Enable middleware to only apply to specific url patterns

[covert holly]

How can I create a middleware that ignores certain URL patterns, like .favicon or assets in /public?

[spice adder]

Hi @covert holly. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

---

Astro does not provide a direct way to ignore certain URL patterns in middleware. However, you can achieve this by adding a condition in your middleware function to check the URL and skip the middleware logic for certain patterns.

Here's an example of how you can do this:

export const onRequest = async (context, next) => {
  // Skip middleware for certain URL patterns
  if (context.url.pathname.startsWith('/public') || context.url.pathname.endsWith('.favicon')) {
    return next();
  }

  // Your middleware logic here
  const response = await next();
  const html = await response.text();
  const redactedHtml = html.replaceAll("PRIVATE INFO", "REDACTED");

  return new Response(redactedHtml, {
    status: 200,
    headers: response.headers
  });
};

In this example, the middleware logic is skipped if the URL starts with '/public' or ends with '.favicon'. You can replace these conditions with your own URL patterns.

Please note that this is a general approach and might need to be adjusted based on your specific use case and the structure of your Astro project.

For more information on how to use middleware in Astro, you can refer to the Astro documentation (https://docs.astro.build/en/guides/middleware/#example-redacting-sensitive-information).

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