feat(common,server): add ProtocolMode and route server through protocol dispatch

common/src/error.rs

@@ -1,7 +1,7 @@
 use miette::Diagnostic;
 use thiserror::Error;
 
-/// Result type using the common's custom error type.
+/// Result type using the `common`'s custom error type.
 pub type Result<T> = std::result::Result<T, Error>;
 
 #[derive(Debug, Error, Diagnostic)]

common/src/lib.rs

@@ -1,5 +1,3 @@
-//! Common types and utilities for the TLS benchmark harness
-
 pub mod cert;
 pub mod error;
 pub mod prelude;
@@ -10,7 +8,7 @@ use serde::{Deserialize, Serialize};
 use std::fmt;
 use strum::{Display, EnumString};
 
-/// TLS key exchange mode
+/// TLS 1.3 key exchange mode used for benchmark runs
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, EnumString, Display)]
 #[strum(serialize_all = "lowercase")]
 #[serde(rename_all = "lowercase")]
@@ -21,6 +19,23 @@ pub enum KeyExchangeMode {
     X25519Mlkem768,
 }
 
+/// Application protocol carried over TLS in benchmark runs.
+///
+/// `Raw` is a minimal custom framing protocol (8-byte LE length request, then N payload bytes)
+/// used for low-overhead microbenchmarks.
+///
+/// `Http1` is an HTTP/1.1 request/response mode (`GET /bytes/{n}`) used for realism-oriented
+/// comparisons where HTTP parsing and headers are part of measured overhead.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, EnumString, Display)]
+#[strum(serialize_all = "lowercase")]
+#[serde(rename_all = "lowercase")]
+pub enum ProtocolMode {
+    /// Minimal custom framing protocol for primary microbenchmarks.
+    Raw,
+    /// HTTP/1.1 mode for realism-oriented comparisons.
+    Http1,
+}
+
 /// A single benchmark measurement record, output as NDJSON
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct BenchRecord {

common/src/prelude.rs

@@ -1,4 +1,4 @@
 pub use crate::{
-    BenchRecord, KeyExchangeMode,
+    BenchRecord, KeyExchangeMode, ProtocolMode,
     protocol::{read_payload, read_request, write_payload, write_request},
 };

common/src/protocol.rs

@@ -42,6 +42,7 @@ pub async fn write_request<W: AsyncWriteExt + Unpin>(writer: &mut W, size: u64)
 /// Generate deterministic payload of the given size.
 ///
 /// The pattern is a repeating sequence: 0x00, 0x01, ..., 0xFF, 0x00, ...
+#[inline]
 #[must_use]
 pub fn generate_payload(size: u64) -> Vec<u8> {
     (0..size).map(|i| (i & 0xFF) as u8).collect()