Constructing ApolloClient for Authorization

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Hi!
I’m trying to set an authorization middleware yo my Apollo Client but something is not working. I can set the corresponding header correctly but my server still responds as i’m not authenticated.
Tried this:

const httpLink = new HttpLink({
      uri: process.env.API_GRAPHQL,
    });

const authLink = setContext((_, { headers }) => {
      // get the authentication token from local storage if it exists
      const token = localStorage.getItem("token");
      // return the headers to the context so httpLink can read them
      return {
        headers: {
          ...headers,
          authorization: token ? `Bearer ${token}` : "",
        },
      };
    });
const apolloClient = new ApolloClient({
      link: authLink.concat(httpLink),
      includeUnusedVariables: true,
      credentials: "include",
      connectToDevTools: true,
      cache: new InMemoryCache({})

And this:

const httpLink = new HttpLink({
      uri: process.env.API_GRAPHQL,
    });

const authMiddleware = new ApolloLink((operation, forward) => {
      var token = localStorage.getItem("token");
      operation.setContext({
        headers: {
          Authorization: token ? `Bearer ${token}` : "",
        },
      });
      console.log(operation);
      return forward(operation);
    });
const apolloClient = new ApolloClient({
      link: authMiddleware.concat(httpLink),
      includeUnusedVariables: true,
      credentials: "include",
      connectToDevTools: true,
      cache: new InMemoryCache({})

I’ve also tried with createHttpLink instead of new httpLink, and with concat(middleware, httpLink) instead of middleware.concat(httpLink).
The sent request has correctly set the token, but the response is still an auth error.
If i do not set any middleware and hard-code my token the Client works fine, something in the construction of my link is not working…
Is there something i’m missing? what are my possibilities? Is there a way I can debug my client?

Thank’s in advance.