客户端(React / axios.post)无法使用状态代码404发布到服务器端api(Golang / gin)。 我想使此帖子请求成功。
成功卷曲后将数据写入mysql表
curl -X POST -H "Content-Type: application/json" -d '{"title":"bbb", "content":"bbb"}' localhost:4000/api/post
但是,如果是axios.post,则会发生404错误。
这是目标源代码。
interface ArticleState {
title: string;
content: string;
redirect: boolean;
}
class Post extends React.Component<{}, ArticleState> {
constructor(props: {}) {
super(props);
this.state = {
title: '',
content: '',
redirect: false,
};
this.handleChangeTitle = this.handleChangeTitle.bind(this);
this.handleChangeContent = this.handleChangeContent.bind(this);
this.setRedirect = this.setRedirect.bind(this);
this.renderRedirect = this.renderRedirect.bind(this);
}
handleChangeTitle(e: React.FormEvent<HTMLInputElement>) {
this.setState({title: e.currentTarget.value});
}
handleChangeContent(e: React.FormEvent<HTMLInputElement>) {
this.setState({content: e.currentTarget.value});
}
setRedirect() {
this.setState({
redirect: true,
});
const data = {title: this.state.title, content: this.state.content};
axios.post('http://localhost:4000/api/post', data).then(res => {
console.log(res);
});
}
renderRedirect = () => {
if (this.state.redirect) {
return <Redirect to="/post/finish" />;
}
};
render() {
return (
<Container text style={{marginTop: '3em'}}>
<Form onSubmit={this.setRedirect}>
<Form.Input
label="Title"
name="title"
value={this.state.title}
onChange={this.handleChangeTitle}
/>
<Form.Field
label="Content"
name="content"
value={this.state.content}
control="textarea"
onChange={this.handleChangeContent}
/>
{this.renderRedirect()}
<Form.Button content="Submit" />
</Form>
</Container>
);
}
}
type Article struct {
ID int `json:"id"`
TITLE string `json:"title"`
CONTENT string `json:"content"`
}
var articles []Article
func main() {
db, err := sql.Open("mysql", "user:password@tcp(localhost:3306)/article")
if err != nil {
panic(err.Error())
}
defer db.Close()
router := gin.Default()
api := router.Group("/api")
{
api.POST("/post", func(c *gin.Context) {
var article Article
c.BindJSON(&article)
c.Header("Content-Type", "application/json")
c.Header("Access-Control-Allow-Origin", "*")
ins, err := db.Prepare("INSERT INTO articles(title,content) VALUES(?,?)")
if err != nil {
log.Fatal(err)
}
ins.Exec(article.TITLE, article.CONTENT)
c.JSON(http.StatusOK, gin.H{"status": "ok"})
})
}
router.Run(":4000")
}
我希望axios.post成功请求,但实际上以404状态失败。
OPTIONS http://localhost:4000/api/post 404 (Not Found)
Access to XMLHttpRequest at 'http://localhost:4000/api/post'
from origin 'http://localhost:3000' has been blocked by CORS policy:
Response to preflight request doesn't pass access control check:
No 'Access-Control-Allow-Origin' header is present on the requested
resource.
createError.js:17 Uncaught (in promise) Error: Network Error
at createError (createError.js:17)
at XMLHttpRequest.handleError (xhr.js:80)
答案 0 :(得分:0)
该错误表明该请求“已被CORS策略阻止”,这是“ Cross-Origin Resource Sharing”的缩写,是浏览器实施的一种安全措施。解决方案是修改服务器以返回正确的“ Access-Control-Allow-Origin”标头。
答案 1 :(得分:0)
在服务器端添加一些代码后,问题已解决。
api.POST("/post", func(c *gin.Context) {
c.Header("Content-Type", "application/json")
c.Header("Access-Control-Allow-Origin", "*")
// add
c.Header("Access-Control-Allow-Headers", "Content-Type")
var article Article
c.BindJSON(&article)
ins, err := db.Prepare("INSERT INTO articles(title,content) VALUES(?,?)")
if err != nil {
log.Fatal(err)
}
ins.Exec(article.TITLE, article.CONTENT)
c.JSON(http.StatusOK, gin.H{"status": "ok"})
})
// add response to OPTIONS
api.OPTIONS("/post", func(c *gin.Context) {
c.Header("Content-Type", "application/json")
c.Header("Access-Control-Allow-Origin", "*")
c.Header("Access-Control-Allow-Headers", "Content-Type")
c.JSON(http.StatusOK, gin.H{"status": "ok"})
})
答案 2 :(得分:0)
这是我测试过的工作代码:
for