Missing "Content-Length" from worker response

I'm setting a response with these headers:
const corsHeaders = new Headers({ 'Access-Control-Allow-Origin': '*', 'Access-Control-Allow-Methods': 'GET, POST, OPTIONS', 'Access-Control-Allow-Headers': 'Authorization, Content-Type', 'Content-Type': 'application/json', });
But I get responses without "Content-Length". do I have to add it manually? is the existence of 'Content-Type': 'application/json' make it so the length isn't added?
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