All APIs are written with a minimum supported language version. Any version above this is theoretically supported, but bleeding edge releases may not be supported. To help determine whether a version is supported, the table below shows the versions which are tested as part of each release, in addition to the minimum target version.
If something is not supported here, and you believe it should be, contact us.
| Language / Framework | Minimum Supported Version | Tested Configurations (if it is not routinely tested, that does not mean it's not supported) |
| C/C++ | C11 and above | Windows 10 - VS2017 Mac OS 10.14 - Clang 11 Ubuntu 16.04 - GCC 5.4 |
| .NET | Standard 2.0 and above | Windows Server 2019 - .NET Core 3.1 and .NET Framework 4.6.2 |
| Java | JDK8 and all LTS versions above | Windows Server 2019 - OpenJDK 8 & 11 Mac OS 10.14 - OpenJDK 8 & 11 Ubuntu 16.04 - OpenJDK 8 & 11 |
| Node.js | 6 and all LTS versions above | Ubuntu 18.04 - Node.js LTS versions (6, 8, 10 and 12) |
| Varnish | Varnish 6.0.6 C11 and above | Ubuntu 16.04 - GCC 5.4 - 64-bit Ubuntu 18.04 - GCC 7.4 - 64-bit |
| PHP | PHP 5.6 and 7.x | Ubuntu 18.04 - PHP 5.6, 7.2, 7.3 and 7.4 |
| Python | Python 2.7 or Python 3 | Ubuntu 16.04 - Python 2.7, 3.5 Ubuntu 18.04 - Python 2.7, 3.6 |