diff --git a/container.go b/container.go
index 407d866..aeb8c27 100644
--- a/container.go
+++ b/container.go
@@ -86,7 +86,7 @@ func (r *ContainerService) ListAutoPaging(ctx context.Context, query ContainerLi
 // Delete Container
 func (r *ContainerService) Delete(ctx context.Context, containerID string, opts ...option.RequestOption) (err error) {
 	opts = slices.Concat(r.Options, opts)
-	opts = append([]option.RequestOption{option.WithHeader("Accept", "")}, opts...)
+	opts = append([]option.RequestOption{option.WithHeader("Accept", "*/*")}, opts...)
 	if containerID == "" {
 		err = errors.New("missing required container_id parameter")
 		return
diff --git a/containerfile.go b/containerfile.go
index aa957c8..878cf94 100644
--- a/containerfile.go
+++ b/containerfile.go
@@ -106,7 +106,7 @@ func (r *ContainerFileService) ListAutoPaging(ctx context.Context, containerID s
 // Delete Container File
 func (r *ContainerFileService) Delete(ctx context.Context, containerID string, fileID string, opts ...option.RequestOption) (err error) {
 	opts = slices.Concat(r.Options, opts)
-	opts = append([]option.RequestOption{option.WithHeader("Accept", "")}, opts...)
+	opts = append([]option.RequestOption{option.WithHeader("Accept", "*/*")}, opts...)
 	if containerID == "" {
 		err = errors.New("missing required container_id parameter")
 		return
diff --git a/realtime/call.go b/realtime/call.go
index 0f3bfe2..57e54da 100644
--- a/realtime/call.go
+++ b/realtime/call.go
@@ -40,7 +40,7 @@ func NewCallService(opts ...option.RequestOption) (r CallService) {
 // it.
 func (r *CallService) Accept(ctx context.Context, callID string, body CallAcceptParams, opts ...option.RequestOption) (err error) {
 	opts = slices.Concat(r.Options, opts)
-	opts = append([]option.RequestOption{option.WithHeader("Accept", "")}, opts...)
+	opts = append([]option.RequestOption{option.WithHeader("Accept", "*/*")}, opts...)
 	if callID == "" {
 		err = errors.New("missing required call_id parameter")
 		return
@@ -53,7 +53,7 @@ func (r *CallService) Accept(ctx context.Context, callID string, body CallAccept
 // End an active Realtime API call, whether it was initiated over SIP or WebRTC.
 func (r *CallService) Hangup(ctx context.Context, callID string, opts ...option.RequestOption) (err error) {
 	opts = slices.Concat(r.Options, opts)
-	opts = append([]option.RequestOption{option.WithHeader("Accept", "")}, opts...)
+	opts = append([]option.RequestOption{option.WithHeader("Accept", "*/*")}, opts...)
 	if callID == "" {
 		err = errors.New("missing required call_id parameter")
 		return
@@ -66,7 +66,7 @@ func (r *CallService) Hangup(ctx context.Context, callID string, opts ...option.
 // Transfer an active SIP call to a new destination using the SIP REFER verb.
 func (r *CallService) Refer(ctx context.Context, callID string, body CallReferParams, opts ...option.RequestOption) (err error) {
 	opts = slices.Concat(r.Options, opts)
-	opts = append([]option.RequestOption{option.WithHeader("Accept", "")}, opts...)
+	opts = append([]option.RequestOption{option.WithHeader("Accept", "*/*")}, opts...)
 	if callID == "" {
 		err = errors.New("missing required call_id parameter")
 		return
@@ -79,7 +79,7 @@ func (r *CallService) Refer(ctx context.Context, callID string, body CallReferPa
 // Decline an incoming SIP call by returning a SIP status code to the caller.
 func (r *CallService) Reject(ctx context.Context, callID string, body CallRejectParams, opts ...option.RequestOption) (err error) {
 	opts = slices.Concat(r.Options, opts)
-	opts = append([]option.RequestOption{option.WithHeader("Accept", "")}, opts...)
+	opts = append([]option.RequestOption{option.WithHeader("Accept", "*/*")}, opts...)
 	if callID == "" {
 		err = errors.New("missing required call_id parameter")
 		return
diff --git a/responses/response.go b/responses/response.go
index 3daf5f6..25e1b55 100644
--- a/responses/response.go
+++ b/responses/response.go
@@ -120,7 +120,7 @@ func (r *ResponseService) GetStreaming(ctx context.Context, responseID string, q
 // Deletes a model response with the given ID.
 func (r *ResponseService) Delete(ctx context.Context, responseID string, opts ...option.RequestOption) (err error) {
 	opts = slices.Concat(r.Options, opts)
-	opts = append([]option.RequestOption{option.WithHeader("Accept", "")}, opts...)
+	opts = append([]option.RequestOption{option.WithHeader("Accept", "*/*")}, opts...)
 	if responseID == "" {
 		err = errors.New("missing required response_id parameter")
 		return