Rectify header size handling about parsec

[hug-dev]

It was decided that, for now, the size field given in the header should match the size of the header in the 1.0 wire protocol format, as a measure of safety.
If the magic number given is correct, we should however always read the number of bytes given in the header for the rest of the request header and then check if that number is correct. If it is correct, we can then deserialize the header.
It is the following change:

diff --git a/src/requests/request/request_header.rs b/src/requests/request/request_header.rs
index 2829679..c41f527 100644
--- a/src/requests/request/request_header.rs
+++ b/src/requests/request/request_header.rs
@@ -91,11 +91,16 @@ impl RawRequestHeader {
     pub fn read_from_stream<R: Read>(mut stream: &mut R) -> Result<RawRequestHeader> {
         let magic_number = get_from_stream!(stream, u32);
         let hdr_size = get_from_stream!(stream, u16);
-        if magic_number != MAGIC_NUMBER || hdr_size != REQUEST_HDR_SIZE {
+        if magic_number != MAGIC_NUMBER {
+            error!("The magic number ({}) in the request is incorrect.", magic_number);
             return Err(ResponseStatus::InvalidHeader);
         }
         let mut bytes = vec![0_u8; usize::try_from(hdr_size)?];
         stream.read_exact(&mut bytes)?;
+        if hdr_size != REQUEST_HDR_SIZE {
+            error!("The header size ({}) in the request is incorrect.", hdr_size);
+            return Err(ResponseStatus::InvalidHeader);
+        }

         let raw_request: RawRequestHeader = bincode::deserialize(&bytes)?;
         if raw_request.version_maj != 1 || raw_request.version_min != 0 {

[hug-dev]

And similar changes for the responses!

[hug-dev]

Fixed as per linked PR.