How to identify the popup authentication scheme used in an URL?

I'm trying to extract information from an URL using my Java code. But the URL has a pop-up authentication scheme. How would I know the authentication scheme used? I have the credentials for 开发者_高级运维it.

A browser typically shows an authentication "popup" when the server responds to an HTTP request with a "401 Unauthorized" response message. The response header includes a "WWW-Authentication" header which tells you the authentication scheme to use (among other things).

There are various ways to deal with this in a Java application, depending on how you are attempting to fetch the web resource associated with the URL. For instance, if you are using HttpUrlConnection, you can extract the "WWW-Authentication" header, parse it, and extract the authentication scheme.

Normally the authentication is based on HTTP. There are several techniques to use (HTTP basic authentication Kerberos NTLM and so on) Each of this technologies applies additional information into HTTP header. So the authentification is not URL based but HTTP Header based.

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