add feature for clients that do not implement send

Cargo.toml

@@ -40,6 +40,7 @@ wasm-bindgen-futures = "0.4"
 [features]
 default = ["reqwest"]
 reqwest = ["dep:reqwest", "pin-project-lite", "bytes"]
+futures-unsend = []
 
 [dev-dependencies]
 futures-await-test = "0.3"

examples/cli-app-with-awc/Cargo.toml

@@ -7,7 +7,7 @@ publish = false
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-meilisearch-sdk = { path = "../..", default-features = false }
+meilisearch-sdk = { path = "../..", default-features = false, features = ["futures-unsend"] }
 futures = "0.3"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"

src/request.rs

@@ -65,7 +65,8 @@ impl<Q, B> Method<Q, B> {
     }
 }
 
-#[async_trait(?Send)]
+#[cfg_attr(feature = "futures-unsend", async_trait(?Send))]
+#[cfg_attr(not(feature = "futures-unsend"), async_trait)]
 pub trait HttpClient: Clone + Send + Sync {
     async fn request<Query, Body, Output>(
         &self,
@@ -143,7 +144,8 @@ pub fn parse_response<Output: DeserializeOwned>(
     }
 }
 
-#[async_trait(?Send)]
+#[cfg_attr(feature = "futures-unsend", async_trait(?Send))]
+#[cfg_attr(not(feature = "futures-unsend"), async_trait)]
 impl HttpClient for Infallible {
     async fn request<Query, Body, Output>(
         &self,

src/reqwest.rs

@@ -50,7 +50,8 @@ impl ReqwestClient {
     }
 }
 
-#[async_trait(?Send)]
+#[cfg_attr(feature = "futures-unsend", async_trait(?Send))]
+#[cfg_attr(not(feature = "futures-unsend"), async_trait)]
 impl HttpClient for ReqwestClient {
     async fn stream_request<
         Query: Serialize + Send + Sync,