Investigate problems due to User-Agent using Bash

Last week we had some problems with the Google Ads bot. It was not able to crawl a bunch of URLs while the browser had no problem getting through. The only difference was the User-Agent. This send us on a debugging journey through Cloudflare, gateways and micro-sites. To assist us, we’ve created a small bash script to visit an URL and show some debug info.

Misc, Tools

My Little List of Tools for Prototyping

As a developer I love to prototype to see if an idea works. Thinking big and starting small is actually one of Wehkamp’s principles. And, let’s face it, that’s not easy!

Usually it starts by getting an idea of the core concept that should be validated. Especially when working with teams, communication is key. This list of tools helped me over the years to draw or code out some of these concepts and get a discussion started.

Every tool on this list is free and online.

Automation, AWS Lambda

AWS Lambda Size: PIL+TF+Keras+Numpy?

At Wehkamp we’ve been using machine learning for a while now. We’re training models in Databricks (Spark) and Keras. This produces a Keras file that we use to make the actual predictions. Training is one thing, but getting them to production is quite another!

The main problem we’ve faced was that it was too big to actually fit into a lambda. This blogs shows how we’ve dealt with that problem.

.NET, Redis

Building a high performing last viewed list using Redis

We live in a day and age in which we can choose a data-store that matches the characteristics of our apps and (micro) services. Lately we’ve been looking into Redis as a high performing store for last viewed items. In this blog I’ll look show how to create a POC with the redis-cli and then implement it using .NET Core. We’ll be using the sorted set structure.

Automation, PowerShell, Windows

PowerShell snippet: check if software is installed

Some deployment scripts need to check if certain required software is installed on a Windows Machine. You could check if the file is present at a certain location, but there is a better way to check if software is installed: the uninstall database in the Windows Registry. PowerShell makes it really easy to query the registry!


Swap alt and cmd in Windows 10 (MacBook Pro)

As a .Net Developer, I need my MacBook Pro to run Windows. I did so using Boot Camp (which was okay, but my mouse wouldn’t scroll) In Windows I use alt+tab a lot. But the cmd and alt keys are not in the right place (from a Windows keyboard perspective). I use the Windows key a lot too (like Windows+r for run). So let’s swap those keys!

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