get character encoding from content-type

[lawremi]

After decoding the message payload, gmailr could extract the charset from the Content-Type header. By default on the web, this is iso-8859-1, which R calls "latin1". That could be set on the string, e.g.,

Encoding(x) <- "latin1"

But then again, I'm not sure where that actually helps, since R always displays and writes strings in the current locale, so things get weird.

[jimhester]

I am definitely not an expert on how character encodings work in R. However setting the encoding based on Content-Type seems to me like something httr should handle if it provides a benefit...

[lawremi]

Not sure what httr could do in this case, since you have to decode the base64 stuff first.