URLSession: use http/1.1 instead of http/2

Question

I saw that URLSession supports HTTP 1.1 and HTTP 2 (URLSession supports the HTTP/1.1 and HTTP/2 protocols).

How can I enforce URLSession to use HTTP1.1?

score 8 · Accepted Answer · answered Dec 05 '19 at 09:17

8

This is not something determined by the URLSession. It is determined by the server it connects to.

answered Dec 05 '19 at 09:17

Fogmeister

1

but if the server says that http/2 is possible can't 1.1 be enforced by the client? this is possible on Android... – swalkner Dec 05 '19 at 09:39
@swalkner Why would you want to do that? – Fogmeister Dec 05 '19 at 09:41
3

cause currently we're using a tool which has a bug with http/2 and we cannot force 1.1 on the server. – swalkner Dec 05 '19 at 10:28
@swalkner ah, fair enough. – Fogmeister Dec 05 '19 at 11:05
@swalkner did you manage to force the http/1.1 from the client side? – Starsky Feb 26 '20 at 10:53
unfortunately not :( – swalkner Feb 27 '20 at 12:34
2

When the server offers HTTP/2 and then has an error, but works with HTTP/1.1, one really wishes for control over the user-agent! – John Jan 12 '21 at 21:43
Hey guys, did you get any success falling back to use of http1.1? I read it depends on server but want to know if client can have ability to offer http1.1 only? – Krupal Ghorpade Mar 31 '22 at 13:16

score 2 · Answer 2 · answered Dec 30 '20 at 07:33

2

Not exactly, there is ALPN negotiation to decide if HTTP/2. If client does not send ALPN, then server should not use HTTP/2.

answered Dec 30 '20 at 07:33

lu fei

2 Answers2