What could be the reason for receiving a 431 status error after including a JWT token in the Authorization section of the header?

Currently, I am in the process of developing a full stack React application with Express and Node. I have successfully integrated auth0 for authentication and authorization purposes. However, I have encountered an issue and am seeking suggestions on how to resolve it. Any help would be greatly appreciated!

"Failed to load resource: the server responded with a status of 431 (Request Header Fields Too Large)"

Below is the class component where I make a call to my api/tasks route and provide the jwt access token obtained from Auth0.

import React, { Component } from 'react';
import axios from "axios";
import {withAuth0} from "@auth0/auth0-react";
import config from "../auth_config.json";
const {apiOrigin = "http://localhost:3001"} = config

componentDidMount() {
        const getProtectedTasks = async () => {
            const {getAccessTokenSilently} = this.props.auth0;
            const accessToken = await getAccessTokenSilently();
            try {
                const token = accessToken;
                const self = this;
                const response = await axios.get(`${apiOrigin}/api/tasks`, {
                    headers: {
                        Authorization: `Bearer ${token}`
                    }
                })
                self.setState({
                    allTasks: response.data
                })

            } catch {

            }
        }
        getProtectedTasks()

    }

Here is the code that manages the GET request to the api/tasks endpoint:

const db = require("../models");
const jwt = require("express-jwt");
const jwksRsa = require("jwks-rsa");

module.exports = function (router) {
    const authorizeAccessToken = jwt({
        secret: jwksRsa.expressJwtSecret({
            cache:true,
            rateLimit:true,
            jwksRequestsPerMinute:5,
            jwksUri: `https://task-motivator.us.auth0.com/.well-known/jwks.json`
        }),
        audience: "https://quickstarts/api",
        issuer: "https://task-motivator.us.auth0.com",
        algorithms: ["RS256"]
    });

    router.get("/api/tasks", authorizeAccessToken, (req, res) => {
        db.Task.findAll({}).then(data => {
            res.json(data);
        });
    });

Answer №1

The problem I encountered was caused by the length of the JWT token. Without additional information, it can be challenging to pinpoint the exact reason (as others have mentioned in their comments), but one potential solution is to reduce the size of your data-to-jwt-sign.

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