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// Start with an empty db.

URL with("http://localhost:8080/?action=select&op=pairs") fetch
// ==> []
URL with("http://localhost:8080/dir1?action=mkdir") fetch
URL with("http://localhost:8080/dir1/?action=write&key=k1") post("k1_val")
URL with("http://localhost:8080/?action=select&op=pairs") fetch
// ==> [["dir1",{"k1":"k1_val"}]]

// Now create a key and an empty container
URL with("http://localhost:8080/?action=write&key=k") post("k_val")
URL with("http://localhost:8080/?action=select&op=pairs") fetch
// ==> [["dir1",{"k1":"k1_val"}],["k",{}]]
URL with("http://localhost:8080/?action=read&key=k") fetch
// ==> "k_val"
URL with("http://localhost:8080/dir2?action=mkdir") fetch

// Can't tell the difference between a key and an empty container:
URL with("http://localhost:8080/?action=select&op=pairs") fetch
// ==> [["dir1",{"k1":"k1_val"}],["dir2",{}],["k",{}]]