Refactor ProxyOverides to be optional

proxy/src/main.rs

@@ -78,12 +78,12 @@ async fn main() -> Result<()> {
         .map_err(|e| anyhow!("could not install crypto provider {e:?}"))?;
 
     let mut client_config = ProxyOverides {
-        proxy_url: match &server_config.proxy_url {
-            Some(url) => Some(url.to_string()),
-            None => None,
-        },
-        cert_hash: None,
-        any_server: false,
+        proxy_url: server_config
+            .proxy_url
+            .as_ref()
+            .map(|url| url.to_string())
+            .unwrap_or_default(),
+        cert_hash: Vec::new(),
     };
 
     let (cert, key) = match (&server_config.cert_path, &server_config.key_path) {
@@ -102,7 +102,7 @@ async fn main() -> Result<()> {
             let cert = cert_params.self_signed(&key_pair)?;
 
             let hash = hmac_sha256::Hash::hash(cert.der().as_ref());
-            client_config.cert_hash = Some(hash.into());
+            client_config.cert_hash = hash.into();
 
             (cert.pem().into(), key_pair.serialize_pem().into())
         }