Here are some links about the issues related to the use of RequestMapping (PostMapping, GetMapping etc) : Stack Exchange Link
The main issue is when a client (e.g. through Apache HTTP client) sends requests to a servlet with the relevant parameters (here be careful where parameter is posted: in the header or the body, see here and here) the servlet will receive/process the parameters according to a pre-agreement...
Spring framework provides useful functionality and annotations (e.g. PostMapping) to automate/shorten all content negotiation related stuff. See here.
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The phrase I like very much : "Small steps into big dreams ..."
