '/public'), {
6    match: /\.js$/ // only javascript files
7  })
8// need static to actually serve the file
9connect()
10  .use(connect.static(__dirname + '/public'))

License

MIT