Check My User Agent
About User Agent
The User-Agent request header contains a characteristic string that allows the network protocol peers to identify the application type, OS, software vendor or software version of the requesting software User Agent. Armed with this information, you can develop richer and more dynamic websites that deliver different experiences based on the user agent that is visiting.
When your browser (or similar device) loads a website, it identifies itself as an agent when it retrieves the content you have requested. Along with that user agent identification, the browser sends a host of information about the device and network that it is on. This is a really set of data for web developers, since it allows them to customize the experience depending on the User-Agent that is loaded the page.
Can I change my user agent?
It is possible to change or "fake" what your web browser sends as its user agent. Some desktop/mobile web browsers will let you change what the browser identifies itself as (ie "Mobile Mode" or "Desktop Mode") in order to access certain websites that only allow desktop computers. If you change this setting, the user agent is what is affected.
About HTTP Status Code tool
This Check User Agent Online show your User Agent.