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HTTP 1.1 426 Upgrade Required

addsum August 20, 2020

Client site suddenly getting the message above and we are able to duplicate the same issue  in our development environment.  Have tried a number of things to try to get past it, but no luck so far.  Hasn't something changed?   Is HTTP 1.1 protocol no longer available?   Snippet from a trace is below.  Connecting to Trello via a desktop program that has been in production and in active use for a long time now.  Using Nov. 2018 openSSL DLL files.   Tried using only TSL 1_2 as suggested by a 2019 post which we were already supporting but still receiving the same response.

Trace file snippet:

HTTP/1.1 426 Upgrade Required<EOL>Date: Thu, 20 Aug 2020 18:07:35 GMT<EOL>Server: globaledge-envoy


addsum August 20, 2020

Forcing the call to use 1.1 seems to resolve for now.  Something must have changed in the last couple of days.

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Vincent MARTIN
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August 21, 2020

I confirm that forcing HTTP 1.1 also solve my problem. Thx for the hint.

Atlassian Team
Atlassian Team members are employees working across the company in a wide variety of roles.
August 24, 2020

HTTP 1.0 has been removed.

> Is HTTP 1.1 protocol no longer available?

HTTP 1.1 will continue to be supported for the foreseeable future.


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