Invalid User-Agent header being sent to add-ons

Summary

Jira Cloud is sending an invalid User-Agent header in HTTP requests to our add-on. The HTTP requests include the lifecycle events: Installed, Enabled; as well as other user-initiated requests and web hooks.

User-Agent: Atlassian HttpClient unknown / JIRA-1001.0.0-SNAPSHOT (100059) / Default

Steps to Reproduce

1. Make an HTTP request. Can be encountered in lifecycle events.

Expected Results

Valid user-agent value

Actual Results

Illegal header: Illegal 'user-agent' header: Invalid input '/', expected WSP, CRLF, product-or-comment or 'EOI' (line 1, column 64): Atlassian HttpClient unknown / JIRA-1001.0.0-SNAPSHOT (100059) / Atlassian-Connect/1.3.238

Notes

It appears that the application server is choking on the second '/' in the `User-Agent` string.