a month ago

How do I handle a 419 error that occurs when using fetch on Console with POST?

I'm attempting to send messages using the console. While it works correctly when I'm logged in, I receive a 419 error when attempting to use an incognito browser where I'm not signed in. I'm not sure why this is happening, and I'm wondering if there's a way to fix it. Can someone explain the reason for this error and offer a solution?

fetch("", {
  "headers": {
    "accept": "application/json, text/plain, */*",
    "accept-language": "en-GB",
    "authorization": "removed 4 safety",
    "cache-control": "no-cache",
    "content-type": "application/json",
    "pragma": "no-cache",
    "sec-ch-ua": "\"Chromium\";v=\"112\", \"Google Chrome\";v=\"112\", \"Not:A-Brand\";v=\"99\"",
    "sec-ch-ua-mobile": "?0",
    "sec-ch-ua-platform": "\"Windows\"",
    "sec-fetch-dest": "empty",
    "sec-fetch-mode": "cors",
    "sec-fetch-site": "same-origin",
    "x-socket-id": "removed 4 safety",
    "x-xsrf-token": "removed 4 safety"
  "referrer": "",
  "referrerPolicy": "strict-origin-when-cross-origin",
  "body": "{\"content\":\"yes\",\"type\":\"message\"}",
  "method": "POST",
  "mode": "cors",
  "credentials": "include"
The "message: "CSRF token mismatch." warning appears in the request preview. However, the same fetch still works on the browser where I'm logged in.

a month ago
Verified Answer
The 419 error is an HTTP status code that indicates that the client has sent too many requests in a given amount of time. It is usually caused by a server-side issue. The error message "CSRF token mismatch" appears when the CSRF token sent with the request does not match the one stored on the server. The reason why you are receiving this error when using an incognito browser where you are not signed in is that the CSRF token is not being stored in your browser's cookies. When you are logged in, your browser stores the CSRF token in its cookies, which allows it to be sent with each request. However, when you are not logged in or using an incognito browser, the CSRF token is not stored in your cookies, which causes the error. To fix this issue, you can try clearing your browser's cache and cookies or try logging in to your account before sending the request again. If this doesn't work, you can try generating a new CSRF token and sending it with your request. I hope this helps! Let me know if you have any other questions.


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a month ago
The reason why you are getting a 419 CSRF token mismatch error when trying to send messages through console on an incognito browser where you are not logged in is that the server is checking the CSRF token in the request header and finds it missing. CSRF stands for Cross-Site Request Forgery and is a security feature that is used to prevent unauthorized requests being made to a server without the user's knowledge or consent. The CSRF token is usually added to the request header by the server when the user logs in. When the user is not logged in, as is the case with an incognito browser, the CSRF token is not present in the headers, hence the error. To fix this, you will need to get a valid CSRF token and add it to your request headers. One way to do this is to log in to the website on the incognito browser and check the headers for a valid CSRF token. You can then copy this token and add it to the headers in your fetch request. Alternatively, you can modify the server-side code to exclude CSRF protection for this particular endpoint, although this is not recommended as it reduces the security of the system.