+tokio = { version = "1.0", features = [ "io-util", "net" ], optional = true }
+serde = { version = "1.0", features = ["derive"], optional = true }
+serde_json = { version = "1.0", optional = true }
+chunked_transfer = { version = "1.4", optional = true }
+futures = { version = "0.3" }
+
+[dev-dependencies]
+tokio = { version = "1.0", features = [ "macros", "rt" ] }