fetch() does not send headers?

user_311865 0
Viewed 79345

I am sending POST request like this from browser:

fetch(serverEndpoint, {
    method: 'POST',
    mode: 'no-cors', // this is to prevent browser from sending 'OPTIONS' method request first
    redirect: 'follow',
    headers: new Headers({
            'Content-Type': 'text/plain',
            'X-My-Custom-Header': 'value-v',
            'Authorization': 'Bearer ' + token,
    }),
    body: companyName
})

By the time the request reaches my back-end it does not contain X-My-Custom-Header nor Authorization header.

My back-end is Google Cloud function for Firebase (basically just Node.js endpoint) that looks like this:

exports.createCompany = functions.https.onRequest((req, res) => {
    let headers = ['Headers: ']
    for (let header in req.headers) {
        headers.push(`${header} : ${req.headers[header]}`)
    }
    console.log(headers)
    ...
}

The console log of that Google Cloud for Firebase function does not contain any X-My-Custom-Header nor Authorization header.

What is wrong?

Edit 1

So using dev tools in Chrome a checked that neither X-My-Custom-Header nor Authorization header is send from the browser... The questions now are: Why? How do I fix it?

Edit 2

More information about my app: It's React app. I have disabled service worker. I have tried to create Request and specifically add headers using req.headers.append(). The headers still wouldn't send.

fetch-api cors post http javascript
5 Answers

I also had this same issue. I resolved it by removing 'no-cors' from javascript and adding the following in server side spring boot.

public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
        protected void configure(HttpSecurity httpSecurity) throws Exception {
             .antMatchers(HttpMethod.OPTIONS, "/**").permitAll()

        }
    }
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