Rossen Stoyanchev opened SPR-8415 and commented

For "x-www-form-urlencoded" data one could use an @RequestBody (via FormHttpMessageConverter) or a @ModelAttribute method argument (via data binding). The latter has a few advantages:

• it results in a typed object rather than MultiValueMap
• with MultiValueMap you lose the ability to apply automatic validation
• use of request.getParameter*() before the @RequestBody argument is resolved causes problems

Affects: 3.1 M1

Issue Links:

• resolveRequestBody algorithm does not take into account ConversionService when determining if binding is possible [SPR-6729] #11395 resolveRequestBody algorithm does not take into account ConversionService when determining if binding is possible
• Support for PUTting form-encoded data [SPR-5628] #10299 Support for PUTting form-encoded data