Tänane küsimuste ja vastuste seanss jõuab meile viisakalt SuperUserini - Stack Exchange'i ja kogukonnapõhiste Q & A veebisaitide rühmitusse.
Kuumad fotod on Cory M. Grenier (Flickr).
Küsimus
SuperUseri lugeja Joseph A. soovib teada, kuidas veebiserverid saavad öelda, kas kasutate otseseid IP-aadresse või mitte:
Some web servers, when accessed using their IP address, return an error that direct IP address access is not allowed. I have been wondering for some time how this works.
Does a browser always resolve the IP address and connect to it? Direct IP address access is just skipping DNS altogether, right? How does a remote server even know that you skipped DNS?
Kuidas veebiserverid teavad, kas kasutate otse IP-aadressi või mitte?
Vastus
SuperUseri kaasautor iAdjunctil on meile vastus:
To answer your question of how it knows, it has to do with what your browser sends the web server. You are right that the system always resolves it to an IP address, but the browser sends the URL you attempted to access in the HTTP header.
Here is a sample header that I found online, modified to look as though you used Firefox on Windows and typed apple.com into the address bar:
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