It is this configuration file, but not this line: there is no line in fact, as it's the default configuration that comes with Spring Boot.
It should be Tomcat 9.0.31, and everything else is by default.
So basically, what you demonstrate is not Tomcat vs Undertow vs Webflux performance but Spring default for Tomcat vs Spring default for Undertow vs Spring default for Webflux.
You compare default settings for Spring servlet engines implementation rather than servlet engines themselves, it would be fair to make a note about this.
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It is this configuration file, but not this line: there is no line in fact, as it's the default configuration that comes with Spring Boot.
It should be Tomcat 9.0.31, and everything else is by default.
So basically, what you demonstrate is not Tomcat vs Undertow vs Webflux performance but Spring default for Tomcat vs Spring default for Undertow vs Spring default for Webflux.
You compare default settings for Spring servlet engines implementation rather than servlet engines themselves, it would be fair to make a note about this.