fix: add reqwest dependency to transport-streamable-http-client feature

- Fix compilation error when using transport-streamable-http-client feature due to missing dependency
- Move From<reqwest::Error> implementation to reqwest module

Author: joulei

crates/rmcp/Cargo.toml

@@ -107,7 +107,7 @@ transport-worker = ["dep:tokio-stream"]
 
 
 # Streamable HTTP client
-transport-streamable-http-client = ["client-side-sse", "transport-worker"]
+transport-streamable-http-client = ["client-side-sse", "transport-worker", "reqwest"]
 
 
 transport-async-rw = ["tokio/io-util", "tokio-util/codec"]

crates/rmcp/src/transport/common/reqwest/streamable_http_client.rs

@@ -14,6 +14,12 @@ use crate::{
     },
 };
 
+impl From<reqwest::Error> for StreamableHttpError<reqwest::Error> {
+    fn from(e: reqwest::Error) -> Self {
+        StreamableHttpError::Client(e)
+    }
+}
+
 impl StreamableHttpClient for reqwest::Client {
     type Error = reqwest::Error;
 

crates/rmcp/src/transport/streamable_http_client.rs

@@ -48,11 +48,6 @@ pub enum StreamableHttpError<E: std::error::Error + Send + Sync + 'static> {
     Auth(#[from] crate::transport::auth::AuthError),
 }
 
-impl From<reqwest::Error> for StreamableHttpError<reqwest::Error> {
-    fn from(e: reqwest::Error) -> Self {
-        StreamableHttpError::Client(e)
-    }
-}
 
 pub enum StreamableHttpPostResponse {
     Accepted,