pub fn allowed_headers(mut self, input: impl Into<std::string::String>) -> Self {
            let mut v = self.allowed_headers.unwrap_or_default();
            v.push(input.into());
            self.allowed_headers = Some(v);
            self
        }
/// Appends an item to `allowed_headers`.
///
/// To override the contents of this collection use [`set_allowed_headers`](Self::set_allowed_headers).
///
/// <p>Headers that are specified in the <code>Access-Control-Request-Headers</code> header. These headers are allowed in a preflight OPTIONS request. In response to any preflight OPTIONS request, Amazon S3 returns any requested headers that are allowed.</p>
Appends an item to `allowed_headers`.
To override the contents of this collection use [`set_allowed_headers`](Self::set_allowed_headers).

Headers that are specified in the Access-Control-Request-Headers header. These headers are allowed in a preflight OPTIONS request. In response to any preflight OPTIONS request, Amazon S3 returns any requested headers that are allowed.
Appends an item to ` allowed_headers ` . To override the contents of this collection use [ ` set_allowed_headers ` ] ( Self :: set_allowed_headers ) . Headers that are specified in the Access - Control - Request - Headers header . These headers are allowed in a preflight OPTIONS request . In response to any preflight OPTIONS request Amazon S3 returns any requested headers that are allowed .
pub fn allowed_headers(mut self, input: impl Into<std::string::String>) -> Self {
            let mut v = self.allowed_headers.unwrap_or_default();
            v.push(input.into());
            self.allowed_headers = Some(v);
            self
        }
pub fn allowed_headers ( mut self , input : impl Into < std :: string :: String > ) -> Self { let mut v = self . allowed_headers . unwrap_or_default ( ) ; v . push ( input . into ( ) ) ; self . allowed_headers = Some ( v ) ; self }
Appends an item to `allowed_headers`.
Appends an item to ` allowed_headers ` .
mut self
input
impl Into<std::string::String>
mut self
input
impl Into<std::string::String>