83 lines
2.4 KiB
Markdown
83 lines
2.4 KiB
Markdown
---
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stage: none
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group: unassigned
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info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
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---
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# Axios
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We use [Axios](https://github.com/axios/axios) to communicate with the server in Vue applications and most new code.
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In order to guarantee all defaults are set you *should not use Axios directly*, you should import Axios from `axios_utils`.
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## CSRF token
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All our requests require a CSRF token.
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To guarantee this token is set, we are importing [Axios](https://github.com/axios/axios), setting the token, and exporting `axios` .
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This exported module should be used instead of directly using Axios to ensure the token is set.
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## Usage
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```javascript
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import axios from './lib/utils/axios_utils';
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axios.get(url)
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.then((response) => {
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// `data` is the response that was provided by the server
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const data = response.data;
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// `headers` the headers that the server responded with
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// All header names are lower cased
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const paginationData = response.headers;
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})
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.catch(() => {
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//handle the error
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});
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```
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## Mock Axios response in tests
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To help us mock the responses we are using [axios-mock-adapter](https://github.com/ctimmerm/axios-mock-adapter).
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Advantages over [`spyOn()`](https://jasmine.github.io/api/edge/global.html#spyOn):
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- no need to create response objects
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- does not allow call through (which we want to avoid)
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- clear API to test error cases
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- provides `replyOnce()` to allow for different responses
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We have also decided against using [Axios interceptors](https://github.com/axios/axios#interceptors) because they are not suitable for mocking.
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### Example
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```javascript
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import axios from '~/lib/utils/axios_utils';
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import MockAdapter from 'axios-mock-adapter';
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let mock;
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beforeEach(() => {
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// This sets the mock adapter on the default instance
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mock = new MockAdapter(axios);
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// Mock any GET request to /users
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// arguments for reply are (status, data, headers)
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mock.onGet('/users').reply(200, {
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users: [
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{ id: 1, name: 'John Smith' }
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]
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});
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});
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afterEach(() => {
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mock.restore();
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});
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```
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### Mock poll requests in tests with Axios
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Because a polling function requires a header object, we need to always include an object as the third argument:
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```javascript
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mock.onGet('/users').reply(200, { foo: 'bar' }, {});
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```
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