How can we send a HTTP request synchronously?

Question

If I am correct, "A" in "AJAX" means sending a HTTP request asynchronously without waiting for a HTTP response.

I learn that we can send an asynchronous HTTP request by XMLHttpRequest, for example:

function handleButtonPress(e) { var httpRequest = new XMLHttpRequest(); httpRequest.onreadystatechange = handleResponse; httpRequest.open("GET", e.target.innerHTML + ".html"); httpRequest.send(); }

What use case do you have for synchronous requests? In general they are not recommended (certain browsers even state this in their console when a synchronous request is sent) — NielsNet
– NielsNet, Commented May 3, 2019 at 10:42
Just put false as the 3rd parameter to open, but a big warning, if you use this feature not inside a WebWorker it might stop working in the future. — Keith
– Keith, Commented May 3, 2019 at 10:42
I suppose the question is more about alternatives to XMLHttpRequest, no? — raina77ow
– raina77ow, Commented May 3, 2019 at 10:43
Possible duplicate of JavaScript console.log causes error: "Synchronous XMLHttpRequest on the main thread is deprecated..." — Jorge Fuentes González
– Jorge Fuentes González, Commented May 3, 2019 at 10:46
@Keith Thanks. where do you recommend to look up the API usages? — Tim
– Tim, Commented May 3, 2019 at 11:18

Samir · Accepted Answer · 2019-05-03 10:43:56Z

The third param in open function is for async request sending. You can set it to false for a synchronous request

function handleButtonPress(e) { var httpRequest = new XMLHttpRequest(); httpRequest.onreadystatechange = handleResponse; httpRequest.open("GET", e.target.innerHTML + ".html", false); httpRequest.send(); }

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