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apollo-link-http

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apollo-link-http

HTTP transport layer for GraphQL

  • 1.5.9
  • Source
  • npm
  • Socket score

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Maintainers
3
Created

What is apollo-link-http?

The apollo-link-http package is used to connect Apollo Client to a GraphQL server over HTTP. It provides a standard way to send GraphQL queries and mutations to a server, handle responses, and manage errors.

What are apollo-link-http's main functionalities?

Basic HTTP Link

This code demonstrates how to create a basic HTTP link to connect to a GraphQL server using the apollo-link-http package. The `createHttpLink` function is used to specify the URI of the GraphQL server, and the link is then used to configure the Apollo Client.

const { createHttpLink } = require('apollo-link-http');
const { ApolloClient, InMemoryCache } = require('@apollo/client');

const httpLink = createHttpLink({
  uri: 'https://example.com/graphql',
});

const client = new ApolloClient({
  link: httpLink,
  cache: new InMemoryCache(),
});

Setting HTTP Headers

This code demonstrates how to set HTTP headers, such as an authorization token, for each request. The `setContext` function from `apollo-link-context` is used to modify the headers before the request is sent.

const { createHttpLink } = require('apollo-link-http');
const { ApolloClient, InMemoryCache } = require('@apollo/client');
const { setContext } = require('apollo-link-context');

const httpLink = createHttpLink({
  uri: 'https://example.com/graphql',
});

const authLink = setContext((_, { headers }) => {
  return {
    headers: {
      ...headers,
      authorization: localStorage.getItem('token') || '',
    }
  };
});

const client = new ApolloClient({
  link: authLink.concat(httpLink),
  cache: new InMemoryCache(),
});

Error Handling

This code demonstrates how to handle errors in GraphQL requests. The `onError` function from `apollo-link-error` is used to log GraphQL and network errors.

const { createHttpLink } = require('apollo-link-http');
const { ApolloClient, InMemoryCache } = require('@apollo/client');
const { onError } = require('apollo-link-error');

const httpLink = createHttpLink({
  uri: 'https://example.com/graphql',
});

const errorLink = onError(({ graphQLErrors, networkError }) => {
  if (graphQLErrors) {
    graphQLErrors.forEach(({ message, locations, path }) => {
      console.log(`GraphQL error: ${message}`);
    });
  }
  if (networkError) {
    console.log(`Network error: ${networkError}`);
  }
});

const client = new ApolloClient({
  link: errorLink.concat(httpLink),
  cache: new InMemoryCache(),
});

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Package last updated on 15 Dec 2018

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