axios adds request header

In front-end development, we often need to use ajax to send HTTP requests. Axios is a popular Promise-based HTTP client library that easily integrates with browsers and HTTP APIs in Node.js. When sending requests using axios, sometimes we need to add some custom request headers to the request. This article will introduce you to how to add request headers in axios and provide some code examples to help you understand better.

What is a request header?
When sending an HTTP request, the request header (Request Header) is a mechanism for appending additional information to the request. It is an object containing various key-value pairs that provide more details about the request, such as the request method, URL, content type, authentication and other information. The format of the request header is usually in the form of key-value pairs. Each key-value pair is separated by a colon, and the key-value pairs are separated by a newline character.

Adding request headers using axios
When sending a request using axios, we can add request headers by configuring the headers attribute of the object. The headers attribute is an object containing request header information, where we can add the required request headers.

Here is an example of using axios to send a GET request and add a custom User-Agent request header to the request header:

import axios from ‘axios’;

axios.get('/api/data', { headers: { 'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/ 537.3' } }) .then(response => { console.log(response.data); }) .catch(error => { console.error(error); }); 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. In the above example, we added a User-Agent request header to the request header, which is used to identify the client that initiated the request. You can add other custom request headers as needed, such as Authorization, Content-Type, etc.

Adding a public request header
In actual development, we may need to add the same request header to multiple requests. In order to avoid duplicating code, axios allows us to configure a global axios instance, add a request header once, and then include the request header in all requests.

Here is an example of adding public request headers via a global axios instance:

import axios from ‘axios’;

const instance = axios.create({
baseURL: ’
headers: {
‘User-Agent’: ‘Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3’
}
});

instance.get('/api/data')
.then(response => { console.log(response.data); }) .catch(error => { console.error(error); }); 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. In the above example, we created a global axios instance through the axios.create method and configured a The base URL and a User-Agent request header. We can then send requests through this instance and all requests will contain this request header.

Conclusion
Through this article, we learned how to add request headers in axios. We can add request headers in the configuration object of each request, or add public request headers through the global axios instance. According to actual needs, we can add customized request headers to meet different development needs.

I hope this article will help you understand the request header addition of axios. If you want to learn more about the usage of axios, please check the official documentation of axios.

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axios add request header
https://blog.51cto.com/u_16175449/6932255

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