ADD AwsJson build error support

Author: Fahad Zubair

rust-runtime/aws-smithy-legacy-http-server/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "aws-smithy-legacy-http-server"
-version = "0.65.8"
+version = "0.65.9"
 authors = ["Smithy Rust Server <[email protected]>"]
 edition = "2021"
 license = "Apache-2.0"

rust-runtime/aws-smithy-legacy-http-server/src/protocol/aws_json/rejection.rs

@@ -9,6 +9,8 @@ use thiserror::Error;
 
 #[derive(Debug, Error)]
 pub enum ResponseRejection {
+    #[error("error building HTTP response: {0}")]
+    Build(#[from] aws_smithy_types::error::operation::BuildError),
     #[error("error serializing JSON-encoded body: {0}")]
     Serialization(#[from] aws_smithy_types::error::operation::SerializationError),
     #[error("error building HTTP response: {0}")]