Metadrop: Improving headers in a Drupal site using Dries’ HTTP Header Analyzer
In a previous article I wrote about the importance of the HTTP headers and web security avoiding the technical stuff. In this article I want to get into all the dirty technical details.
Some time ago we came across the HTTP Header Analyzer by Dries Buytaert. This tool, as the name suggests, analyses the headers of the HTTP response from a website. There are other header analysers out there, but this one, published by the creator of Drupal, also takes into account Drupal-specific headers. The tool displays a report of all headers found, along with an explanation of the purpose of the header and notes on the values of the header, sometimes including recommendations for better values. It also displays information about missing headers that should be present.
With all this information, the tool gives a score based on the missing headers, warnings and notices detected during the analysis. On the first runs on our website, I have to admit that the score was not bad, but not good: 6/10. Now I am happy to say that we get a score of 10/10 on the home page. Unfortunately, not all pages can get the highest score, as I explain below.
