interface http-client {    /// An HTTP request.    record http-request {        /// The HTTP method for the request.        method: http-method,        /// The URL to which the request should be made.        url: string,        /// The headers for the request.        headers: list<tuple<string, string>>,        /// The request body.        body: option<list<u8>>,        /// The policy to use for redirects.        redirect-policy: redirect-policy,    }     /// HTTP methods.    enum http-method {        /// `GET`        get,        /// `HEAD`        head,        /// `POST`        post,        /// `PUT`        put,        /// `DELETE`        delete,        /// `OPTIONS`        options,        /// `PATCH`        patch,    }     /// The policy for dealing with redirects received from the server.    variant redirect-policy {        /// Redirects from the server will not be followed.        ///        /// This is the default behavior.        no-follow,        /// Redirects from the server will be followed up to the specified limit.        follow-limit(u32),        /// All redirects from the server will be followed.        follow-all,    }     /// An HTTP response.    record http-response {        /// The response headers.        headers: list<tuple<string, string>>,        /// The response body.        body: list<u8>,    }     /// Performs an HTTP request and returns the response.    fetch: func(req: http-request) -> result<http-response, string>;     /// An HTTP response stream.    resource http-response-stream {        /// Retrieves the next chunk of data from the response stream.        ///        /// Returns `Ok(None)` if the stream has ended.        next-chunk: func() -> result<option<list<u8>>, string>;    }     /// Performs an HTTP request and returns a response stream.    fetch-stream: func(req: http-request) -> result<http-response-stream, string>;}