TypeError：无法读取未定义的属性（读取'indexOf'）

Question

I keep on getting the TypeError Error when ever I start my application, but only one of the Error's is in my Actual app.js file. The rest are in express's files. My code:

function checkHttps(req, res, next){
  // protocol check, if http, redirect to https
  
  if(req.get('X-Forwarded-Proto').indexOf("https")!=-1){
    return next()
  } else {
    res.redirect('https://' + req.hostname + req.url);
  }
}

But the rest of the files I have no control over.. How do I fix this?

Answer 1

If you want to get the protocol you can go with req.protocol .

If X-Forwarded-Proto is a header, you need to go with

req.headers.get('X-Forwarded-Proto').indexOf("https")!=-1