diff --git a/src/api2/admin/datastore.rs b/src/api2/admin/datastore.rs
index edaf2839..2510b0c0 100644
--- a/src/api2/admin/datastore.rs
+++ b/src/api2/admin/datastore.rs
@@ -9,7 +9,7 @@ use serde_json::{json, Value};
 
 use proxmox::{sortable, identity};
 use proxmox::api::{http_err, list_subdirs_api_method};
-use proxmox::api::{ApiFuture, ApiHandler, ApiMethod, Router, RpcEnvironment, RpcEnvironmentType};
+use proxmox::api::{ApiResponseFuture, ApiHandler, ApiMethod, Router, RpcEnvironment, RpcEnvironmentType};
 use proxmox::api::router::SubdirMap;
 use proxmox::api::schema::*;
 use proxmox::tools::{try_block, fs::file_get_contents, fs::file_set_contents};
@@ -486,7 +486,7 @@ fn download_file(
     param: Value,
     _info: &ApiMethod,
     _rpcenv: Box<dyn RpcEnvironment>,
-) -> ApiFuture {
+) -> ApiResponseFuture {
 
     async move {
         let store = tools::required_string_param(&param, "store")?;
@@ -545,7 +545,7 @@ fn upload_backup_log(
     param: Value,
     _info: &ApiMethod,
     _rpcenv: Box<dyn RpcEnvironment>,
-) -> ApiFuture {
+) -> ApiResponseFuture {
 
     async move {
         let store = tools::required_string_param(&param, "store")?;
diff --git a/src/api2/backup.rs b/src/api2/backup.rs
index 9329e067..894d7c13 100644
--- a/src/api2/backup.rs
+++ b/src/api2/backup.rs
@@ -7,7 +7,7 @@ use serde_json::{json, Value};
 
 use proxmox::{sortable, identity};
 use proxmox::api::list_subdirs_api_method;
-use proxmox::api::{ApiFuture, ApiHandler, ApiMethod, Router, RpcEnvironment};
+use proxmox::api::{ApiResponseFuture, ApiHandler, ApiMethod, Router, RpcEnvironment};
 use proxmox::api::router::SubdirMap;
 use proxmox::api::schema::*;
 
@@ -47,7 +47,7 @@ fn upgrade_to_backup_protocol(
     param: Value,
     _info: &ApiMethod,
     rpcenv: Box<dyn RpcEnvironment>,
-) -> ApiFuture {
+) -> ApiResponseFuture {
 
     async move {
     let debug = param["debug"].as_bool().unwrap_or(false);
@@ -574,7 +574,7 @@ fn dynamic_chunk_index(
     param: Value,
     _info: &ApiMethod,
     rpcenv: Box<dyn RpcEnvironment>,
-) -> ApiFuture {
+) -> ApiResponseFuture {
 
     async move {
         let env: &BackupEnvironment = rpcenv.as_ref();
@@ -649,7 +649,7 @@ fn fixed_chunk_index(
     param: Value,
     _info: &ApiMethod,
     rpcenv: Box<dyn RpcEnvironment>,
-) -> ApiFuture {
+) -> ApiResponseFuture {
 
     async move {
         let env: &BackupEnvironment = rpcenv.as_ref();
diff --git a/src/api2/backup/upload_chunk.rs b/src/api2/backup/upload_chunk.rs
index 3a9577ef..1bc8c7d8 100644
--- a/src/api2/backup/upload_chunk.rs
+++ b/src/api2/backup/upload_chunk.rs
@@ -9,7 +9,7 @@ use hyper::http::request::Parts;
 use serde_json::{json, Value};
 
 use proxmox::{sortable, identity};
-use proxmox::api::{ApiFuture, ApiHandler, ApiMethod, RpcEnvironment};
+use proxmox::api::{ApiResponseFuture, ApiHandler, ApiMethod, RpcEnvironment};
 use proxmox::api::schema::*;
 
 use crate::api2::types::*;
@@ -115,7 +115,7 @@ fn upload_fixed_chunk(
     param: Value,
     _info: &ApiMethod,
     rpcenv: Box<dyn RpcEnvironment>,
-) -> ApiFuture {
+) -> ApiResponseFuture {
 
     async move {
         let wid = tools::required_integer_param(&param, "wid")? as usize;
@@ -173,7 +173,7 @@ fn upload_dynamic_chunk(
     param: Value,
     _info: &ApiMethod,
     rpcenv: Box<dyn RpcEnvironment>,
-) -> ApiFuture {
+) -> ApiResponseFuture {
 
     async move {
         let wid = tools::required_integer_param(&param, "wid")? as usize;
@@ -209,7 +209,7 @@ fn upload_speedtest(
     _param: Value,
     _info: &ApiMethod,
     rpcenv: Box<dyn RpcEnvironment>,
-) -> ApiFuture {
+) -> ApiResponseFuture {
 
     async move {
 
@@ -257,7 +257,7 @@ fn upload_blob(
     param: Value,
     _info: &ApiMethod,
     rpcenv: Box<dyn RpcEnvironment>,
-) -> ApiFuture {
+) -> ApiResponseFuture {
 
     async move {
         let file_name = tools::required_string_param(&param, "file-name")?.to_owned();
diff --git a/src/api2/reader.rs b/src/api2/reader.rs
index 42801526..130fe7ba 100644
--- a/src/api2/reader.rs
+++ b/src/api2/reader.rs
@@ -8,7 +8,7 @@ use serde_json::Value;
 
 use proxmox::{sortable, identity};
 use proxmox::api::http_err;
-use proxmox::api::{ApiFuture, ApiHandler, ApiMethod, Router, RpcEnvironment};
+use proxmox::api::{ApiResponseFuture, ApiHandler, ApiMethod, Router, RpcEnvironment};
 use proxmox::api::schema::*;
 
 use crate::api2::types::*;
@@ -49,7 +49,7 @@ fn upgrade_to_backup_reader_protocol(
     param: Value,
     _info: &ApiMethod,
     rpcenv: Box<dyn RpcEnvironment>,
-) -> ApiFuture {
+) -> ApiResponseFuture {
 
     async move {
         let debug = param["debug"].as_bool().unwrap_or(false);
@@ -172,7 +172,7 @@ fn download_file(
     param: Value,
     _info: &ApiMethod,
     rpcenv: Box<dyn RpcEnvironment>,
-) -> ApiFuture {
+) -> ApiResponseFuture {
 
     async move {
         let env: &ReaderEnvironment = rpcenv.as_ref();
@@ -223,7 +223,7 @@ fn download_chunk(
     param: Value,
     _info: &ApiMethod,
     rpcenv: Box<dyn RpcEnvironment>,
-) -> ApiFuture {
+) -> ApiResponseFuture {
 
     async move {
         let env: &ReaderEnvironment = rpcenv.as_ref();
@@ -258,7 +258,7 @@ fn download_chunk_old(
     param: Value,
     _info: &ApiMethod,
     rpcenv: Box<dyn RpcEnvironment>,
-) -> Result<ApiFuture, Error> {
+) -> Result<ApiResponseFuture, Error> {
 
     let env: &ReaderEnvironment = rpcenv.as_ref();
     let env2 = env.clone();
@@ -303,7 +303,7 @@ fn speedtest(
     _param: Value,
     _info: &ApiMethod,
     _rpcenv: Box<dyn RpcEnvironment>,
-) -> ApiFuture {
+) -> ApiResponseFuture {
 
     let buffer = vec![65u8; 1024*1024]; // nonsense [A,A,A...]
 
diff --git a/src/server/h2service.rs b/src/server/h2service.rs
index cb100fd0..982618d6 100644
--- a/src/server/h2service.rs
+++ b/src/server/h2service.rs
@@ -7,7 +7,7 @@ use std::task::{Context, Poll};
 use futures::*;
 use hyper::{Body, Request, Response, StatusCode};
 
-use proxmox::api::{http_err, ApiFuture, HttpError, Router, RpcEnvironment};
+use proxmox::api::{http_err, ApiResponseFuture, HttpError, Router, RpcEnvironment};
 
 use crate::tools;
 use crate::server::formatter::*;
@@ -35,7 +35,7 @@ impl <E: RpcEnvironment + Clone> H2Service<E> {
         if self.debug { self.worker.log(msg); }
     }
 
-    fn handle_request(&self, req: Request<Body>) -> ApiFuture {
+    fn handle_request(&self, req: Request<Body>) -> ApiResponseFuture {
 
         let (parts, body) = req.into_parts();
 
diff --git a/src/server/rest.rs b/src/server/rest.rs
index 119883f1..8d82f855 100644
--- a/src/server/rest.rs
+++ b/src/server/rest.rs
@@ -285,6 +285,12 @@ pub async fn handle_api_request<Env: RpcEnvironment, S: 'static + BuildHasher +
             (handler)(params, info, &mut rpcenv)
                 .map(|data| (formatter.format_data)(data, &rpcenv))
         }
+        ApiHandler::Async(handler) => {
+            let params = get_request_parameters(info.parameters, parts, req_body, uri_param).await?;
+            (handler)(params, info, &mut rpcenv)
+                .await
+                .map(|data| (formatter.format_data)(data, &rpcenv))
+        }
     };
 
     let resp = match result {