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Editorial Team
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Asked: 2026-05-30T01:35:10+00:00

Firebug shows some requests in Gray(screenshot attached and marked in Red) with status code

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Firebug shows some requests in Gray(screenshot attached and marked in Red) with status code 200 and some requests shows black with status code 200. What is the difference between two requests?

firebug output

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1 Answer

  1. Editorial Team

    The gray requests are the ones loaded from the cache, as described in a feature-promo here:

    http://getfirebug.com/network

    Cached or not cached

    Not all network requests are equal – some of them are loaded from the browser cache instead of the network. Firebug provides status codes for every request so you can quickly scan and see how effectively your site is using the cache to optimize page load times.

    Edit
    As for your concern regarding 200-codes and 304 codes, they also display this image on their website next to the above quote.

    enter image description here

    In other words, it would seem as if 200 still means that it is loaded from the cache. I do agree that it’s a bit strange. I’m trying to uncover more details.

    Edit 2
    I would assume that the server sends out 200-codes, but the browser chooses to ignore them and run the cached content anyway (perhaps by assuming it didn’t change, or perhaps because the new page loaded is in the same directory as the old one?).

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