What causes directive templates to be fetched from the server at times (resulting in a 304 response), while other times they are retrieved from the browser cache without

I've noticed that when I reload the page, Angular directive templates load in two different ways. The first way is when the browser sends a request to the server and receives a 304 response - everything works fine.

However, the second way is puzzling me because the browser doesn't make a request at all. I'm unsure why this happens.

The issue arises when I make changes to templates in the first group, as those changes appear after the next page reload. However, changes in templates from the second group do not show up. It's quite frustrating.

My question now is: how can I ensure that the browser sends a request to the server for each template?

Answer №1

It appears that the response headers for templates do not contain any Cache-Control directives. In this scenario, a browser will rely on heuristic methods to determine how long a response should be cached.

To address the issue of always fetching fresh templates during development, you can take the following steps:

  • Enable "Disable cache" in developer tools
  • Add a proper Cache-Control header for specific resources, such as:

    Cache-Control: no-cache

If you wish to gain insights into the different behaviors triggered by various Cache-Control values, I recommend reading this informative article by Ilya Grigorik.

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