9. A method comprising: receiving, by a server, a request from a client device to access a first content that is not available from a first Web domain; identifying, by the server, at least one interest keyword based on a combination of keywords that yield search results including the first Web domain and a user's clickstream data responsive to the search results; classifying, by the server, the first content that is not available based on the at least one interest keyword; identifying, by the server, a second web domain based on historical relevance data and the classification of the first content that is not available, the historical relevance data including one or more previous attempts to access the first Web domain and session data representing activity performed with respect to the first Web domain; and providing the user access to second content similar to the first content from the second Web domain using the identified at least one keyword.
9. A method comprising: receiving, by a server, a request from a client device to access a first content that is not available from a first Web domain; identifying, by the server, at least one interest keyword based on a combination of keywords that yield search results including the first Web domain and a user's clickstream data responsive to the search results; classifying, by the server, the first content that is not available based on the at least one interest keyword; identifying, by the server, a second web domain based on historical relevance data and the classification of the first content that is not available, the historical relevance data including one or more previous attempts to access the first Web domain and session data representing activity performed with respect to the first Web domain; and providing the user access to second content similar to the first content from the second Web domain using the identified at least one keyword. 11. The method of claim 9 , wherein the second content of the second Web domain includes an advertisement that is determined to be relevant to the at least one interest keyword.