Propagate parent trace context

crates/core/src/handlers/oauth2/discovery.rs

@@ -14,6 +14,7 @@
 
 use std::collections::HashSet;
 
+use hyper::Method;
 use oauth2_types::{
     oidc::Metadata,
     pkce::CodeChallengeMethod,
@@ -86,10 +87,15 @@ pub(super) fn filter(
         code_challenge_methods_supported,
     };
 
-    let cors = warp::cors().allow_any_origin();
+    // TODO: get the headers list from the global opentelemetry propagators
+    let cors = warp::cors()
+        .allow_method(Method::GET)
+        .allow_any_origin()
+        .allow_headers(["traceparent"]);
 
-    warp::path!(".well-known" / "openid-configuration")
-        .and(warp::get())
-        .map(move || warp::reply::json(&metadata))
-        .with(cors)
+    warp::path!(".well-known" / "openid-configuration").and(
+        warp::get()
+            .map(move || warp::reply::json(&metadata))
+            .with(cors),
+    )
 }