JSPM

title: Http Link

Purpose

An Apollo Link to allow sending a single http request per operation.

Installation

npm install apollo-link-http --save

Usage

import { HttpLink } from "apollo-link-http";

const link = new HttpLink({ uri: "/graphql" });

// or
import { createHttpLink } from "apollo-link-http";

const link = createHttpLink({ uri: "/graphql" });

Global Fetch

The HTTP Link relies on having fetch present in your runtime environment. If you are running on react-native, or modern browsers, this should be no problem. If you are targeting an environment without fetch such as older browsers of the server, you will need to pass your own fetch to the link through the options. We recommend unfetch for older browsers and node-fetch for running in node.

Options

HTTP Link takes an object with some options on it to customize the behavior of the link. If your server supports it, the HTTP link can also send over metadata about the request in the extensions field. To enable this, pass includeExtensions as true. The options you can pass are outlined below:

• uri: the URI key can be either a string endpoint or default to "/graphql"
• includeExtensions: allow passing the extensions field to your graphql server, defaults to false
• fetch: a fetch compatiable API for making a request
• headers: an object representing values to be sent as headers on the request
• credentials: a string representing the credentials policy you want for the fetch call
• fetchOptions: any overrides of the fetch options argument to pass to the fetch call

Context

The Http Link uses the headers field on the context to allow passing headers to the HTTP request. It also supports the credentials field for defining credentials policy, uri for changing the endpoint dynamically, and fetchOptions to allow generic fetch overrides (i.e. method: "GET"). These options will override the same key if passed when creating the the link.

This link also attaches the response from the fetch operation on the context as response so you can access it from within another link.

• headers: an object representing values to be sent as headers on the request
• credentials: a string representing the credentials policy you want for the fetch call
• uri: a string of the endpoint you want to fetch from
• fetchOptions: any overrides of the fetch options argument to pass to the fetch call
• response: this is the raw response from the fetch request after it is made.
• http: this is an object to control fine grained aspects of the http link itself (see below)

http options The http link supports an advanced GraphQL feature (and maybe more in the future) called persisted queries. This allows you to not send the stringified query over the wire, but instead send some kind of identifier of the query. To support this you need to attach the id somewhere to the extensions field and pass the following options to the context:

operation.setContext({
  http: {
    includeExtensions: true,
    includeQuery: false,
  }
})

the http object on context currently supports two keys:

• includeExtensions: allowing you to send the extensions object per request
• includeQuery: allowing you to not send a query as part of the request

import HttpLink from "apollo-link-http";
import ApolloClient from "apollo-client";
import { InMemoryCache } from "apollo-cache-inmemory";

const client = new ApolloClient({
  link: new HttpLink({ uri: "/graphql" }),
  cache: new InMemoryCache()
});

// a query with apollo-client
client.query({
  query: MY_QUERY,
  context: {
    // example of setting the headers with context per operation
    headers: {
      authorization: Meteor.userId()
    }
  }
})

Upgrading from apollo-fetch / apollo-client

If you previously used either apollo-fetch or apollo-client, you will need to change the way use and useAfter are implemented in your app. Both can be implemented by writing a custom link. It's important to note that regardless of whether you're adding middleware or afterware, your Http link will always be last in the chain since it's a terminating link.

Middleware

Before

// before
import ApolloClient, { createNetworkInterface } from 'apollo-client';

const networkInterface = createNetworkInterface({ uri: '/graphql' });

networkInterface.use([{
  applyMiddleware(req, next) {
    if (!req.options.headers) {
      req.options.headers = {};  // Create the header object if needed.
    }
    req.options.headers['authorization'] = localStorage.getItem('token') ? localStorage.getItem('token') : null;
    next();
  }
}]);

After

import { ApolloLink } from 'apollo-link';
import { createHttpLink } from 'apollo-link-http';

const httpLink = createHttpLink({ uri: '/graphql' });
const middlewareLink = new ApolloLink((operation, forward) => {
  operation.setContext({
    headers: {
      authorization: localStorage.getItem('token') || null
    }
  });
  return forward(operation)
})

// use with apollo-client
const link = middlewareLink.concat(httpLink);

Afterware (error)

Before

import ApolloClient, { createNetworkInterface } from 'apollo-client';
import { logout } from './logout';

const networkInterface = createNetworkInterface({ uri: '/graphql' });

networkInterface.useAfter([{
  applyAfterware({ response }, next) {
    if (response.statusCode === 401) {
      logout();
    }
    next();
  }
}]);

After

import { ApolloLink } from 'apollo-link';
import { createHttpLink } from 'apollo-link-http';
import { onError } from 'apollo-link-error';

import { logout } from './logout';

const httpLink = createHttpLink({ uri: '/graphql' });
const errorLink = onError(({ networkError }) => {
  if (networkError.status === 401) {
    logout();
  }
})

// use with apollo-client
const link = errorLink.concat(httpLink);

Afterware (data manipulation)

Before

import ApolloClient, { createNetworkInterface } from 'apollo-client';
import { logout } from './logout';

const networkInterface = createNetworkInterface({ uri: '/graphql' });

networkInterface.useAfter([{
  applyAfterware({ response }, next) {
    if (response.data.user.lastLoginDate) {
      response.data.user.lastLoginDate = new Date(response.data.user.lastLoginDate)
    }
    next();
  }
}]);

After

import { ApolloLink } from 'apollo-link';
import { createHttpLink } from 'apollo-link-http';

const httpLink = createHttpLink({ uri: '/graphql' });
const addDatesLink = new ApolloLink((operation, forward) => {
  return forward(operation).map((response) => {
    if (response.data.user.lastLoginDate) {
      response.data.user.lastLoginDate = new Date(response.data.user.lastLoginDate)
    }
    return response;
  })
})

// use with apollo-client
const link = addDatesLink.concat(httpLink);