This PR is intended to fix #36149 with the aim to be consistent when the embedded servers start and log their context path as in Jetty started on port 8080 (http/1.1) with context path '/'.
My first approach is to output on every start server line the context path, which by default should be /. However, I've seen that some servers (underlying embedded servers) present some problems when I try to do so.
For example, for undertow, the only way to get the context path is during runtime (i.e., on receiving a request), context path can't be retrieved when building the object. If we want to set the context path, we need to modify more files. (there is a longer explanation regarding the context path in #36149 )
For netty, there is no concept of context path, the only reference to path is to the network address path.
So, for now, I'm only submitting changes for tomcat, as the default context path was nothing, I've changed it to /. This was already the case for jetty.
I am wondering if we should even log the context path and if it has any use at all.
Comment From: wilkinsona
Thanks for the PR, @vicaba. Unfortunately, this isn't really what we had in mind for #36149. As stated in that issue, the goal was to remove "as many of the optional regex groups as possible from the tests added in https://github.com/spring-projects/spring-boot/pull/36103". To do that, we need to make updates across all four web servers for both reactive and imperative apps. I'll push something shortly for #36194. This in any case for taking a look at this one.