# File lib/rack/utils.rb, line 112
112:     def build_nested_query(value, prefix = nil)
113:       case value
114:       when Array
115:         value.map { |v|
116:           build_nested_query(v, "#{prefix}[]")
117:         }.join("&")
118:       when Hash
119:         value.map { |k, v|
120:           build_nested_query(v, prefix ? "#{prefix}[#{escape(k)}]" : escape(k))
121:         }.join("&")
122:       when String
123:         raise ArgumentError, "value must be a Hash" if prefix.nil?
124:         "#{prefix}=#{escape(value)}"
125:       else
126:         prefix
127:       end
128:     end