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Head First Servlets and JSP, 2nd Edition by Bert Bates, Bryan Basham, Kathy Sierra

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Actually, one or more of the other HTTP Methods might make a (brief) appearance on the exam...

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If you’re preparing for the exam, you should be able to recognize all of them from a list, and have at least the briefest idea of what they’re used for. But don’t spend much time here!

Note

In the real servlet world, you care about GET and POST.

In the exam world, you care just a tiny bit about the other HTTP Methods as well.

GET

Asks to get the thing (resource / file) at the requested URL.

POST

Asks the server to accept the body info attached to the request, and give it to the thing at the requested URL It’s like a fat GET... a GET with extra info sent with the request.

HEAD

Asks for only the header part of whatever a GET would return. So it’s just like GET, but with no body in the response. Gives you info about the requested URL without actually getting back the real thing.

TRACE

Asks for a loopback of the request message, so that the client can see what’s being received on the other end, for testing or troubleshooting.

PUT

Says to put the enclosed info (the body) at the requested URL.

DELETE

Says to delete the thing (resource / file) at the requested URL.

OPTIONS

Asks for a list of the HTTP methods to which the thing at the requested URL can respond.

CONNECT

Says to connect for the purposes of tunneling.

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