ReactJs No Authorization Header is present

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I am trying to get json data returned from my api call using reactjs. 1. I tried running url with valid bearer token on fiddler and it gave me correct results. 2. I tried using same url in below fetch call and used the same fiddler generated bearer token in react code.

It throws 401 unauthorized error.

I compared point 1 and point 2 fiddler requests under tab AUTH. One has correct bearer token but 2nd one i.e react code says "No Authorization Header is present". I am sending Token in react code but why it says "No Authorization Header is present"

componentDidMount () {
  const url = 'my reallyworking api url on fiddler';
    , {
      method: 'POST',
      crossDomain: true,
      mode: 'no-cors',
      headers: new Headers({
        'Authorization': 'Bearer ' + 'token generated from fiddler after running auth',
        'Accept': 'application/json',
        'Content-Type': 'application/json'
    .then(res => res.json())
      (result) => {
          isLoaded: true,
          gridData: result.items
      (error) => {
          isLoaded: true,

Fiddler is not showing any Headers. Below is my fiddler tracking

POST https://myurl HTTP/1.1
Host: myHost
Connection: keep-alive
Content-Length: 0
accept: application/json
Origin: https://localhost:xyz
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.119 Safari/537.36
Referer: https://localhost:xyz/testfetch
Accept-Encoding: gzip, deflate, br
Accept-Language: en-US,en;q=0.9

Note: 1. I created a headers object headers: new Headers({'content-type': 'application/json'}),as explained here 2. I am not using isomorphic fetch as explained here

Try to check the API in Postman. That will show detailed request and response to you.

CORS should return correct headers even if an authorization header , Describe the bug When CORS is enabled and "authorization" header CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. Login page belyaev-andrey/quarkus-petclinic-reactjs#2. I am trying to get json data returned from my api call using reactjs. 1. I tried running url with valid bearer token on fiddler and it gave me correct results. 2. I tried using same url in below f

A Headers object also has an associated guard, which takes a value of immutable. Why did you use POST without body? Edit your fetch function like:

fetch(url, {
   method: 'POST',
   crossDomain: true,
   mode: 'no-cors',
   body: JSON.stringify({// you data here})
   headers: {
     'Authorization': 'Bearer ' + 'token generated from fiddler after running auth',
     'Accept': 'application/json',
     'Content-Type': 'application/json'
  .then(response => response.json())
  .then(responseJson => {
   // do somethign here...

How to send the authorization header using Axios, Learn how to send the authorization header using Axios. To set headers in an Axios POST request, pass a third object to the call. You might and check out my premium React/Vue/Svelte/Node/Next.js courses! Auth header is a helper function that returns an HTTP Authorization header containing the JWT auth token of the currently logged in user. If the user isn't logged in an empty object is returned. The auth header is used to make authenticated HTTP requests to the server api using JWT authentication.

First of all i didnt't find what is the option "crossDomain" mean, official documentation does not contain such option. Secon - i'd try to make such auth request to the local test server and check if all necessary data included, additionally it can be checked in the network tab of the devTools. When you will see what's wrong with request you can make next steps to do at first a simple auth request without additional options.

How to get authentication using Javascript fetch? : Chargebee Help , If an opaque response serves your needs, set the request's mode to 'no-cors' to access control check: No 'Access-Control-Allow-Origin' header is present on� POST request using fetch with set HTTP headers. This sends the same POST request again from React using fetch with a couple of extra headers set, the HTTP Authorization header and a custom header My-Custom-Header.

When you need use CORS, while your domains point same server and allow headers in server and authorization sign is all alright, but you make a request out server domain, you need a proxy CORS, if you and make request like to

axios.get(${''} .then(res => { console.log(res) })

Access-Control-Allow-Credentials, Credentials are cookies, authorization headers or TLS client certificates. a request is made for a resource with credentials, if this header is not� Auth header is a helper function that returns an HTTP Authorization header containing the basic authentication credentials (base64 username and password) of the currently logged in user from local storage. If the user isn't logged in an empty object is returned.

I tried navigating to azure portal, Opened my registered application, settings and under platform features/cors, I removed all urls and added *. This added authorization header for me. Adding * for cors is not recommended, but to test application on my localhost I tried this option. Once application is deployed, I removed * from cors allowed sites list and added my real site url there.

I came to this conclusion by using fiddler and postman side by side.

Authentication in Golang and React using JWTs, Practice Go and React by building and authenticating a RESTful API with You should get back this response: Required authorization token not found . the signed in user's // access token in the Authorization header const� As of now, no logic is done — it will pull whatever data it finds in the AuthContext. To use our new context, we will need to add a provider to react. We'll add this provider in the App.js file.

React Authentication: How to Store JWT in a Cookie, Maybe you're making authentication and authorization happen with JSON see that we're no longer sending the JWT as an Authorization header. a anti-CSRF token be present in the request, but we are not providing one. A bearer token is a value that goes into the Authorization header of any HTTP requests. It is not automatically stored anywhere, it has no expiry date and no associated domain.

How can I authenticate API requests? – Zendesk help, All methods of authentication set the authorization header differently. Credentials sent in the payload (body) or URL are not processed. Reactjs Axios Authorization header problem. Hi, No 'Access-Control-Allow-Origin' header is present on the requested resource.

React JWT Authentication (without Redux) example, Step by step to implement React JWT Auth (without Redux) using React Router, user.service uses auth-header() helper function to add JWT to HTTP This page gets current User from Local Storage by calling AuthService. Look for the 🛠️️ emoji if you'd like to skim through the content while focusing on the build steps. Auth0 launched its React SDK on June 24th, 2020, to provide React developers with an easier way to add user authentication to React applications using a hooks-centric approach.