我试图让我的React-Redux应用程序通过Axios与我部署的Heroku API进行通信。
当我尝试通过Axios向我的Heroku服务器发出POST请求时,我在Chrome开发人员工具的控制台中收到此错误消息:
正如您在screencap中看到的那样,我在请求的资源上出现“No'Access-Control-Allow-Origin'标头。”以及503的错误状态代码。
而我觉得奇怪的是我的/register
请求被解雇了两次。这是正常的吗?
以下是我的后端代码中app.js
文件中的配置,用于启用跨域请求:
app.use(function (req, res, next) {
res.header("Access-Control-Allow-Origin", '*');
res.header("Access-Control-Allow-Credentials", true);
res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE,PATCH,OPTIONS');
res.header("Access-Control-Allow-Headers", "Access-Control-Allow-Headers,Access-Control-Allow-Methods,Access-Control-Allow-Origin,Origin,X-Auth,X-Requested-With,Content-Type,Accept,content-type,application/json,x-auth,Access-Control-Request-Method,Access-Control-Request-Headers");
next();
});
这里是Axios代码,它在我的前端对服务器进行API调用:
import axios from 'axios'
export function register(fields) {
console.log('below are the fields');
console.log(fields);
return function action(dispatch) {
let objArrSkills = Object.keys(fields.form_skills);
let skillsArr = objArrSkills.map(function (value) {
if (fields.form_skills[value] === true && fields.form_skills[value] !== undefined) {
return value;
}
});
let objArrArts = Object.keys(fields.form_arts);
let artsArr = objArrArts.map(function (value) {
if (fields.form_arts[value] === true && fields.form_arts[value] !== undefined) {
return value;
}
});
console.log('artsArr is...' + artsArr);
console.log('skillsArs is...' + skillsArr);
const request = axios({
method: 'post',
url: "https://jammr-backend.herokuapp.com/register",
data: {
firstName: fields.form_first_name,
lastName: fields.form_last_name,
email: fields.form_email,
password: fields.form_password,
skills: skillsArr,
iWantToMake: artsArr,
street: fields.form_address,
city: fields.form_city,
provinceState: fields.form_province,
gender: fields.form_gender,
imLookingFor: ['Acting', 'Drawing', 'Music', 'Writing', 'Programming', 'Videography']
},
headers: {
'Content-Type': 'application/x-www-form-urlencoded',
'Access-Control-Allow-Origin': '*',
'Access-Control-Allow-Headers': "Access-Control-Allow-Headers,Access-Control-Allow-Methods,Access-Control-Allow-Origin,Origin,X-Auth,X-Requested-With,Content-Type,Accept,content-type,application/json,x-auth,Access-Control-Request-Method,Access-Control-Request-Headers",
'Access-Control-Allow-Methods': 'GET,PUT,POST,DELETE,PATCH,OPTIONS'
}
});
return request.then(response => {
console.log('axios call ran! Below is response....');
console.log(response);
dispatch({
type: 'REGISTER',
payload: {
myId: response.data,
fields: fields,
skills: skillsArr,
iWantToMake: artsArr
}
})
},
err => {
if (err) throw err;
})
}
};
我的代码有什么问题吗?这是我在Github上的front-end和back-end代码。
如果它是相关的,我的后端部署在Heroku上。此外,我确实尝试使用cors npm包,但它没有用。
我愿意打赌你从heroku堆栈中得到了503,因为你的后端存在一些问题。 (也许超时?)显然,Heroku堆栈不会添加交叉原点标头,这就是为什么你在JS控制台中看到交叉原点错误的原因。你可以发布你的服务器日志吗?