Method cache

http-cache/src/error.rs:95–97

Create a cache operation error # Examples ```rust use http_cache::HttpCacheError; let err = HttpCacheError::cache("Cache entry not found"); ```

(message: S)

    /// let err = HttpCacheError::cache("Cache entry not found");
    /// ```
    pub fn cache<S: Into<String>>(message: S) -> Self {
        Self::Cache(message.into())
    }

    /// Create an HTTP processing error
    ///