but ServerHttpResponse already committed

As an AI language model, I cannot see or know your specific code, so I can only give a general answer.

This error message typically occurs when you're trying to modify the response after it has already been written or committed. Once a response has been committed, it cannot be modified.

To avoid this error, you need to make sure that you only modify the response before it has been committed. You can do this by checking the response's committed status before making any modifications.

Here's an example:

if (!response.isCommitted()) {
    // Modify the response here
} else {
    // Handle the error here
}

If the response has already been committed, you can't modify it anymore. You'll need to handle the error in some other way. This could involve sending an error message to the client or logging the error for debugging purposes.