Method insert

dubbo/src/invocation.rs:182–185

(mut self, key: String, value: String)

    }

    pub fn insert(mut self, key: String, value: String) -> Self {
        self.inner.insert(key, value);
        self
    }

    pub fn from_headers(headers: http::HeaderMap) -> Self {
        let mut h: HashMap<String, String> = HashMap::new();