18. One or more non-transitory computer readable storage media storing computer-executable instructions for performing a computer process, the computer process comprising: receiving a request by a client device to access a first content that is not available from a first Web domain; identifying 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 the first content that is not available based on the at least one interest keyword; identifying 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 transmitting the at least one interest keyword to a server of the second Web domain, wherein the second Web domain serves second content similar to the first content and associated with the interest keyword to the user.
18. One or more non-transitory computer readable storage media storing computer-executable instructions for performing a computer process, the computer process comprising: receiving a request by a client device to access a first content that is not available from a first Web domain; identifying 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 the first content that is not available based on the at least one interest keyword; identifying 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 transmitting the at least one interest keyword to a server of the second Web domain, wherein the second Web domain serves second content similar to the first content and associated with the interest keyword to the user. 22. The one or more computer readable storage media of claim 18 , wherein the user's keyword search results are obtained from the user's entry of one or more search keywords into a search engine.