Just a nit, but the syntax for query arguments would be: "http://www.documentcloud.org/documents/21939/search.json http://www.documentcloud.org/documents/21939/

Just a nit, but the syntax for query arguments would be: "http://www.documentcloud.org/documents/21939/search.json http://www.documentcloud.org/documents/21939/search.json{?q}"