next/dist/esm/server/app-render/parse-and-validate-flight-router-state.js

The React Framework

import { flightRouterStateSchema } from "./types";
export function parseAndValidateFlightRouterState(stateHeader) {
    if (typeof stateHeader === "undefined") {
        return undefined;
    }
    if (Array.isArray(stateHeader)) {
        throw new Error("Multiple router state headers were sent. This is not allowed.");
    }
    // We limit the size of the router state header to ~40kb. This is to prevent
    // a malicious user from sending a very large header and slowing down the
    // resolving of the router state.
    // This is around 2,000 nested or parallel route segment states:
    // '{"children":["",{}]}'.length === 20.
    if (stateHeader.length > 20 * 2000) {
        throw new Error("The router state header was too large.");
    }
    try {
        return flightRouterStateSchema.parse(JSON.parse(decodeURIComponent(stateHeader)));
    } catch  {
        throw new Error("The router state header was sent but could not be parsed.");
    }
}

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