The "Api::downloadAttachment" method doesn't work with "PHPClient"

[aik099]

When using PHPClient I'm always getting 426 Upgrade Required error, when attempting to download a file from Atlassian Cloud Jira (e.g. using https://your-domain.atlassian.net/rest/api/2/attachment/content/12345 URL).

Not having this issue with CurlClient. According to https://community.atlassian.com/t5/Jira-questions/426-Error-Upgrade-Required/qaq-p/1166653 this is related to SSL.

Returned headers:

Array
(
    [0] => HTTP/1.1 426 Upgrade Required
    [1] => Access-Control-Allow-Origin: *
    [2] => Content-Length: 18943
    [3] => Content-Type: text/html
    [4] => Vary: Accept-Encoding
    [5] => Server-Timing: atl-edge;dur=0,atl-edge-internal;dur=0,atl-edge-upstream;dur=0,atl-edge-pop;desc="aws-nil"
    [6] => Date: Tue, 07 Jan 2025 19:45:20 GMT
    [7] => Server: AtlassianEdge
    [8] => Connection: close
)

The issue is solved by specifying http_version in the stream context as 1.1. Prior to PHP 8.0, it was 1.0 and Atlassian Cloud servers don't like that.

Prior to #147 HTTP 1.0 was enforced in the CurlClient. Now we need to enforce HTTP 1.1 to have consistent logic across clients.

[aik099]

Closed via #239.