如何通过本地客户端和服务器的访存API发出POST请求?

时间:2019-03-20 13:36:51

标签: javascript webpack fetch webpack-dev-server

我正在通过webpack和express运行两个单独的服务器;开发服务器和客户端服务器。

我在客户端上有一个按钮,我想在按钮单击时向服务器发送POST请求。我正在使用https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch

中的示例创建请求
const testButton = document.querySelector(`button.test`);

const sendRequest = event => {
    event.preventDefault(); //stop or prevents the browser from executing the default action

    postData(`http://localhost:8080/`, { answer: 42 }) // line:32
        .then(data => console.log(JSON.stringify(data))) // JSON-string from `response.json()` call , line:33
        .catch(error => console.error(error));

    function postData(url = ``, data = {}) {
        // Default options are marked with *
        return fetch(url, { // line:38
            method: 'POST', // *GET, POST, PUT, DELETE, etc.
            mode: 'no-cors', // no-cors, cors, *same-origin
            cache: 'no-cache', // *default, no-cache, reload, force-cache, only-if-cached
            credentials: 'same-origin', // include, *same-origin, omit
            headers: {
                'Content-Type': 'application/json',
                // "Content-Type": "application/x-www-form-urlencoded",
            },
            redirect: 'follow', // manual, *follow, error
            referrer: 'no-referrer', // no-referrer, *client
            body: JSON.stringify(data), // body data type must match "Content-Type" header
        });
        // .then(response => response.json()); // parses JSON response into native Javascript objects
    }

    console.log(`sends POST request from here`);
};
testButton.addEventListener(`click`, sendRequest);

当我单击按钮时,出现此错误:

sends POST request from here // console.log message in request
POST http://localhost:8080/ 404 (Not Found)
postData @ index.js:38
sendRequest @ index.js:32
index.js:33 {}

package.json中的脚本

    "scripts": {
        "start": "webpack",
        "dev-server": "nodemon bin/dev localhost 8080",
        "dev-client": "webpack-dev-server --port 3000"
    }

webpack.config.js中的devServer


    devServer: {
        historyApiFallback: true,
        hot: true,
        inline: true,

        host: 'localhost',
        port: 3000,
         proxy: {
          '/api/': 'http://localhost:8080',
          }
    },

我已经为代理尝试过

proxy: {
          '^/api/*': {
            target: 'http://localhost:8080/api/',
            secure: false
          }
        }

1 个答案:

答案 0 :(得分:0)

  1. 您是否启动了快递服务器?
  2. 您的快速应用程序是否有空的端点映射(它也必须是POST映射)?
  3. 如果您使用的是docker(用于快递),它会监听您的内部端口吗?

乍一看,您的请求代码看起来不错。