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Is it possible to add a 404 Not Found error message to a page so that Google Crawler knows that it’s a non-existent page, when output is already made to the browser?
Using the code below is not an option, since it results in a “Can not modify headers” error:
header("HTTP/1.0 404 Not Found");
No.
Headers are always sent before data (hence the name ;-))
Send the header before any data and you are set.