AWS lambda is a neat feature that runs code in response to requests and transforms the code's output into some response. Requests can be an event occurring in the AWS platform such as an S3 modification or an HTTP request. The response is an MVC-style model which needs to pass through some network component, like … Continue reading AWS diaries: serving HTML from lambda
Category: web
Error handling for failed network requests with service workers
Most service worker code samples show only the happy path where the fetched resource will eventually be available, eg: self.addEventListener('fetch', event => { // Skip cross-origin requests, like those for Google Analytics. if (event.request.url.startsWith(self.location.origin)) { event.respondWith( caches.match(event.request).then(cachedResponse => { if (cachedResponse) { return cachedResponse; } return caches.open(RUNTIME).then(cache => { return fetch(event.request).then(response => { // Put … Continue reading Error handling for failed network requests with service workers
Book of dark arts: selective disclosure with CSS
Show and hide pages and page elements with declarative CSS instead of imperative code
Book of dark arts: storing data in the view
Pentagram, source Wikipedia. Towards the end of the year I'll indulge in the dark arts, join the goblins and leave my white architect hat under the Christmas tree where it belongs. I'm helping a friend (a technically minded, non-programmer) write his first mobile app . We wanted to keep everything simple: use technologies which can … Continue reading Book of dark arts: storing data in the view
Secure messaging in the browser
By observing news and public discussions I feel that there is a growing awareness of data privacy and an increasing demand for secure person-to-person communication. In order to address my communication needs, I plugged together a few Javascript libraries and started the Webencryption [1] project on Github. What is Webencryption? Webencryption is a rather crude … Continue reading Secure messaging in the browser
Unjam CSS
Abstract: Unjam CSS is a technique for removing render-blocking CSS from pages over which we have only partial control, such as CMS or portals. The problem: a portal generates HTML pages based on a template. Custom HTML can be inserted at specific place holders, but we can't modify the rest of the page HTML. The … Continue reading Unjam CSS
Equal height HTML elements in a container with CSS
Task: create HTML elements that contain other elements and adjust their height to surrounding container. No Javascript allowed.That's surprisingly hard; height:100% won't work; elements generally wrap their contents tightly and don't extend to their parents height dimension.Illustrating the problem: three elements inside a surrounding containerCss-tricks lists several ways [1] to get this done, two of … Continue reading Equal height HTML elements in a container with CSS
The jsp-file directive
The jsp-file directive in web.xml allows mapping of JSPs to concrete URLs: Shame on me, I didn't know about this. As seen here: http://mail-archives.apache.org/mod_mbox/tomcat-users/200107.mbox/%3CPine.BSF.4.21.0107271807540.7976-100000@localhost%3E
Spring @PathVariable mapping incomplete path when dots are included
In all my projects this happens at least once, and I'm surprised over and over again: a controller will not map just anything to @PathVariable by default. Contrary to intuition, the annotation's argument is a regular expression which excludes some characters per default. For instance the urlhttp://localhost:8080/myapp/api/user/testuser@example when mapped to a controller:@RequestMapping(value = "/api/user/{email}")ModelAndView findUserByEmail(@PathVariable("email") … Continue reading Spring @PathVariable mapping incomplete path when dots are included
On translating Tweets
I've been following the indonesian startup community for a while, but unfortunately my bahasa is not quite at the level that allows me to casually drop a glance at twitter and go on with my work. While looking for a solution to translate tweets into english for firefox, it turns out that there are a … Continue reading On translating Tweets
