Default implementation of
UserTokenHandler. This class will use
an instance of Principal as a state object for HTTP connections,
if it can be obtained from the given execution context. This helps ensure
persistent connections created with a particular user identity within
a particular security context can be reused by the same user only.
DefaultUserTokenHandler will use the user principle of connection
based authentication schemes such as NTLM or that of the SSL session
with the client authentication turned on. If both are unavailable,
null token will be returned.
The token object returned by this method is expected to uniquely identify the current user if the context is user specific or to be
|From class java.lang.Object|
|From interface org.apache.http.client.UserTokenHandler|
The token object returned by this method is expected to uniquely
identify the current user if the context is user specific or to be
null if it is not.
|context||the execution context|
null if the context is not user specific.