怎样从Express API发送一致的错误响应

< HTTP/1.1 400 Bad Request< Content-Type: text/html; charset=utf-8< Content-Length: 138< Date: Wed, 28 Oct 2020 20:11:07 GMT

res.status(400).end();

npm install http-errors

const createHttpError = require("http-errors");

const error = createHttpError(400, "Invalid filter");

const error = new Error("Invalid filter");const httpError = createHttpError(400, error);

const error = createHttpError(400, "Invalid filter", {    headers: {        "X-Custom-Header": "Value"    }});

const error = new createHttpError.BadRequest("Invalid filter");

{    message: "Invalid filter",    // This statusCode property is going to come in very handy!    statusCode: 400,    stack: `BadRequestError: Invalid filter        at /home/simonplend/dev/express-error-responses/app.js:33:17        at Layer.handle [as handle_request] (/home/simonplend/dev/express-error-responses/node_modules/express/lib/router/layer.js:95:5)        at next (/home/simonplend/dev/express-error-responses/node_modules/express/lib/router/route.js:137:13)`}

BadRequestError: Invalid sort parameter, must be either: first_name, last_name    at /home/simonplend/dev/express-error-responses/app.js:17:17    at Layer.handle [as handle_request] (/home/simonplend/dev/express-error-responses/node_modules/express/lib/router/layer.js:95:5)    at next (/home/simonplend/dev/express-error-responses/node_modules/express/lib/router/route.js:137:13)    at Route.dispatch (/home/simonplend/dev/express-error-responses/node_modules/express/lib/router/route.js:112:3)    at Layer.handle [as handle_request] (/home/simonplend/dev/express-error-responses/node_modules/express/lib/router/layer.js:95:5)    at /home/simonplend/dev/express-error-responses/node_modules/express/lib/router/index.js:281:22    at Function.process_params (/home/simonplend/dev/express-error-responses/node_modules/express/lib/router/index.js:335:12)    at next (/home/simonplend/dev/express-error-responses/node_modules/express/lib/router/index.js:275:10)    at expressInit (/home/simonplend/dev/express-error-responses/node_modules/express/lib/middleware/init.js:40:5)    at Layer.handle [as handle_request] (/home/simonplend/dev/express-error-responses/node_modules/express/lib/router/layer.js:95:5)

const express = require("express");/** * We'll be using this library to help us create errors with * HTTP status codes. */const createHttpError = require("http-errors");/** * In a real application this would run a query against a * database, but for this example it's always returning a * rejected `Promise` with an error message. */function getUserData() {    return Promise.reject(        "An error occurred while attempting to run the database query."    );}/** * Express configuration and routes */const PORT = 3000;const app = express();/** * This example route will potentially respond with two * different types of error: *  * - 400 (Bad Request) - The client has done something wrong. * - 500 (Internal Server Error) - Something has gone wrong in your application. */app.get("/user", (request, response, next) => {    const validSort = ["first_name", "last_name"];    const sort = request.query.sort;    const sortIsValid = sort && validSort.includes(sort);    if (!sortIsValid) {        /**         * This error is created by specifying a numeric HTTP status code.         *          * 400 (Bad Request) - The client has done something wrong.         */        const error = new createHttpError.BadRequest(            `Invalid sort parameter, must be either: ${validSort.join(", ")}`        );        /**         * Because we're passing an error object into the `next()` function,         * the default error handler in Express will kick in and take         * care of sending an error response for us.         *          * It's important that we return here so that none of the         * other code in this route handler function is run.         */        return next(error);    }    getUserData()        .then(userData => response.json(userData))        .catch(error => {            /**             * This error is created by using a named HTTP error constructor.             *             * An existing error is being passsed in and extra headers are             * being specified that will be sent with the response.             *             * 500 (Internal Server Error) - Something has gone wrong in your application.             */            const httpError = createHttpError(500, error, {                headers: {                    "X-Custom-Header": "Value",                }            });            /**             * Once again, the default error handler in Express will kick             * in and take care of sending an error response for us when             * we pass our error object to `next()`.             *              * We don't technically need to return here, but it's             * good to get into the habit of doing this when calling             * `next()` so you don't end up with weird bugs where             * an error response has been sent but your handler function             * is continuing to run as if everything is ok.             */            return next(httpError);        });});app.listen(PORT, () =>    console.log(`Example app listening at http://localhost:${PORT}`));