resttemplate customized charset

[fightzhong]

code in org.springframework.http.converter.FormHttpMessageConverter#writeMultipart

I use resttemplate to upload images, in alicloud oss server, If the encoding format is actively specified, an error will be returned

Can a configuration be added to allow the user to choose whether to actively increase the character set? Automatically add character set by default, but we can remove the character by cconfiguration?

I know that this active addition of character sets is a standard practice, but it will be less flexible in the case of hard writing

[rstoyanchev]

As of #25885, we no longer add a charset parameter if the charset is UTF-8 or US-ASCII, which is used by default we use UTF-8, which means there should be no charset parameter unless you set it explicitly.