Opera Mini User-Agent string does not contain 'opera mini'

Question

Our NodeJS + Express web app has a lot of users who use Opera mini, as the proxy browser helps them save data, and because a lot of them use feature phones.

My query is this:

When we try to intercept the request from Opera Mini, the user-agent-string is Mozilla/5.0 (Linux; U; Android 5.1.1; en-US; ONE A2003 Build/LMY47V) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 OPR/15.0.2125.101257 Mobile Safari/537.36

Opera's documentation says here that

Opera Mini continues to use Presto on the server, and its UA string is unchanged; it contains the string "Opera Mini".

There is an x-requested-with: "com.opera.mini.native" in the header as well.

My question is, why is the Mozilla user-agent string showing up instead of opera-mini? I tried on Extreme as well as High savings modes. The user-agent is identical.

What am I missing?

Answer 1

If I access our site using Opera Mini's extreme data saving mode, I get a different UA string from the one I get when I access it in normal mode.

Normal mode:

Mozilla/5.0 (Linux; U; Android 4.1.1; Galaxy Nexus Build/JRO03C) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 OPR/22.0.2254.113472

Extreme mode:

Opera/9.80 (Android; Opera Mini/22.0.2254/60.271; U; en) Presto/2.12.423 Version/12.16

The only identifier in the first UA string is "OPR".

Answer 2

Opera Mini disable compress mode on Android by default then you use Wi-Fi and render as native mode (default render engine), practically like WebView.

Opera Mini UA contains Opera Mini only in compress mode.