This commit only writes the 'charset' parameter in the written headers if it is non-default (not UTF-8), since RFC7578 states that the only allowed parameter is 'boundary'. See gh-25885 Closes gh-26290
This commit only writes the 'charset' parameter in the written headers if it is non-default (not UTF-8), since RFC7578 states that the only allowed parameter is 'boundary'. See gh-25885 Closes gh-26290