By default, proxy from version 0.4.61 will connect to data source APIs using TLS 1.3.
Prior to 0.4.61, the proxy should have negotiated to use 1.3 with all sources that supported it; but may have fallen back to 1.2 for some sources.
It will no longer fall back; but you can configure the proxy to use TLS 1.2 for a given source by setting the TLS_VERSION environment variable on a proxy instance to TLSv1.2. As TLS 1.3 offers security and performance improvements, we recommend using it whenever possible.
As of Sept 2024, we've confirmed that the following public APIs of various data sources support TLS 1.3, either through end-to-end proxy testing OR via openssl negotiation (see next section):
Google Workspace
Microsoft 365 (Microsoft Graph)
GitHub (cloud version)
Asana
Atlassian (JIRA, etc)
Slack
Zoom
To test TLS 1.3 support, you can use something like the following command (assuming you have openssl installed on a Mac):