Document compatibility of aws-smithy-http-server with lambda_http (…

…#2683)

See #2676.

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examples/pokemon-service-lambda/Cargo.toml

@@ -13,6 +13,9 @@ hyper = {version = "0.14.25", features = ["server"] }
 tokio = "1.26.0"
 tracing = "0.1"
 
+# `aws-smithy-http-server` is only guaranteed to be compatible with this
+# version of `lambda_http`, or semver-compatible versions of this version.
+# Depending on other versions of `lambda_http` may not work.
 lambda_http = "0.7.3"
 
 # Local paths

rust-runtime/aws-smithy-http-server/src/routing/lambda_handler.rs

@@ -16,6 +16,10 @@ type HyperRequest = http::Request<hyper::Body>;
 /// A [`Service`] that takes a `lambda_http::Request` and converts
 /// it to `http::Request<hyper::Body>`.
 ///
+/// **This version is only guaranteed to be compatible with
+/// [`lambda_http`](https://docs.rs/lambda_http) ^0.7.0.** Please ensure that your service crate's
+/// `Cargo.toml` depends on a compatible version.
+///
 /// [`Service`]: tower::Service
 #[derive(Debug, Clone)]
 pub struct LambdaHandler<S> {