Vaadin flow 14 hangs after Browser engine version parsing failed

[alessandropepi2014]

It happens occasionally that the server is not responding to any request ad hangs after this message appearing on the logs:

961017320 ERROR Browser engine version parsing failed for: mozilla%2f5.0+%28linux%3b+u%3b+android+10%3b+it-it%3b+mi+8+lite+build%2fqkq1.190910.002%29+applewebkit%2f537.36+%28khtml%2c+like+gecko%29+version%2f4.0+chrome%2f89.0.4389.116+mobile+safari%2f537.36+xiaomi%2fmiuibrowser%2f13.6.0-gn For input string: "a%2f5.0" 961017320 ERROR Browser engine version parsing failed for: mozilla%2f5.0+%28linux%3b+u%3b+android+10%3b+it-it%3b+mi+8+lite+build%2fqkq1.190910.002%29+applewebkit%2f537.36+%28khtml%2c+like+gecko%29+version%2f4.0+chrome%2f89.0.4389.116+mobile+safari%2f537.36+xiaomi%2fmiuibrowser%2f13.6.0-gn For input string: "a%2f5.0" 961017320 ERROR OS major version parsing failed for: %2f5 For input string: "%2f5" 961017320 ERROR OS major version parsing failed for: %2f5 For input string: "%2f5" 961017320 ERROR OS minor version parsing failed for: 0+%28linux%3b+u%3b+android+10%3b+it For input string: "0+%28linux%3b+u%3b+android+10%3b+it"

After that I need to restart the servlet. Sometimes this message is not causing any problem, but when the server hangs the last log message is always this one.

Versions:

- Vaadin / Flow version: 14.8.11
- Java version: 11
- OS version: Linux Ubuntu 20.04
- Application Server (if applicable): Jetty 9.4.43.v20210629
- Heap memory: FREE MEM: 3274 Mb, Total MEM:5120Mb, USED MEM: 1846 Mb
- Processors load very low

[alessandropepi2014]

Another error here: ERROR Browser version parsing failed for: mozilla/5.0 (macintosh; intel mac os x 10_13_5) applewebkit/605.1.15 (khtml, like gecko) crios/103 version/11.1.1 safari/605.1.15 begin 7, end 6, length 6

[mcollovati]

ERROR Browser version parsing failed for: mozilla/5.0 (macintosh; intel mac os x 10_13_5) applewebkit/605.1.15 (khtml, like gecko) crios/103 version/11.1.1 safari/605.1.15 begin 7, end 6, length 6

Seems like something has changed in Chrome MAC user agent: in our tests we expect something like CriOS/49.0.2623.73 but in the reported UA it is crios/103 with only major version

For the errors in the description it seems like the UA string is URL encoded

[knoobie]

@mcollovati looking at the provided docu by the Chromium Team it looks like only the major version is provided: https://chromium.googlesource.com/chromium/src.git/+/HEAD/docs/ios/user_agent.md

[caalador]

The original issue seems like using a MI Browser as there is XiaoMi/MiuiBrowser/13.6.0-gn but why is the userAgent received as encoded I can not see as it is taken directly from the request. The encoding is the problem here.

[alessandropepi2014]

Other errors: ERROR Browser major version parsing failed for: 113 vers For input string: "113 vers" 692910514 ERROR Browser engine version parsing failed for: mozilla%2f5.0+%28linux%3b+u%3b+android+11%3b+it-it%3b+redmi+9t+build%2frkq1.201004.002%29+applewebkit%2f537.36+%28khtml%2c+like+gecko%29+version%2f4.0+chrome%2f100.0.4896.127+mobile+safari%2f537.36+xiaomi%2fmiuibrowser%2f13.27.0-gn For input string: "a%2f5.0" 692910514 ERROR OS major version parsing failed for: %2f5 For input string: "%2f5" 692910514 ERROR OS minor version parsing failed for: 0+%28linux%3b+u%3b+android+11%3b+it For input string: "0+%28linux%3b+u%3b+android+11%3b+it" 692911226 ERROR Browser engine version parsing failed for: mozilla%2f5.0+%28linux%3b+u%3b+android+11%3b+it-it%3b+redmi+9t+build%2frkq1.201004.002%29+applewebkit%2f537.36+%28khtml%2c+like+gecko%29+version%2f4.0+chrome%2f100.0.4896.127+mobile+safari%2f537.36+xiaomi%2fmiuibrowser%2f13.27.0-gn For input string: "a%2f5.0" 692911226 ERROR OS major version parsing failed for: %2f5 For input string: "%2f5" 692911226 ERROR OS minor version parsing failed for: 0+%28linux%3b+u%3b+android+11%3b+it For input string: "0+%28linux%3b+u%3b+android+11%3b+it"

[mcollovati]

It is really weird that the header values are encoded. Is the servlet container directly exposed to the client, or is there something in the middle that may modify the HTTP request?

[alessandropepi2014]

There is an httpproxy but the headers are not encoded at the app level. But why is this error causing the entire app to stop responding? Other errors: 896346120 ERROR OS major version parsing failed for: 11) applewebkit/537 For input string: "11) applewebkit/537" 896346120 ERROR OS minor version parsing failed for: 36 (khtml, like gecko) version/4 For input string: "36 (khtml, like gecko) version/4" 896346844 ERROR OS major version parsing failed for: api 30) For input string: "api 30)" 897102922 ERROR OS major version parsing failed for: 11) applewebkit/537 For input string: "11) applewebkit/537" 897102922 ERROR OS minor version parsing failed for: 36 (khtml, like gecko) version/4 For input string: "36 (khtml, like gecko) version/4" 897384546 ERROR OS major version parsing failed for: 11) applewebkit/537 For input string: "11) applewebkit/537" 897384546 ERROR OS major version parsing failed for: 11) applewebkit/537 For input string: "11) applewebkit/537" 897384546 ERROR OS minor version parsing failed for: 36 (khtml, like gecko) version/4 For input string: "36 (khtml, like gecko) version/4"

[caalador]

I can't see anything that would have the application fail just because the browser version fails. The major and minor versions should just be -1 and -1 and the issue logged for a faulty string. What I would expect would be the browser not supported page showing up.