In one embodiment, a method includes receiving a request for a target structured document. In a first response phase, the method includes accessing a data structure comprising an entry for the target structured document and one or more first resources associated with the target structured document, generating a first response portion including a first portion of the target structured document including one or more of the first resources or references for one or more of the first resources, and transmitting the first response portion to the client. The method further includes, in a second response phase, generating a second response portion that includes a second portion of the target structured document including one or more of: one or more second resources, or references for the one or more second resources, associated with the target structured document; and structured document language code, and transmitting the second response portion to the client.