相关疑难解决方法(0)

我正在尝试访问我的 Apollo 客户端的 setContext 函数中的反应上下文值。我希望能够使用反应上下文值动态更新每个 graphql 请求的标头。但是我遇到了一个错误，日志中没有可见的错误消息。我正在尝试做的可能吗？

import React, { useState, useContext } from "react";
import { render } from "react-dom";

import ApolloClient from "apollo-client";
import { ApolloProvider } from "react-apollo";
import { createHttpLink } from "apollo-link-http";
import { setContext } from "apollo-link-context";
import { InMemoryCache } from "apollo-cache-inmemory";

import Select from "./Select";
import CurrencyContext from "./CurrencyContext";
import ExchangeRates from "./ExchangeRates";

const httpLink = createHttpLink({
  uri: "https://48p1r2roz4.sse.codesandbox.io"
});

const authLink = setContext((_, { headers }) => {

  const token = …