Here’s a disconnected hodge-podge of things related to Service Workers I’ve noticed recently…
Service Workers have landed in Firefox. When it was first unveiled in a nightly build a few people spotted some weird character issues on sites like mine that are using Service Workers, but that should all be fixed in the next release.
A while back I voted up Service Workers on Microsoft’s roadmap for Edge. I got an email today to say that the roadmap priority is high:
We intend to begin development soon.
Here’s a little gotcha that had me tearing my hair out until I tracked down the culprit: don’t use Header append Vary User-Agent in your site’s Apache config file. I don’t know why it snuck in there in the first place, but once I removed it, it fixed a weird issue that Aaron T. Grogg pointed out to me whereby my offline page would get cached, but not my CSS.
I really like this proposal for:
<link rel="serviceworker" href="/serviceworker.js">
It makes sense to me that I should be able to point to the Service Worker of a page in the same way that I point to a style sheet. It makes sense as a rel value too: “the linked resource has the relationship of ‘serviceworker’ to the current document.”
First, I’m hugely indebted to Jeremy Keith for the implementation of service workers on his own website, which served as the starting point for my own code.
Going through her code, she made this remark:
Note: I use certain ECMAScript6 (or ES2015) features in the sample code for service workers because browsers that support service workers also support these features.
Jake is looking for feedback on a specific part of Service Worker functionality around URLs. If I can wrap my head around what’s being described, I’ll chime in.
Finally, I had a nice little Service Worker moment earlier today. I was doing some updates on my web server that required a reboot. When I checked in Chrome to see how long adactio.com was down, I was surprised to see that the downtime appeared to be …zero. “That’s odd” I thought, “How can my site still be reachable if the server is …oh!” That’s when I realised I was seeing a cached version of my homepage. My Service Worker was doing it’s thing.
I had been thinking of Service Workers as a tool to help in situations where the user agent goes offline. But of course it’s an equally useful tool for when the server goes offline. This was a nice reminder of that.
This was originally posted on my own site.