How to identify Http request and response header online ?

Recently we wanted to make sure some of our URL’s return 404 error code when user doesn’t find that link. So, to test this we were looking for some online tool which could show us http request and responses headers and we can test to see if our URL returns 404 error code.

This is very easily can be tested using web-sniffer.net website, just enter your URL and click submit button. You can also select the test browser from the “User Agent” option,

This is how our test page, which doesn’t exist on this website shows the result,

404 error

Test your webpage at http://web-sniffer.net/

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