TypeError：无法在'Window'上执行'fetch'：无效的值 [英] TypeError: Failed to execute 'fetch' on 'Window': Invalid value

问题描述

我尝试使用fetch从后端调用使用react，而不使用libs（例如Axios）。所以我创建了这个函数：

I've tried to use fetch to call from backend using react, without libs (such as Axios). So I created this function:

export function api(url, method, body, isHeaderContentType,isRequestHeaderAuthentication,header, succesHandler, errorHandler) {
const prefix = 'link';
console.log("url:",prefix+url);
const contentType = isHeaderContentType ? {
    'Content-Type': 'application/json',
} : {};
const auth = isRequestHeaderAuthentication
    ? {
        Authorization: `Bearer ${AuthUtils.getTokenUser}`,
    }
    : {};
fetch(prefix + url, {
    method,
    headers: {
        ...contentType,
        ...auth,
        ...header,

    },
    protocol:'http:',
    body,
})
    .then(response => {
        response.json().then(json => {
            if (response.ok) {
                console.log("method", json);
                if (succesHandler) {
                    succesHandler(json)
                }
            } else {
                return Promise.reject(json)
            }
        })
    })
    .catch(err => {
        console.log("error",`${url}  ${err}`);
        if (errorHandler) {
            errorHandler(err);
        }
    })

}
并将其称为这样

} and call it like this

api(
            `link`,
            "GET",
            null,
            true,
            true,
            null,
            response => {
                this.setState({profile:response.data})
            },
            err => {
                console.log('error', err);
            }
        );

我在这个函数中调用我的api（）：

i call my api() inside this function:

getProfileUser = () =>{
    if (!isUserAuthenticated()){
        history.push('/signin')
    }else {
        api(
            `link`,
            "GET",
            null,
            true,
            true,
            null,
            response => {
                this.setState({profile:response.data})
            },
            err => {
                console.log('error', err);
            }
        );
    }
};

这是我的完整组件：

export default class Profile extends Component {
constructor(props) {
    super(props);
    this.state = {
        profile:[]
    }

}
getProfileUser = () =>{
    if (!isUserAuthenticated()){
        someCode
    }else {
        api(
            `link`,
            "GET",
            null,
            true,
            true,
            null,
            response => {
                this.setState({profile:response.data})
            },
            err => {
                console.log('error', err);
            }
        );
    }
};

componentDidMount() {
    this.getProfileUser();
}

render(){
    return(
        <div>
            hello 
        </div>
    )
}

}

但当我试图运行它时，我得到一个这样的错误

but when i tried to run it, i got an error like this

TypeError：无法在'Window'上执行'fetch'：无效值

TypeError: Failed to execute 'fetch' on 'Window': Invalid value

有没有人知道我的代码有什么问题？当我使用POST方法时该功能有效，但当我使用GET方法时它不起作用

Is there anyone who knows what's wrong with my code? The function works when I use the "POST" method, but it doesn't work when I use "GET" method

推荐答案

当我尝试在我的fetch调用中添加授权标头时，这也发生在我身上。在我的情况下，它是由标题字符串中的换行符引起的，即 Bearer：\ nsomelong-token 。更改为新线到空间解决了问题。

This also happened to me when I tried to add an Authorization header to my fetch calls. In my case it was caused by a newline character in the header string, i.e. Bearer:\nsomelong-token. Changing to the new line to a space solved the problem.

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