Response codes fall under five categories:
Some of the most common you're likely to encounter within these categories are:
A full list of available response codes can be found in the W3 protocols.
Within the tool we've provided a list of common user agents so you can view how http responses may vary. Detecting user agents allows sites to tailor their response depending on the browser or device that is making the request. So for example, a site might detect the following user agent:
This tells the site that the user is browsing on an iPhone.
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