+ encodeText = toURLEncoded ∘ encodeUtf8
+
+toURLEncoded ∷ BS.ByteString → BS.ByteString
+{-# INLINEABLE toURLEncoded #-}
+toURLEncoded = C8.concatMap go
+ where
+ go ∷ Char → BS.ByteString
+ {-# INLINE go #-}
+ go c | c ≡ ' ' = C8.singleton '+'
+ | isReserved c = urlEncode c
+ | isUnreserved c = C8.singleton c
+ | otherwise = urlEncode c
+
+ urlEncode ∷ Char → BS.ByteString
+ {-# INLINE urlEncode #-}
+ urlEncode c = C8.pack ('%':toHex (ord c))
+
+ toHex ∷ Int → String
+ {-# INLINE toHex #-}
+ toHex n
+ = case showIntAtBase 16 toChrHex n "" of
+ [] → "00"
+ [c] → ['0', c]
+ cs → cs
+
+ toChrHex ∷ Int → Char
+ {-# INLINE toChrHex #-}
+ toChrHex d
+ | d < 10 = chr (ord '0' + fromIntegral d )
+ | otherwise = chr (ord 'A' + fromIntegral (d-10))