chore: blocking doesn't need multi-threaded

Author: seanmonstar

Cargo.toml

@@ -43,7 +43,7 @@ rustls-tls-manual-roots = ["__rustls"]
 rustls-tls-webpki-roots = ["webpki-roots", "__rustls"]
 rustls-tls-native-roots = ["rustls-native-certs", "__rustls"]
 
-blocking = ["futures-util/io", "tokio/rt-multi-thread", "tokio/sync"]
+blocking = ["futures-util/io", "tokio/sync"]
 
 cookies = ["cookie_crate", "cookie_store"]
 

src/blocking/client.rs

@@ -1172,7 +1172,7 @@ impl Default for Timeout {
     }
 }
 
-pub(crate) struct KeepCoreThreadAlive(Option<Arc<InnerClientHandle>>);
+pub(crate) struct KeepCoreThreadAlive(#[allow(unused)] Option<Arc<InnerClientHandle>>);
 
 impl KeepCoreThreadAlive {
     pub(crate) fn empty() -> KeepCoreThreadAlive {