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apollo-angular-link-http

1.10.0 • Public • Published

HTTP Link

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Purpose

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

Installation

npm install apollo-angular-link-http --save

Usage

import {HttpLinkModule, HttpLink} from 'apollo-angular-link-http';
 
@NgModule({
  imports: [HttpLinkModule],
})
class AppModule {
  constructor(httpLink: HttpLink) {
    const link = httpLink.create({uri: '/graphql'});
  }
}

HttpClient

The HTTP Link relies on having HttpClient (from @angular/common/http) present in your application.

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. If you would like to use persisted queries or just not to send a query, disable includeQuery.

name value default required
uri string / function /graphql false
includeExtensions boolean false false
includeQuery boolean true false
headers HttpHeaders none false
withCredentials boolean none false
method string POST false

Context

The HTTP Link uses the headers field on the context to allow passing headers to the HTTP request. It also supports the withCredentials field for defining credentials policy for request. These options will override the same key if passed when creating the the link. If some setting is different than the one in Options, this one will be used.

name value default required
uri string as in options false
includeExtensions boolean as in options false
includeQuery boolean as in options false
headers HttpHeaders none false
withCredentials boolean as in options false
method string as in options false
useMultipart boolean as in options false 
import {HttpLinkModule, HttpLink} from 'apollo-link-http';
import {ApolloModule, Apollo} from 'apollo-angular';
import {InMemoryCache} from 'apollo-cache-inmemory';
import {HttpClientModule} from '@angular/common/http';
 
@NgModules({
  imports: [HttpClientModule, ApolloModule, HttpLinkModule],
})
class AppModule {
  constructor(apollo: Apollo, httpLink: httpLink) {
    apollo.create({
      link: httpLink.create({uri: '/graphql'}),
      cache: new InMemoryCache(),
    });
  }
}
 
// a query with apollo-angular
apollo.query({
  query: MY_QUERY,
  context: {
    // example of setting the headers with context per operation
    headers: new HttpHeaders().set('X-Custom-Header', 'custom-value'),
  },
});

Uri as function

@NgModules({
  imports: [HttpClientModule, ApolloModule, HttpLinkModule],
})
class AppModule {
  constructor(apollo: Apollo, httpLink: httpLink) {
    apollo.create({
      link: httpLink.create({
        uri(operation) {
          return operation.operationName === 'login' ? '/auth' : '/graphq';
        },
      }),
      cache: new InMemoryCache(),
    });
  }
}

File upload

In order to upload a file, you need to turn on useMultipart flag:

apollo.query({
  query: MY_QUERY,
  context: {
    useMultipart: true
  },
});

Middleware

import {ApolloLink} from 'apollo-link';
import {HttpLink} from 'apollo-angular-link-http';
 
class AppModule {
  constructor(httpLink: HttpLink) {
    const http = httpLink.create({uri: '/graphql'});
    const middleware = new ApolloLink((operation, forward) => {
      operation.setContext({
        headers: new HttpHeaders().set(
          'Authorization',
          localStorage.getItem('token') || null,
        ),
      });
      return forward(operation);
    });
 
    const link = middleware.concat(http);
  }
}

Afterware (error)

import {ApolloLink} from 'apollo-link';
import {HttpLink} from 'apollo-angular-link-http';
import {onError} from 'apollo-link-error';
 
import {Auth} from './auth.service';
 
class AppModule {
  constructor(httpLink: HttpLink, auth: Auth) {
    const http = httpLink.create({uri: '/graphql'});
    const error = onError(({networkError}) => {
      if (networkError.status === 401) {
        auth.logout();
      }
    });
 
    const link = error.concat(http);
  }
}

Keywords

Install

npm i apollo-angular-link-http

DownloadsWeekly Downloads

48,513

Version

1.10.0

License

MIT

Unpacked Size

126 kB

Total Files

26

Repository

Gitgithub.com/apollographql/apollo-angular/tree/master/packages/apollo-angular-link-http

Last publish

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