6. Notable Differences with HTTP Protocol Messages

This format differs from HTTP message encodings in several key ways:

1. No HTTP version - The binary format does not include an HTTP version identifier

2. Field names lowercase - All field names MUST be lowercase (following HTTP/2 convention)

3. No transfer encoding - Content is directly encoded without Transfer-Encoding header

4. Status code as integer - Response status codes are variable-length integers, not strings

5. No reason phrase - Responses do not include a reason phrase with the status code

6. Pseudo-headers as control data - HTTP/2-style pseudo-headers become control data fields

7. Binary encoding - All lengths and values use QUIC variable-length integer encoding

8. No chunked encoding - Indeterminate-length mode replaces chunked transfer encoding

These differences enable more efficient encoding and processing while preserving HTTP message semantics.