What is happening in production? Distributed tracing can help you find out. But it’s one thing to instrument, another to use it. Here’s a short (6m) video that asks “Why is this so slow?” See three quick ways to get answers in Honeycomb. If you want to follow along and play with the same data …
When I’m developing on a Spring Boot app, I want to see when a request comes in, how it was authenticated, and where it was handled. By default, log levels are set to INFO. Nothing prints per-request. I don’t know a good way to get the information I need, so I turn them way up: …
^ that’s what I googled, so that’s the title of the blog post that solves it. When I added spring-boot-starter-security to my dependencies, I expected my whole app to suddenly be behind a login screen. But I expected it to work after logging in. Instead, it failed at the first form submission. And it failed …
Read moreI turned on Spring Security and my POSTs don’t work anymore
Useful terminology: my tools are either ready-to-hand, unready-to-hand, or present-at-hand. I can notice the switch and deal with it consciously.
In our Rails app, installing the Honeycomb beeline magically gave us traces of all HTTP requests, with dozens of useful fields like ‘request.path’ and ‘response.status_code’. I really wanted the request verb (GET or POST) and I couldn’t find that. (It’s there, in ‘request.method’, I missed it. But still, it’s useful to know how to a …
Read moreAdding custom fields to Honeycomb traces in Rails by writing a Rack middleware
All I want is a web page. I want this one thing on the left and this other thing on the right — why is this so hard?? Can I just make a table in HTML like I used to do in the nineties? Why do I have to worry about stylesheets? and, why are …
or, a week in the life of a programmer Lately I’m working on our documentation. We write it in markdown, turn it into a web site, and then serve it from s3. To turn it into a web site, we use mkdocs and the material theme for mkdocs. Mkdocs is written in Python. Then we …
At elm-conf and CodeMesh and YOW! Australia this year, I did live demos using automated code modification with Atomist Rug. Rug is now officially open source, and the Rug CLI is available so that you can try (and change! and improve!) these editors on your own Elm code. This blog post tells you how. I usually start …
This one expresses some of the principles behind the Elm language, which is specific to single-page web apps. Elm makes it hard to make a dumb mistake, because it is easy to find all the places you need to change. More important: it teaches you a rigorous way to think about flow through the application. …