pub fn content_len(&self) -> Option<usize> {
        self.inner.headers()
                  .get(header::CONTENT_LENGTH)
                  .and_then(|header| header.to_str().ok())
                  .and_then(|header| header.parse().ok())
    }
///Retrieves length of content to receive, if `Content-Length` exists.
Retrieves length of content to receive, if `Content-Length` exists.
Retrieves length of content to receive if ` Content - Length ` exists .
pub fn content_len(&self) -> Option<usize> {
        self.inner.headers()
                  .get(header::CONTENT_LENGTH)
                  .and_then(|header| header.to_str().ok())
                  .and_then(|header| header.parse().ok())
    }
pub fn content_len ( & self ) -> Option < usize > { self . inner . headers ( ) . get ( header :: CONTENT_LENGTH ) . and_then ( | header | header . to_str ( ) . ok ( ) ) . and_then ( | header | header . parse ( ) . ok ( ) ) }
Retrieves length of content to receive, if `Content-Length` exists.
Retrieves length of content to receive if ` Content - Length ` exists .
&self