Support URI templates in RequestEntity

[parviz-93]

Add String based URI template and vararg to builder #22083

[rstoyanchev]

Overall on the right path.

In addition to line specific comments, this is lacking the change where the RestTemplate uses the new getUrl(UriTemplateHandler) method instead of getUrl() which would add the benefits of a pre-configured base URL among others. That was the following step from the instructions:

6. Make use of this new method in RestTemplate.

Keep in mind also this cannot be merged at the moment until we switch master to 5.3 development.

[rstoyanchev]

Making good progress. I've added more comments.

[rstoyanchev]

Thanks for all the updates! This is now in good shape for inclusion. When master is switched to 5.3 development I'll process this right away.

[parviz-93]

@rstoyanchev thank you for review. if there are issues which your hands do not reach, I am always ready to help

[rstoyanchev]

Thanks! Keep an eye on the "ideal-for-contribution" label.

[jhoeller]

@rstoyanchev I'm afraid we have do revisit this one since it turned out to create a package cycle between org.springframework.http (where RequestEntity lives) and org.springframework.web (where UriTemplateHandler lives). We'll have to put this getUrl overload into some utility method or introduce a dedicated RequestEntity subclass in the org.springframework.web package which may then integrate with specific facilities such as UriTemplateHandler there.

[rstoyanchev]

This should be taken care of now.