Assume Content-Type is json for endpoints that require json (#4575)

* added default content type filter

* Merge branch 'unstable' of https://github.com/sigp/lighthouse into unstable

* create custom warp json filter that ignores content type header

* cargo fmt and linting

* updated test

* updated test

* merge unstable

* merge conflicts

* workspace=true

* use Bytes instead of Buf

* resolve merge conflict

* resolve merge conflicts

* add extra error message context

* merge conflicts

* lint

common/warp_utils/src/reject.rs

@@ -82,6 +82,15 @@ pub fn custom_bad_request(msg: String) -> warp::reject::Rejection {
     warp::reject::custom(CustomBadRequest(msg))
 }
 
+#[derive(Debug)]
+pub struct CustomDeserializeError(pub String);
+
+impl Reject for CustomDeserializeError {}
+
+pub fn custom_deserialize_error(msg: String) -> warp::reject::Rejection {
+    warp::reject::custom(CustomDeserializeError(msg))
+}
+
 #[derive(Debug)]
 pub struct CustomServerError(pub String);
 
@@ -161,6 +170,9 @@ pub async fn handle_rejection(err: warp::Rejection) -> Result<impl warp::Reply,
     if err.is_not_found() {
         code = StatusCode::NOT_FOUND;
         message = "NOT_FOUND".to_string();
+    } else if let Some(e) = err.find::<crate::reject::CustomDeserializeError>() {
+        message = format!("BAD_REQUEST: body deserialize error: {}", e.0);
+        code = StatusCode::BAD_REQUEST;
     } else if let Some(e) = err.find::<warp::filters::body::BodyDeserializeError>() {
         message = format!("BAD_REQUEST: body deserialize error: {}", e);
         code = StatusCode::BAD_REQUEST;