Reporting issues


All software has bugs and things that it should do better.

Yauaa is no exception; there are bugs, inaccuracies and there is lots of room for improvement.

So if you find something please report it via the issue tracker.


These are not bugs

I get quite a few bug reports and questions that Yauaa is not extracting the right version number from the provided User-Agent.

Take for example this User-Agent:

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/ Safari/537.36

Most people expect to get

OperatingSystemNameVersion           : 'Windows 10.0'
AgentNameVersion                     : 'Chrome'

but instead they get

OperatingSystemNameVersion           : 'Windows NT ??'
AgentNameVersion                     : 'Chrome 100'

and then report that as a bug.

This is not a bug.

This example was recorded on a Windows 7 system and there is nothing in the User-Agent to extract this anymore.

There are so many manipulations and lies in the User-Agents that simply looking at the User-Agent will yield the wrong answer. Yauaa will try to give the best possible answer and some classes of lies are reported as such.

So in addition to simply looking at the User-Agent it will also overrule these values if a documented manipulations is detected.

Your best workaround

At this point in time (mid 2022) the best way around much of these manipulations and lies is by asking for and recording the User-Agent Client Hints on your website.

If you ask for these User-Agent Client Hints you can get something like these extra request headers in addition to the User-Agent from the browser.

Sec-Ch-Ua" Not A;Brand";v=“99”, “Chromium”;v=“100”, “Google Chrome”;v=“100”
Sec-Ch-Ua-Full-Version-List" Not A;Brand";v=“”, “Chromium”;v=“100.0.4896.75”, “Google Chrome”;v=“100.0.4896.75”

With all of this extra information Yauaa can now correctly report

OperatingSystemNameVersion           : 'Windows 7'
AgentNameVersion                     : 'Chrome 100.0.4896.75'