This feature allows to processes the plain text content in request and response: fills Accept header with registered charsets, encode request body and decode response body according to ContentType charset.
io.ktor.client.features.HttpPlainText 类中定义，无需任何额外构件。
If no configuration specified in configuration or HTTP call properties, Charsets.UTF_8 is used by default.
val client = HttpClient(HttpClientEngine) {
Charsets {
// Allow to use `UTF_8`.
register(Charsets.UTF_8)
// Allow to use `ISO_8859_1` with quality 0.1.
register(Charsets.ISO_8859_1, quality=0.1f)
// Specify Charset to send request(if no charset in request headers).
sendCharset = ...
// Specify Charset to receive response(if no charset in response headers).
responseCharsetFallback = ...
}
}