pub fn api_key_selection_expression(
            mut self,
            input: impl Into<std::string::String>,
        ) -> Self {
            self.api_key_selection_expression = Some(input.into());
            self
        }
/// <p>An API key selection expression. Supported only for WebSocket APIs. See <a href="https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-websocket-api-selection-expressions.html#apigateway-websocket-api-apikey-selection-expressions">API Key Selection Expressions</a>.</p>
An API key selection expression.
An API key selection expression .
pub fn api_key_selection_expression(
            mut self,
            input: impl Into<std::string::String>,
        ) -> Self {
            self.api_key_selection_expression = Some(input.into());
            self
        }
pub fn api_key_selection_expression ( mut self , input : impl Into < std :: string :: String > , ) -> Self { self . api_key_selection_expression = Some ( input . into ( ) ) ; self }
<p>An API key selection expression.
<p > An API key selection expression .
mut self
input
impl Into<std::string::String>
mut self
input
impl Into<std::string::String>