Nodejs - Express middleware modification header: typeerror [err_invalid_char]: invalid character in header content

background

Use Express The data proxy method of middleware , Unified use of user information Redis cache

• user-redis

const user_redis = async function (req, res, next) {
    
    const token = req.headers['authorization']
    const user = await redis.client.getAsync(token).then((data) => {
    
        return data
    })
    //  to  header  Add user information , The result is abnormal 
    req.headers.user_info = user
    next()
}

Abnormal information

TypeError [ERR_INVALID_CHAR]: Invalid character in header content ["user_info"]
    at ClientRequest.setHeader (_http_outgoing.js:473:3)
    at new ClientRequest (_http_client.js:193:14)
    ......

resolvent

Reference resources ：

https://github.com/expressjs/express/issues/3401

take user Information goes on base64 After the coding , Decode at the application layer ;

• user_redis

const user_redis = async function (req, res, next) {
    
    const token = req.headers['authorization']
    const user = await redis.client.getAsync(token).then((data) => {
    
        return data
    })
    //  to  header  Add user information , The result is abnormal 
    req.headers.user_info = Buffer.from(user).toString('base64')
    next()
}

• application

const user_str = req.headers.user_info
const userInfo = Buffer.from(user_str,'base64').toString()