CORS标头"Access Control Allow Origin"缺少REACT

我正在spring-boot之上构建一个react应用程序。当我试图向localhost:8080 发出put请求时，我的浏览器上出现了这些错误

阻止跨来源请求：同源策略不允许读取位于的远程资源http://localhost:8080/products.(原因：缺少CORS标头"Access Control Allow Origin"(。

阻止跨来源请求：同源策略不允许读取位于的远程资源http://localhost:8080/products.(原因：CORS请求未成功(

我已经在服务器端为localhost3000设置了@CrossOrigin。

一段时间以来，我一直试图通过添加标头、代理，甚至在任何地方使用firefox CORS来解决这个问题。似乎什么都不起作用。

请在下方查看我的前端代码

import React, { Component } from "react";
import { Card, Form, Button } from "react-bootstrap";
import axios from "axios";
import Toasting from "./Toasting";
export default class AddProducts extends Component {
constructor(props) {
super(props);
this.state = this.startState;
this.state.toast = false;
this.productChange = this.productChange.bind(this);
this.submitProduct = this.submitProduct.bind(this);
var config = {
headers: {'Access-Control-Allow-Origin': '*'}
};
}
startState = { id: "", name: "", brand: "", made: "", price: "" };
componentDidMount() {
const productId = this.props.match.params.id;
if (productId) {
this.findProductById(productId);
}
}
findProductById = (productId) => {
axios
.get("http://localhost:8080/products/" + productId)
.then((response) => {
if (response.data != null) {
this.setState({
id: response.data.id,
name: response.data.name,
brand: response.data.brand,
made: response.data.madein,
price: response.data.price,
});
}
})
.catch((error) => {
console.error("Error has been caught: " + error);
console.log(error);
});
};
reset = () => {
this.setState(() => this.startState);
};
submitProduct = (event) => {
//Prevent default submit action
event.preventDefault();
const product = {
id: this.state.id,
name: this.state.name,
brand: this.state.brand,
madein: this.state.made,
price: this.state.price,
};

axios.post("http://localhost:8080/products", product)
.then((response) => {
if (response.data != null) {
this.setState({ toast: true });
setTimeout(() => this.setState({ toast: false }), 3000);
} else {
this.setState({ toast: false });
}
});
this.setState(this.startState);
};
productChange = (event) => {
this.setState({
[event.target.name]: event.target.value,
});
};
productList = () => {
return this.props.history.push("/");
};
updateProduct = event => {
//Prevent default submit action
event.preventDefault();
const product = {
id: this.state.id,
name: this.state.name,
brand: this.state.brand,
madein: this.state.made,
price: this.state.price,
};
***************THIS IS WHERE THE ERROR IS**********************************************
axios.put("http://localhost:8080/products", product, this.config).then((response) => {
if(response.data != null) {
this.setState({ toast: true });
setTimeout(() => this.setState({ toast: false }), 3000);
setTimeout(() => this.productList(), 3000);
} else {
this.setState({ toast: false });
}
});
this.setState(this.startState);
};
render() {
const { name, brand, made, price } = this.state;
return (
<div>
<div style={{ display: this.state.toast ? "block" : "none" }}>
<Toasting
toast={this.state.toast}
message={"Product has been successfully saved!!!"}
type={"success"}
/>
</div>
<Card className={"border border-dark bg-dark text-white"}>
<Card.Header align="center">
{" "}
{this.state.id ? "Update a Product" : "Add a Product"}
</Card.Header>
<Form
onSubmit={this.state.id ? this.updateProduct : this.submitProduct}
id="productFormId"
onReset={this.reset}
>
<Card.Body>
<Form.Row>
<Form.Group controlId="formGridName">
<Form.Label>Product Name</Form.Label>
<Form.Control
required
autoComplete="off"
type="text"
name="name"
value={name}
onChange={this.productChange}
required
autoComplete="off"
className={"bg-dark text-white"}
placeholder="Enter Product Name"
/>
</Form.Group>
</Form.Row>
<Form.Row>
<Form.Group controlId="formGridBrand">
<Form.Label>Brand</Form.Label>
<Form.Control
required
autoComplete="off"
type="text"
name="brand"
value={brand}
onChange={this.productChange}
className={"bg-dark text-white"}
placeholder="Enter Brand Name"
/>
</Form.Group>
</Form.Row>
<Form.Row>
<Form.Group controlId="formGridMade">
<Form.Label>Made</Form.Label>
<Form.Control
required
autoComplete="off"
type="text"
name="made"
value={made}
onChange={this.productChange}
className={"bg-dark text-white"}
placeholder="Made in"
/>
</Form.Group>
</Form.Row>
<Form.Row>
<Form.Group controlId="formGridPrice">
<Form.Label>Price</Form.Label>
<Form.Control
required
autoComplete="off"
type="text"
name="price"
value={price}
onChange={this.productChange}
className={"bg-dark text-white"}
placeholder="Product Price"
/>
</Form.Group>
</Form.Row>
</Card.Body>
<Card.Footer>
<Button size="sm" variant="success" type="submit">
{this.state.id ? "Update" : "Submit"}
</Button>{" "}
<Button size="sm" variant="info" type="reset">
Undo
</Button>{" "}
<Button
size="sm"
variant="info"
type="button"
onClick={this.productList.bind()}
>
Products
</Button>
</Card.Footer>
</Form>
</Card>
</div>
);
}
}

请参阅下面的产品控制器类服务器端

package ie.sw.spring;
import java.util.List;
import java.util.NoSuchElementException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.bind.annotation.CrossOrigin;

@RestController
@CrossOrigin("http://localhost:3000")
public class ProductController {
@Autowired
private ProductService service;
@GetMapping("/products")
public List<Product> list() {
return service.listAll();
}
// Get products by their id
@GetMapping("/products/{id}")
public ResponseEntity<Product> get(@PathVariable Long id) {
try {
Product product = service.get(id);
return new ResponseEntity<Product>(product, HttpStatus.OK);
} catch (NoSuchElementException e) {
return new ResponseEntity<Product>(HttpStatus.NOT_FOUND);
}
}
// Handle post requests
@PostMapping("/products")
public void add(@RequestBody Product product) {
service.save(product);
}
// Update a product
@PutMapping("/products/{id}")
public ResponseEntity<?> update(@RequestBody Product product, @PathVariable Long id) {
try {
Product existProduct = service.get(id);
service.save(product);
return new ResponseEntity<>(HttpStatus.OK);
} catch (NoSuchElementException e) {
return new ResponseEntity<>(HttpStatus.NOT_FOUND);
}
}

@DeleteMapping("/products/{id}")
public void delete(@PathVariable Long id) {
service.delete(id);
}
}

***************THIS IS WHERE THE ERROR IS**********************************************
axios.put("http://localhost:8080/products", product, this.config).then((response) => {
...
}
@PutMapping("/products/{id}")
public ResponseEntity<?> update(@RequestBody Product product, @PathVariable Long id) {
...
}

我认为您在使用axios.put创建请求时错过了路径变量。要么应该删除@PathVariable Long id，要么必须在请求中传递id。

Option 1
axios.put("http://localhost:8080/products/" + productId, product, this.config).then((response) => {
...
}
@PutMapping("/products/{id}")
public ResponseEntity<?> update(@RequestBody Product product, @PathVariable Long id) {
...
}

Option 2
axios.put("http://localhost:8080/products", product, this.config).then((response) => {
...
}
@PutMapping("/products")
public ResponseEntity<?> update(@RequestBody Product product) {
...
}

此外，将@CrossOrigin更改为以下

@CrossOrigin(origins = "http://localhost:3000", methods = {RequestMethod.OPTIONS, RequestMethod.GET, RequestMethod.POST, RequestMethod.PUT, RequestMethod.DELETE}, allowedHeaders = "*", allowCredentials = "true")

你也可以看看这里

是否尝试将"proxy": "http://localhost:8080"添加到package.json文件中。这对我有帮助。我也有同样的问题。

@CrossOrigin("http://localhost:3000"(

错误，请尝试

@CrossOrigin("；http://localhost:8080"(

我已经在服务器端为localhost3000设置了@CrossOrigin。

阻止跨来源请求：同源策略不允许读取上的远程资源http://localhost:8080/产品。(原因：CORS缺少标头"Access Control Allow Origin"(。

您的错误是针对localhost:8080。

解决方案：

在服务器端localhost:8080中设置
不建议您在服务器端设置*设置所有url
或者另一种解决方案是将前端应用程序中的端口更改为一个你放在背后的

如果您只是尝试在本地运行，您尝试过chrome插件吗？

https://chrome.google.com/webstore/detail/allow-cors-access-control/lhobafahddgcelffkeicbaginigeejlf

两个可能的答案：

在WebConfig文件中配置cors。来自spring文档

您的方法如下：

public void addCorsMappings(CorsRegistry registry) {
registry.addMapping("/**")
.allowedOrigins("https://localhost:3000/**")
.allowedMethods("PUT", "DELETE","GET","POST");
// Add more mappings...
}

为了测试，请将@CrossOrigin更改为所有原点：
@交叉原点(原点=*(

如果它有效，那么它只是某个地方的一个细节。你能测试一下并告诉我们吗？

查看文档，它们总是留下明确的"origins="；地址"。在你的事业中，它将是：

@CrossOrigin(origins ="http://localhost:3000")

使用

@CrossOrigin(origins = "http://localhost:3000")

我认为本地主机上的cors不起作用。

看看下面的页面。

为什么我http://localhostCORS起源不起作用？

https://medium.com/swlh/avoiding-cors-errors-on-localhost-in-2020-5a656ed8cefa#:~：text=1。，设置%20in%20Create%20React%20App&text=%22proxy%22%3A%20%22https%3A%2F%2F，CORS%20error%20将被%20解析。

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