Chapter 4
Network Requests
Many browser APIs are asynchronous in nature. This chapter contains recipes for performing basic tasks asynchronously using callback functions, events, and Promises.
Examples
Recipe 4.1
Sending a Request With XMLHttpRequest
Use the XMLHttpRequest API to send a GET request to a web API.
Recipe 4.2
Sending a GET Request With the Fetch API
Use the Fetch API to send a GET request to a web API.
Recipe 4.3
Sending a POST Request With the Fetch API
Use the Fetch API to send a POST request to a web API.
Recipe 4.4
Uploading a File with the Fetch API
Use the Fetch API to upload file data.
Recipe 4.5
Sending a Beacon
Send a quick POST request containing analytics or other data as the user is leaving your page.
Recipe 4.6
Listening for Remote Events with Server-Sent Events (SSE)
Send a quick POST request containing analytics or other data as the user is leaving your page.
Recipe 4.7
Exchanging Data in Real Time with WebSockets
Send a quick POST request containing analytics or other data as the user is leaving your page.
