{{This is the version of your cached configuration. In case you want to reload it, some change must be done in this file, if not in the content itself, at least, in the version number. This number is also used to name your cached files.
"dswVersion": 2.2,Will force previous service workers to stop, and replace them for the newer one otherwise, your new service worker configuration will only take place when the current service worker experes (the next reload, or about a day)
"applyImmediately": true,Add here, a list of files that should be cached during the installation of the webservice.
"appShell": [],If this is set to true, every request for http:// will be redirected to https://
"enforceSSL": false,Default is false, if changed to true, will NOT delete other caches otherwise, all caches but the current ones will be deleted on activation
"keepUnusedCaches": false,Here is where you will add all of your rules. You can create as many as you want, and name them as you will.
"dswRules": {You may name your rules here this rule will redirect every not found image (or with error) to a default image
"imageNotFound": {everything that matches a status like 404 or 500 and is an image (in the given extensions)
"match": {We are looking for everything with a status 400 or 500
"status": [404, 500],AND with one of these extensions
"extension": ["jpg", "gif", "png", "jpeg", "webp"]
},
"apply": {will actually become a default 404 image
"fetch": "/images/public/404.jpg"
}
},You can also output a string right away
"easterEgg": {
"match": { "path": "/easter-egg" },
"apply": {by using the output action (it accepts variables, as in other examples)
"output": "You found an easter egg!!!"
}
}This other example redirects pages that are not found
"pageNotFound": {Any requisition that has a 404 status (including css, js, etc)
"match": {
"status": [404]
},
"apply": {will receive our default 404 page
"fetch": "/404.html"
}
},Redirecting requests
"redirectOlderPage": {
"match": {In this example, everything inside this directory should be redirected
"path": "/legacy-images/.*"
},
"apply": {we simply fetch the different content we could also use the “redirect” action here, it would work as the same, but with a 302 status header
"fetch": "/images/public/gizmo.jpg"
}
},Some times, we want something NOT to be cached. In the following examples, we will cache EVERY image. That’s why we are defining here one exception.
"imageNotCached": {the image named “not-cached” will
"match": { "path": "/images/not-cached" },
"apply": {not be cached…ever!
"cache": false
}
},Now, let’s create a cache for every single image (except the one before)
"images": {Everything that matches the right extensions (and has a status different than 404 or 500, once we already defined rules for those)
"match": { "extension": ["jpg", "gif", "png", "jpeg", "webp"] },
"apply": {
"cache": {will be cached at “cached-images::1”
"name": "cached-images",If you don’t specify the version, it uses the value in dswVersion
"version": "1"
}
}
},let’s cache our static files
"statics": {all of our scripts and styles will be cached (once they don’t meet the prefious criteria of 404 status)
"match": { "extension": ["js", "css"] },
"apply": {
"cache": {
"name": "static-files",
"version": "1"
}
}
},In this example, we are redirecting requests using variables from the matching regular expression
"redirectWithVar": {
"match": {We can use in our apply actions, the groups from this expression, between parenthesis
"path": "/old-site/(.*)"
},
"apply": {here, each groups is represented by a variable, in order accessed as $x where x is the position of the variable in the matching expression
"redirect": "/redirected.html?from=$1"
}
},Lets cache everything that has html extension OR is at / Notice there we are using the OR here, instead of just the AND
"static-html": {
"match": [everything with the html or htm extension
{ "extension": ["html", "htm"] },OR everything in /
{ "path": "/$" }
],The default strategy is ‘offline-first’ With the online-first strategy, it will ALWAYS go for the network and use it to update the cache. Cache will ONLY be used when the network fails.
"strategy": "online-first",
"apply": {
"cache": {
"name": "static-html-files",
"version": "1"we can also expire the cache
"expires": "1h" // 1s, 1m, 1h, 1d, 1w, 1M, 1y
}
}
},Let’s use IndexedDB to store some data
"userData": {
"match": { "path": "/api/user/.*" },We will try to keep it up to date. DSW will look for it online, and if not possible, then look in the cached object in IndexedDB.
"strategy": "offline-first",
"apply": {
"indexedDB": {The IndexedDB name
"name": "userData",The version of it. If you change it, your db will be updated.
"version": "3",The json data we are expecting in this example gives us and id, and we will use it as our kay for the IndexedDB structure.
"key": "id",but we will also define some indexes
"indexes": [one of the indexes is the property “name”
"name",the other index is the property “twitter”…
{
"name": "twitter",
"path": "twitter",…but for this one, we want to specify that it is unique.
"options": {
"unique": true
}
}
]
}
}
},You can also bypass some requests
"byPassable": {
"match": { "path": "/bypass/" },
"apply": {With the “request” value, it WILL perform the request, with no treatment. But the response will either be the response itself(in case of success) or an empty string(if failed)
"bypass": "request"
}
},When bypassing, you may also want to simply ignore some path
"ignorable": {imagine you have an old path and that some legacy script, html or css is still trying to load resources from it
"match": { "path": "/ignore/" },
"apply": {by ignoring it, no network request will be started, and the output will be always a successful empty string
"bypass": "ignore"
}
},
"dashbord": {
"match": { "path": "/api/dashbord/.*" },Here, we are telling the browser to send cookies and session credentions when fetching this You can pass any options accepted by fetch, here
"options": { "credentials": "same-origin"},With the fastest strategy, both the network and cache will be verified. It means it will always start a new request, but also means that once it’s resolved, it will keep the cache up to date. If the data is in cache, it will use the cached data. It assures us that the fastest result will be used, but also, that it will keep the data up to date in the cache
"strategy": "fastest",
"apply": {indexedDB support is still under development…
"indexedDB": {
"name": "dashbord",
"version": "1",we can specify indexes using only strings
"indexes": ["name"]
}
}
}
}
}