diff --git a/modules/openapi-generator/src/main/resources/rust-server/Cargo.mustache b/modules/openapi-generator/src/main/resources/rust-server/Cargo.mustache
index 5cee315fe481..6c7205f53de5 100644
--- a/modules/openapi-generator/src/main/resources/rust-server/Cargo.mustache
+++ b/modules/openapi-generator/src/main/resources/rust-server/Cargo.mustache
@@ -44,7 +44,7 @@ client = [
     "serde_urlencoded",
 {{/usesUrlEncodedForm}}
 {{#hasCallbacks}}
-    "serde_ignored", "percent-encoding", {{^apiUsesByteArray}}"lazy_static", "regex"{{/apiUsesByteArray}}
+    "serde_ignored", "percent-encoding", {{^apiUsesByteArray}}"lazy_static", "regex",{{/apiUsesByteArray}}
 {{/hasCallbacks}}
 {{! Anything added to the list below, should probably be added to the callbacks list below }}
     "hyper", "hyper-util/http1", "hyper-util/http2", "hyper-openssl", "hyper-tls", "native-tls", "openssl", "url"
diff --git a/modules/openapi-generator/src/main/resources/rust-server/client-request-body-multipart-form.mustache b/modules/openapi-generator/src/main/resources/rust-server/client-request-body-multipart-form.mustache
index 9036f9b8b4c1..c630a21eb43e 100644
--- a/modules/openapi-generator/src/main/resources/rust-server/client-request-body-multipart-form.mustache
+++ b/modules/openapi-generator/src/main/resources/rust-server/client-request-body-multipart-form.mustache
@@ -1,4 +1,4 @@
-        let (body_string, multipart_header) = {
+        let (body_bytes, multipart_header) = {
             let mut multipart = Multipart::new();
 
     {{#exts}}
@@ -43,9 +43,9 @@
                 Err(err) => return Err(ApiError(format!("Unable to build request: {err}"))),
             };
 
-            let mut body_string = String::new();
+            let mut body_bytes = Vec::new();
 
-            match fields.read_to_string(&mut body_string) {
+            match fields.read_to_end(&mut body_bytes) {
                 Ok(_) => (),
                 Err(err) => return Err(ApiError(format!("Unable to build body: {err}"))),
             }
@@ -54,10 +54,10 @@
 
             let multipart_header = format!("multipart/form-data;boundary={boundary}");
 
-            (body_string, multipart_header)
-        };
+            (body_bytes, multipart_header)
+          };
 
-        *request.body_mut() = body_from_string(body_string);
+        *request.body_mut() = BoxBody::new(Full::new(Bytes::from(body_bytes)));
 
         request.headers_mut().insert(CONTENT_TYPE, match HeaderValue::from_str(&multipart_header) {
             Ok(h) => h,
diff --git a/modules/openapi-generator/src/main/resources/rust-server/server-response-body-instance.mustache b/modules/openapi-generator/src/main/resources/rust-server/server-response-body-instance.mustache
index 8af1281efcc6..11753849ca62 100644
--- a/modules/openapi-generator/src/main/resources/rust-server/server-response-body-instance.mustache
+++ b/modules/openapi-generator/src/main/resources/rust-server/server-response-body-instance.mustache
@@ -23,7 +23,7 @@
     {{/x-produces-json}}
     {{#x-produces-bytes}}
                                                     // Binary Body
-                                                    let body = String::from_utf8(body.0).expect("Error converting octet stream to string");
+                                                    *response.body_mut() = BoxBody::new(Full::new(Bytes::from(body.0)));
     {{/x-produces-bytes}}
     {{#x-produces-plain-text}}
                                                     // Plain text Body
@@ -42,7 +42,12 @@
                                                             &["multipart/related; boundary=".as_bytes(), &boundary].concat())
                                                         .expect("Unable to create Content-Type header for multipart/related"));
       {{/formParams}}
+                                                    *response.body_mut() = BoxBody::new(Full::new(Bytes::from(body.0)));
     {{/x-produces-multipart-related}}
-  {{/exts}}
+  {{^x-produces-bytes}}
+  {{^x-produces-multipart-related}}
                                                     *response.body_mut() = body_from_string(body);
+  {{/x-produces-multipart-related}}
+  {{/x-produces-bytes}}
+  {{/exts}}
 {{/dataType}}
diff --git a/samples/server/petstore/rust-server/output/multipart-v3/src/client/mod.rs b/samples/server/petstore/rust-server/output/multipart-v3/src/client/mod.rs
index 2317ae0da1f3..df74eae468a1 100644
--- a/samples/server/petstore/rust-server/output/multipart-v3/src/client/mod.rs
+++ b/samples/server/petstore/rust-server/output/multipart-v3/src/client/mod.rs
@@ -590,7 +590,7 @@ impl<S, C, B> Api<C> for Client<S, C> where
         };
 
         // Consumes multipart/form body
-        let (body_string, multipart_header) = {
+        let (body_bytes, multipart_header) = {
             let mut multipart = Multipart::new();
 
             // For each parameter, encode as appropriate and add to the multipart body as a stream.
@@ -649,9 +649,9 @@ impl<S, C, B> Api<C> for Client<S, C> where
                 Err(err) => return Err(ApiError(format!("Unable to build request: {err}"))),
             };
 
-            let mut body_string = String::new();
+            let mut body_bytes = Vec::new();
 
-            match fields.read_to_string(&mut body_string) {
+            match fields.read_to_end(&mut body_bytes) {
                 Ok(_) => (),
                 Err(err) => return Err(ApiError(format!("Unable to build body: {err}"))),
             }
@@ -660,10 +660,10 @@ impl<S, C, B> Api<C> for Client<S, C> where
 
             let multipart_header = format!("multipart/form-data;boundary={boundary}");
 
-            (body_string, multipart_header)
-        };
+            (body_bytes, multipart_header)
+          };
 
-        *request.body_mut() = body_from_string(body_string);
+        *request.body_mut() = BoxBody::new(Full::new(Bytes::from(body_bytes)));
 
         request.headers_mut().insert(CONTENT_TYPE, match HeaderValue::from_str(&multipart_header) {
             Ok(h) => h,
diff --git a/samples/server/petstore/rust-server/output/openapi-v3/src/server/mod.rs b/samples/server/petstore/rust-server/output/openapi-v3/src/server/mod.rs
index eb2394e91f18..b8866151d91d 100644
--- a/samples/server/petstore/rust-server/output/openapi-v3/src/server/mod.rs
+++ b/samples/server/petstore/rust-server/output/openapi-v3/src/server/mod.rs
@@ -795,8 +795,7 @@ impl<T, C, ReqBody> hyper::service::Service<(Request<ReqBody>, C)> for Service<T
                                                         CONTENT_TYPE,
                                                         HeaderValue::from_static("application/octet-stream"));
                                                     // Binary Body
-                                                    let body = String::from_utf8(body.0).expect("Error converting octet stream to string");
-                                                    *response.body_mut() = body_from_string(body);
+                                                    *response.body_mut() = BoxBody::new(Full::new(Bytes::from(body.0)));
 
                                                 },
                                                 MultigetGetResponse::StringRsp
diff --git a/samples/server/petstore/rust-server/output/petstore-with-fake-endpoints-models-for-testing/src/client/mod.rs b/samples/server/petstore/rust-server/output/petstore-with-fake-endpoints-models-for-testing/src/client/mod.rs
index 27607b69f606..93a264aefb97 100644
--- a/samples/server/petstore/rust-server/output/petstore-with-fake-endpoints-models-for-testing/src/client/mod.rs
+++ b/samples/server/petstore/rust-server/output/petstore-with-fake-endpoints-models-for-testing/src/client/mod.rs
@@ -2650,7 +2650,7 @@ impl<S, C, B> Api<C> for Client<S, C> where
         };
 
         // Consumes multipart/form body
-        let (body_string, multipart_header) = {
+        let (body_bytes, multipart_header) = {
             let mut multipart = Multipart::new();
 
             // For each parameter, encode as appropriate and add to the multipart body as a stream.
@@ -2684,9 +2684,9 @@ impl<S, C, B> Api<C> for Client<S, C> where
                 Err(err) => return Err(ApiError(format!("Unable to build request: {err}"))),
             };
 
-            let mut body_string = String::new();
+            let mut body_bytes = Vec::new();
 
-            match fields.read_to_string(&mut body_string) {
+            match fields.read_to_end(&mut body_bytes) {
                 Ok(_) => (),
                 Err(err) => return Err(ApiError(format!("Unable to build body: {err}"))),
             }
@@ -2695,10 +2695,10 @@ impl<S, C, B> Api<C> for Client<S, C> where
 
             let multipart_header = format!("multipart/form-data;boundary={boundary}");
 
-            (body_string, multipart_header)
-        };
+            (body_bytes, multipart_header)
+          };
 
-        *request.body_mut() = body_from_string(body_string);
+        *request.body_mut() = BoxBody::new(Full::new(Bytes::from(body_bytes)));
 
         request.headers_mut().insert(CONTENT_TYPE, match HeaderValue::from_str(&multipart_header) {
             Ok(h) => h,