Regularly dealing with the creations of HTTPS-web servers, comes along with the testing phases of the HTTPS-sessions’ pages and their components’ related security information and features (Protocol version, cipher suite, HTTPS Strict Transport security, certificate an so on).
Such a web tool for testing and troubleshooting purposes has been available for a while in Mozilla Firefox and browsers based on it, which is no surprise, and Firefox remained the only one to make it available. So that is the one that could be used, until now too.
After a long break of using Opera for the reason (at least part of it) some of the Developer tools were not as accurate as expected, I just came back to it because of pertinent improvements and surprisingly found that the tool is still missing from the Opera’s Developer tools (Ctrl+Shift+I). It seemed logical to assume that the tool would be naturally implemented in time into Opera because of the obvious need for it; without it indeed the work cannot be done.
For the moment under Network in menu, only the following tools are indeed present: Headers, Preview, Response, and Timing. If it takes many efforts from your current team’s developers to achieve this tool, at least it is worth to be done.