Is there a way to force an XMLHttpRequest to use HTTP/1.1?

Question

I have a server endpoint that supports both HTTP/1.1 and HTTP2. For testing purposes, I want to try downloading content from the endpoint with both HTTP/1.1 and HTTP2 connections, possibly at the same time.

When I request data from the endpoint with an XMLHttpRequest, it automatically uses HTTP2, without me including the Connection: Upgrade header.

Is there a way to force an XMLHttpRequest to use HTTP/1.1 for the underlying TCP connection? What about other protocols, such as Quic or SPDY?

The browser decides which protocol it wants to use as an implementation detail of the `XmlHttpRequest` object. You can't force a particular choice from inside your script. — Remy Lebeau, Jun 20 '19 at 00:51

score 3 · Accepted Answer · answered Jun 26 '19 at 16:42

3

No.

From Remy Lebeau's comment:

The browser decides which protocol it wants to use as an implementation detail of the XmlHttpRequest object. You can't force a particular choice from inside your script.

answered Jun 26 '19 at 16:42

Lincoln Bergeson

3,301
5
36
53

score 1 · Answer 2 · answered Oct 29 '21 at 12:39

1

You could use IE10. It does not support HTTP/2 and will use HTTP/1.1. If you have IE11 installed, you can force it to behave like IE10 using its F12 developer tools interface.

answered Oct 29 '21 at 12:39

Eric P Smith

163
7

Is there a way to force an XMLHttpRequest to use HTTP/1.1?

2 Answers2

No.

Linked