Continues an observable sequence that is terminated by an exception with the next observable sequence. There is an alias for this method
catchException for browsers <IE9
Observable): A second observable sequence used to produce results when an error occurred in the first sequence.
Function): Exception handler function that returns an observable sequence given the error that occurred in the first sequence
Observable): An observable sequence containing the first sequence's elements, followed by the elements of the handler sequence in case an exception occurred.