example/client: Cast to UTF-8 only the result page

[kpp]

fahrenheit/examples/client.rs

Line 18 in d85b86d

let res = String::from_utf8_lossy(&buf[..len]);

You can collect the data into Vec<u8>, and after the loop ends you cast the data into String. Because the chunks may contain invalid UTF-8 if you try to cast each chunk to UTF8.