Update to current rust: use read_exact rather than read_bytes.

src/http/server/request.rs

@@ -372,7 +372,7 @@ impl Request {
         // Read body if its length is specified
         match request.headers.content_length {
             Some(length) => {
-                match buffer.read_bytes(length) {
+                match buffer.read_exact(length) {
                     Ok(body) => match str::from_utf8(body) {
                         Some(body_str) => request.body = body_str.to_owned(),
                         None => return (request, Err(status::BadRequest))